A [fantastical-costumehero-altconstruction-premodernverse] (This is roughly a mix of Magical Girl and Urban Fantasy genres, but it usually isn't set in the Tessaverse itself) derivative novel with the worldbuilding premise that magical power is not native to humans, but can be obtained by magicals via carefully devised contracts with an ambiguously independent collective from another planet with a name that roughly translates as "the observers." The footnotes suggest this is explored in the parent setting in greater detail, but this one only concerns itself with providing a surface level explanation of how a poorly specified contract can result in you not getting what you wanted out of it and wasting your payment, or a well designed one allowing you to obtain abilities that would ordinarily be far more expensive. The story is in the third person perspective and follows two protagonists.

The protagonist, Momo, is a kind and friendly woman who obtained a sufficiently well specified object repair power that she can also use it as an anomalously broad and capable healing power. Her arcs follow her trying to balance her contracted responsibilities with her work to help people and her own personal life. Primarily, the last the form of dealing with her increasing distance from her prior acquaintances, as well as a newly expanded magical social circle, which includes an alluring but guarded magical of ambiguous gender she finds herself drawn to despite the negative rumors. At the beginning, this ability is presented as unambiguously positive in impact, and includes an examination of the idea of what it means to be good and what their obligations towards society are by the Momo and her best friend, who has their own, less versatile contracted powers. As time passes, however, Momo is forced to deal with steadily more problems, starting with becoming the target of anger from people she didn't save. From there, things escalate, with her and her group coming under physical and social attack by entrenched interests, people looking to monopolize her power, and people hostile to those she has already helped. With the result of careful planning, quick thinking, and a healthy heaping of luck, she is able to survive and maintain her freedom, but the task grows steadily harder.

The deuteragonist's perspective picks up at their meeting with the protagonist, who they seem to recognize on sight. The viewpoint character for these segments is an extremely capable and [graceful-efficient] magical named Jix as they work to pursue their own agenda, which appears to be quietly dominating the local underground and magical scenes. They deal with roadblocks by whatever means necessary, including a great deal of intimidation and violence, but is careful never to leave anything that can be traced to them. Along the way they demonstrate keen foresight and competence in dealing with various plots, ambushes, and manipulations before striking at those who attack them. Outside of their work, they work their way into the friend group of the protagonist. They are openly polite and friendly, if not especially approachable, but in private seems dismissive about any of them besides the protagonist herself. As the story progresses, it becomes clear that more and more of their actions are targeted at people and groups Momo associates with, which leaves the impression that they too wants to take the protagonist for their own.

Things come to a head when one of the strongest local power blocks manages to ambush the protagonist, badly injuring her best friend in the process, only for Jix to spring a second ambush and take them down herself. Rather than capture her in turn, however, Jix instead swear themselves to the protagonist's cause, and reveals that their own power is the ability to turn back time. The first time through, they had been saved by the Momo in their darkest moment, but when she was defeated and killed, they altered the wording of the same restoration contract the protagonist had made so they could reset the entire universe. From there, the two perspectives track closely together as their relationship evolves, with Momo learning to enjoy exercising power over Jix inside and outside of the bedroom. The book makes use of magic healing to justify otherwise-inadvisable sex acts, which it’s made clear Jix would ordinarily dislike but adores because of the person doing it. Alongside the steamy scenes, the plot escalates, with the deuteragonist going to further and further extremes to take out things they feel are a danger to the protagonist, up to and including several cases of murder. This comes to a head when the protagonist catches them during the act and confronts them, which results in an impassioned scene where the deuteragonist pleads with the protagonist to let them succeed in keeping her safe, just once. This resolves with the protagonist agreeing to be more selfish, but ordering Jix to not act out without her permission, and proceeds to a punishment scene that makes it clear (if the rest of the book didn't) that this is this particular author's kink. The story wraps up after a short timeskip with the Jix heading out on a mission of dubious providence, but in clothing that is obviously (to a tessaverse resident) sub fetishwear.

The protagonist is a male mage who starts off the story having just completed the design of a theoretical summoning spell to cross universal boundaries, which is thought to be impossible; the way they got around it was by summoning an alternate version of themselves, who was building the same scaffold at their end, which halved the required complexity. This alternate version is a girl, and after some conversation to confirm their own identities, they proceed to have sex. After that, they put into motion a plan to take over the planet they're on. Their ability to work together and look out for each others interests allows them to take down their neighbors and start to put together a top down command society. At various points, their expansion efforts are stymied by opposition, who they proceed to defeat; these takedowns are split about half and half with clever strategy and half with seduction, where one of them willingly puts themselves at the mercy of their opponent to be taken as a sex slave so as to distract them while the other one acts. There is some justification given about how this is the natural state of the given alien-social sex equilibrium given how any other kind of sex would be making yourself vulnerable to someone you don't trust, but it isn't especially rigorous. These scenes contain a lot of sadism, noncon, torture, etc, with the goal of breaking their will; once their will is broken, they won't be an especially effective worker at anything besides manual labor and sex, but they won't have the capacity to strike back. These scenes come from a perspective that implies "clearly these are bad but isn't it hot though." After the opponent in question is defeated, there is usually a role-reversal scene where the protagonists are instead the ones in control and succeed in breaking down the perpetrator, either alone or together. As the population under their control increases, this is interspersed with scenes of them working together and directing laborers to construct roads, aquaducts, mills, and the like.

The final obstacle is an extremely capable mage who controls the closest thing their is to civilization outside of their works. He had mastered particularly powerful ways of breaking people's wills with rape. In one of the most elaborate sex scenes in the book, the mage rapes the summoner until he breaks, and then turns him on his compatriot. However, when he brings her back in chains, it is revealed to be a ruse, and they take him down in his moment of triumph. The story then jumps back in time two weeks, to where the summoned protagonist saw this coming and turned on their alternate self, attacking them by surprise. The summoner is revealed to have been working on their own plans to do the same, but was caught by surprise and defeated. He tries several times to reverse the situation after being captured, but is forced to concede. Defeated, he goes along with her as she breaks down and rebuilds his mind, keeping much of the same personality but subservient to her. They had realized what made normal people ineffective once defeated was that they only valued themselves, so they fought to prevent it with all their might, but when that self interest was broken, they didn't have anything else. By getting him to give in and work with her, she didn't have to damage that bit, allowing him to retain the capability for independent action. The mage's attempts to break him were doomed to failure, because he already had a master. It then spends the remaining chapters on detailing all the various things she changed about him and some kinky sex, before ending on a scene of them preparing another summoning spell.

In the third novel, a student named Violet is isekaid to the Tessaverse’s past, where she finds herself hundreds of years ago in the city that would later form the nucleus of the Tessaverse. Upon realizing this, she makes a name for herself in the field of mathematics. The story goes into great detail on the subject from first principles, but the Tessa largely seems to focus on creating a coherent basis for mathematics rather than redevelop specific new techniques; the impression given is that the author believes this is obviously the most important part of math. One of these achievements, the cubic and quartic formulas, catches the attention of a famous polymath in a neighboring country named Elle. In proper history, this woman had revolutionized a dozen branches of mathematics and science but had always despaired of the fact that nobody could keep up with her, and ended up with most of her work unpublished for decades after she died young from disease. Violet already has something of a crush on Elle, but experiences severe imposter syndrome due to feeling like she was being given credit she didn’t deserve; her publications had been based on the work of others, including Elle herself. From there, the story covers the protagonist’s struggle between being seduced by Elle and her attempts to grapple with the false impression she has created, which is made all the worse as her love interest steps up her own efforts in an attempt to keep up.

Alongside the romance comes a series of mathematical developments, each shown and proven in the pages of the work. Despite her guilt, Violet increases their own work rate in an attempt to put off disappointing Elle, which culminates in her releasing a proof for the fundemental theorem of Calculus just ahead of Elle’s own work. At this, Elle asks Violet out, at which point she spills the beans, confessing her secret. Rather than reject her, however, Elle remarks that this just means that the protagonist knows even more things that she doesn’t, and declares her intention of getting them out of her before silencing her with a kiss. A short sex scene follows soon after, but it’s clearly a lot more vanilla than the previous works and is not the focus of the book. Checking the documentation will reveal that they were delighted to hear that Abrogail was interested in mathematical uplift, which is a popular Tessaverse genre that they haven’t seen much of in any of the other worlds they’re receiving fiction from. Supposedly this is one of the most popular examples of the [mathematical-romance] genre in the Tessaverse, but they apologize if it wasn’t technical enough for her taste because they know some people have high standards on that score (The book is, by the by, over half mathematics, history of mathematics, and philosophy of mathematics by volume). That this might be a miscommunication does not appear evident in their commentary.

A [fantastical-costumehero-altconstruction-premodernverse] (This is roughly a mix of Magical Girl and Urban Fantasy genres, but it usually isn't set in the Tessaverse itself) derivative novel with the worldbuilding premise that magical power is not native to humans, but can be obtained by magicals via carefully devised contracts with an ambiguously independent collective from another planet with a name that roughly translates as "the observers." The footnotes suggest this is explored in the parent setting in greater detail, but this one only concerns itself with providing a surface level explanation of how a poorly specified contract can result in you not getting what you wanted out of it and wasting your payment, or a well designed one allowing you to obtain abilities that would ordinarily be far more expensive. The story is in the third person perspective and follows two protagonists.

The protagonist, Momo, is a kind and friendly woman who obtained a sufficiently well specified object repair power that she can also use it as an anomalously broad and capable healing power. Her arcs follow her trying to balance her contracted responsibilities with her work to help people and her own personal life. Primarily, the last the form of dealing with her increasing distance from her prior acquaintances, as well as a newly expanded magical social circle, which includes an alluring but guarded magical of ambiguous gender she finds herself drawn to despite the negative rumors. At the beginning, this ability is presented as unambiguously positive in impact, and includes an examination of the idea of what it means to be good and what their obligations towards society are by the Momo and her best friend, who has their own, less versatile contracted powers. As time passes, however, Momo is forced to deal with steadily more problems, starting with becoming the target of anger from people she didn't save. From there, things escalate, with her and her group coming under physical and social attack by entrenched interests, people looking to monopolize her power, and people hostile to those she has already helped. With the result of careful planning, quick thinking, and a healthy heaping of luck, she is able to survive and maintain her freedom, but the task grows steadily harder.

The deuteragonist's perspective picks up at their meeting with the protagonist, who they seem to recognize on sight. The viewpoint character for these segments is an extremely capable and [graceful-efficient] magical named Jix as they work to pursue their own agenda, which appears to be quietly dominating the local underground and magical scenes. They deal with roadblocks by whatever means necessary, including a great deal of intimidation and violence, but is careful never to leave anything that can be traced to them. Along the way they demonstrate keen foresight and competence in dealing with various plots, ambushes, and manipulations before striking at those who attack them. Outside of their work, they work their way into the friend group of the protagonist. They are openly polite and friendly, if not especially approachable, but in private seems dismissive about any of them besides the protagonist herself. As the story progresses, it becomes clear that more and more of their actions are targeted at people and groups Momo associates with, which leaves the impression that they too wants to take the protagonist for their own.

Things come to a head when one of the strongest local power blocks manages to ambush the protagonist, badly injuring her best friend in the process, only for Jix to spring a second ambush and take them down herself. Rather than capture her in turn, however, Jix instead swear themselves to the protagonist's cause, and reveals that their own power is the ability to turn back time. The first time through, they had been saved by the Momo in their darkest moment, but when she was defeated and killed, they altered the wording of the same restoration contract the protagonist had made so they could reset the entire universe. From there, the two perspectives track closely together as their relationship evolves, with Momo learning to enjoy exercising power over Jix inside and outside of the bedroom. The book makes use of magic healing to justify otherwise-inadvisable sex acts, which it’s made clear Jix would ordinarily dislike but adores because of the person doing it. Alongside the steamy scenes, the plot escalates, with the deuteragonist going to further and further extremes to take out things they feel are a danger to the protagonist, up to and including several cases of murder. This comes to a head when the protagonist catches them during the act and confronts them, which results in an impassioned scene where the deuteragonist pleads with the protagonist to let them succeed in keeping her safe, just once. This resolves with the protagonist agreeing to be more selfish, but ordering Jix to not act out without her permission, and proceeds to a punishment scene that makes it clear (if the rest of the book didn't) that this is this particular author's kink. The story wraps up after a short timeskip with the Jix heading out on a mission of dubious providence, but in clothing that is obviously (to a tessaverse resident) sub fetishwear.

The protagonist is a male mage who starts off the story having just completed the design of a theoretical summoning spell to cross universal boundaries, which is thought to be impossible; the way they got around it was by summoning an alternate version of themselves, who was building the same scaffold at their end, which halved the required complexity. This alternate version is a girl, and after some conversation to confirm their own identities, they proceed to have sex. After that, they put into motion a plan to take over the planet they're on. Their ability to work together and look out for each others interests allows them to take down their neighbors and start to put together a top down command society. At various points, their expansion efforts are stymied by opposition, who they proceed to defeat; these takedowns are split about half and half with clever strategy and half with seduction, where one of them willingly puts themselves at the mercy of their opponent to be taken as a sex slave so as to distract them while the other one acts. There is some justification given about how this is the natural state of the given alien-social sex equilibrium given how any other kind of sex would be making yourself vulnerable to someone you don't trust, but it isn't especially rigorous. These scenes contain a lot of sadism, noncon, torture, etc, with the goal of breaking their will; once their will is broken, they won't be an especially effective worker at anything besides manual labor and sex, but they won't have the capacity to strike back. These scenes come from a perspective that implies "clearly these are bad but isn't it hot though." After the opponent in question is defeated, there is usually a role-reversal scene where the protagonists are instead the ones in control and succeed in breaking down the perpetrator, either alone or together. As the population under their control increases, this is interspersed with scenes of them working together and directing laborers to construct roads, aquaducts, mills, and the like.

The final obstacle is an extremely capable mage who controls the closest thing their is to civilization outside of their works. He had mastered particularly powerful ways of breaking people's wills with rape. In one of the most elaborate sex scenes in the book, the mage rapes the summoner until he breaks, and then turns him on his compatriot. However, when he brings her back in chains, it is revealed to be a ruse, and they take him down in his moment of triumph. The story then jumps back in time two weeks, to where the summoned protagonist saw this coming and turned on their alternate self, attacking them by surprise. The summoner is revealed to have been working on their own plans to do the same, but was caught by surprise and defeated. He tries several times to reverse the situation after being captured, but is forced to concede. Defeated, he goes along with her as she breaks down and rebuilds his mind, keeping much of the same personality but subservient to her. They had realized what made normal people ineffective once defeated was that they only valued themselves, so they fought to prevent it with all their might, but when that self interest was broken, they didn't have anything else. By getting him to give in and work with her, she didn't have to damage that bit, allowing him to retain the capability for independent action. The mage's attempts to break him were doomed to failure, because he already had a master. It then spends the remaining chapters on detailing all the various things she changed about him and some kinky sex, before ending on a scene of them preparing another summoning spell.

In the third novel, a student named Violet is isekaid to the Tessaverse’s past, where she finds herself hundreds of years ago in the city that would later form the nucleus of the Tessaverse. Upon realizing this, she makes a name for herself in the field of mathematics. The story goes into great detail on the subject from first principles, but the Tessa largely seems to focus on creating a coherent basis for mathematics rather than redevelop specific new techniques; the impression given is that the author believes this is obviously the most important part of math. One of these achievements, the cubic and quartic formulas, catches the attention of a famous polymath in a neighboring country named Elle. In proper history, this woman had revolutionized a dozen branches of mathematics and science but had always despaired of the fact that nobody could keep up with her, and ended up with most of her work unpublished for decades after she died young from disease. Violet already has something of a crush on Elle, but experiences severe imposter syndrome due to feeling like she was being given credit she didn’t deserve; her publications had been based on the work of others, including Elle herself. From there, the story covers the protagonist’s struggle between being seduced by Elle and her attempts to grapple with the false impression she has created, which is made all the worse as her love interest steps up her own efforts in an attempt to keep up.

Alongside the romance comes a series of mathematical developments, each shown and proven in the pages of the work. Despite her guilt, Violet increases their own work rate in an attempt to put off disappointing Elle, which culminates in her releasing a proof for the fundemental theorem of Calculus just ahead of Elle’s own work. At this, Elle asks Violet out, at which point she spills the beans, confessing her secret. Rather than reject her, however, Elle remarks that this just means that the protagonist knows even more things that she doesn’t, and declares her intention of getting them out of her before silencing her with a kiss. A short sex scene follows soon after, but it’s clearly a lot more vanilla than the previous works and is not the focus of the book. Checking the documentation will reveal that they were delighted to hear that Abrogail was interested in mathematical uplift, which is a popular Tessaverse genre that they haven’t seen much of in any of the other worlds they’re receiving fiction from. Supposedly this is one of the most popular examples of the [mathematical-romance] genre in the Tessaverse, but they apologize if it wasn’t technical enough for her taste because they know some people have high standards on that score (The book is, by the by, over half mathematics, history of mathematics, and philosophy of mathematics by volume). That this might be a miscommunication does not appear evident in their commentary.

A [fantastical-costumehero-altconstruction-premodernverse] (This is roughly a mix of Magical Girl and Urban Fantasy genres, but it usually isn't set in the Tessaverse itself) derivative novel with the worldbuilding premise that magical power is not native to humans, but can be obtained by magicals via carefully devised contracts with an ambiguously independent collective from another planet with a name that roughly translates as "the observers." The footnotes suggest this is explored in the parent setting in greater detail, but this one only concerns itself with providing a surface level explanation of how a poorly specified contract can result in you not getting what you wanted out of it and wasting your payment, or a well designed one allowing you to obtain abilities that would ordinarily be far more expensive. The story is in the third person perspective and follows two protagonists.

The protagonist, Momo, is a kind and friendly woman who obtained a sufficiently well specified object repair power that she can also use it as an anomalously broad and capable healing power. Her arcs follow her trying to balance her contracted responsibilities with her work to help people and her own personal life. Primarily, the last the form of dealing with her increasing distance from her prior acquaintances, as well as a newly expanded magical social circle, which includes an alluring but guarded magical of ambiguous gender she finds herself drawn to despite the negative rumors. At the beginning, this ability is presented as unambiguously positive in impact, and includes an examination of the idea of what it means to be good and what their obligations towards society are by the Momo and her best friend, who has their own, less versatile contracted powers. As time passes, however, Momo is forced to deal with steadily more problems, starting with becoming the target of anger from people she didn't save. From there, things escalate, with her and her group coming under physical and social attack by entrenched interests, people looking to monopolize her power, and people hostile to those she has already helped. With the result of careful planning, quick thinking, and a healthy heaping of luck, she is able to survive and maintain her freedom, but the task grows steadily harder.

The deuteragonist's perspective picks up at their meeting with the protagonist, who they seem to recognize on sight. The viewpoint character for these segments is an extremely capable and [graceful-efficient] magical named Jix as they work to pursue their own agenda, which appears to be quietly dominating the local underground and magical scenes. They deal with roadblocks by whatever means necessary, including a great deal of intimidation and violence, but is careful never to leave anything that can be traced to them. Along the way they demonstrate keen foresight and competence in dealing with various plots, ambushes, and manipulations before striking at those who attack them. Outside of their work, they work their way into the friend group of the protagonist. They are openly polite and friendly, if not especially approachable, but in private seems dismissive about any of them besides the protagonist herself. As the story progresses, it becomes clear that more and more of their actions are targeted at people and groups Momo associates with, which leaves the impression that they too wants to take the protagonist for their own.

Things come to a head when one of the strongest local power blocks manages to ambush the protagonist, badly injuring her best friend in the process, only for Jix to spring a second ambush and take them down herself. Rather than capture her in turn, however, Jix instead swear themselves to the protagonist's cause, and reveals that their own power is the ability to turn back time. The first time through, they had been saved by the Momo in their darkest moment, but when she was defeated and killed, they altered the wording of the same restoration contract the protagonist had made so they could reset the entire universe. From there, the two perspectives track closely together as their relationship evolves, with Momo learning to enjoy exercising power over Jix inside and outside of the bedroom. The book makes use of magic healing to justify otherwise-inadvisable sex acts, which it’s made clear Jix would ordinarily dislike but adores because of the person doing it. Alongside the steamy scenes, the plot escalates, with the deuteragonist going to further and further extremes to take out things they feel are a danger to the protagonist, up to and including several cases of murder. This comes to a head when the protagonist catches them during the act and confronts them, which results in an impassioned scene where the deuteragonist pleads with the protagonist to let them succeed in keeping her safe, just once. This resolves with the protagonist agreeing to be more selfish, but ordering Jix to not act out without her permission, and proceeds to a punishment scene that makes it clear (if the rest of the book didn't) that this is this particular author's kink. The story wraps up after a short timeskip with the Jix heading out on a mission of dubious providence, but in clothing that is obviously (to a tessaverse resident) sub fetishwear.

The protagonist is a male mage who starts off the story having just completed the design of a theoretical summoning spell to cross universal boundaries, which is thought to be impossible; the way they got around it was by summoning an alternate version of themselves, who was building the same scaffold at their end, which halved the required complexity. This alternate version is a girl, and after some conversation to confirm their own identities, they proceed to have sex. After that, they put into motion a plan to take over the planet they're on. Their ability to work together and look out for each others interests allows them to take down their neighbors and start to put together a top down command society. At various points, their expansion efforts are stymied by opposition, who they proceed to defeat; these takedowns are split about half and half with clever strategy and half with seduction, where one of them willingly puts themselves at the mercy of their opponent to be taken as a sex slave so as to distract them while the other one acts. There is some justification given about how this is the natural state of the given alien-social sex equilibrium given how any other kind of sex would be making yourself vulnerable to someone you don't trust, but it isn't especially rigorous. These scenes contain a lot of sadism, noncon, torture, etc, with the goal of breaking their will; once their will is broken, they won't be an especially effective worker at anything besides manual labor and sex, but they won't have the capacity to strike back. These scenes come from a perspective that implies "clearly these are bad but isn't it hot though." After the opponent in question is defeated, there is usually a role-reversal scene where the protagonists are instead the ones in control and succeed in breaking down the perpetrator, either alone or together. As the population under their control increases, this is interspersed with scenes of them working together and directing laborers to construct roads, aquaducts, mills, and the like.

The final obstacle is an extremely capable mage who controls the closest thing their is to civilization outside of their works. He had mastered particularly powerful ways of breaking people's wills with rape. In one of the most elaborate sex scenes in the book, the mage rapes the summoner until he breaks, and then turns him on his compatriot. However, when he brings her back in chains, it is revealed to be a ruse, and they take him down in his moment of triumph. The story then jumps back in time two weeks, to where the summoned protagonist saw this coming and turned on their alternate self, attacking them by surprise. The summoner is revealed to have been working on their own plans to do the same, but was caught by surprise and defeated. He tries several times to reverse the situation after being captured, but is forced to concede. Defeated, he goes along with her as she breaks down and rebuilds his mind, keeping much of the same personality but subservient to her. They had realized what made normal people ineffective once defeated was that they only valued themselves, so they fought to prevent it with all their might, but when that self interest was broken, they didn't have anything else. By getting him to give in and work with her, she didn't have to damage that bit, allowing him to retain the capability for independent action. The mage's attempts to break him were doomed to failure, because he already had a master. It then spends the remaining chapters on detailing all the various things she changed about him and some kinky sex, before ending on a scene of them preparing another summoning spell.

In the third novel, a student named Violet is isekaid to the Tessaverse’s past, where she finds herself hundreds of years ago in the city that would later form the nucleus of the Tessaverse. Upon realizing this, she makes a name for herself in the field of mathematics. The story goes into great detail on the subject from first principles, but the Tessa largely seems to focus on creating a coherent basis for mathematics rather than redevelop specific new techniques; the impression given is that the author believes this is obviously the most important part of math. One of these achievements, the cubic and quartic formulas, catches the attention of a famous polymath in a neighboring country named Elle. In proper history, this woman had revolutionized a dozen branches of mathematics and science but had always despaired of the fact that nobody could keep up with her, and ended up with most of her work unpublished for decades after she died young from disease. Violet already has something of a crush on Elle, but experiences severe imposter syndrome due to feeling like she was being given credit she didn’t deserve; her publications had been based on the work of others, including Elle herself. From there, the story covers the protagonist’s struggle between being seduced by Elle and her attempts to grapple with the false impression she has created, which is made all the worse as her love interest steps up her own efforts in an attempt to keep up.

Alongside the romance comes a series of mathematical developments, each shown and proven in the pages of the work. Despite her guilt, Violet increases their own work rate in an attempt to put off disappointing Elle, which culminates in her releasing a proof for the fundemental theorem of Calculus just ahead of Elle’s own work. At this, Elle asks Violet out, at which point she spills the beans, confessing her secret. Rather than reject her, however, Elle remarks that this just means that the protagonist knows even more things that she doesn’t, and declares her intention of getting them out of her before silencing her with a kiss. A short sex scene follows soon after, but it’s clearly a lot more vanilla than the previous works and is not the focus of the book. Checking the documentation will reveal that they were delighted to hear that Abrogail was interested in mathematical uplift, which is a popular Tessaverse genre that they haven’t seen much of in any of the other worlds they’re receiving fiction from. Supposedly this is one of the most popular examples of the [mathematical-romance] genre in the Tessaverse, but they apologize if it wasn’t technical enough for her taste because they know some people have high standards on that score (The book is, by the by, over half mathematics, history of mathematics, and philosophy of mathematics by volume). That this might be a miscommunication does not appear evident in their commentary.

A [fantastical-costumehero-altconstruction-premodernverse] (This is roughly a mix of Magical Girl and Urban Fantasy genres, but it usually isn't set in the Tessaverse itself) derivative novel with the worldbuilding premise that magical power is not native to humans, but can be obtained by magicals via carefully devised contracts with an ambiguously independent collective from another planet with a name that roughly translates as "the observers." The footnotes suggest this is explored in the parent setting in greater detail, but this one only concerns itself with providing a surface level explanation of how a poorly specified contract can result in you not getting what you wanted out of it and wasting your payment, or a well designed one allowing you to obtain abilities that would ordinarily be far more expensive. The story is in the third person perspective and follows two protagonists.

The protagonist, Momo, is a kind and friendly woman who obtained a sufficiently well specified object repair power that she can also use it as an anomalously broad and capable healing power. Her arcs follow her trying to balance her contracted responsibilities with her work to help people and her own personal life. Primarily, the last the form of dealing with her increasing distance from her prior acquaintances, as well as a newly expanded magical social circle, which includes an alluring but guarded magical of ambiguous gender she finds herself drawn to despite the negative rumors. At the beginning, this ability is presented as unambiguously positive in impact, and includes an examination of the idea of what it means to be good and what their obligations towards society are by the Momo and her best friend, who has their own, less versatile contracted powers. As time passes, however, Momo is forced to deal with steadily more problems, starting with becoming the target of anger from people she didn't save. From there, things escalate, with her and her group coming under physical and social attack by entrenched interests, people looking to monopolize her power, and people hostile to those she has already helped. With the result of careful planning, quick thinking, and a healthy heaping of luck, she is able to survive and maintain her freedom, but the task grows steadily harder.

The deuteragonist's perspective picks up at their meeting with the protagonist, who they seem to recognize on sight. The viewpoint character for these segments is an extremely capable and [graceful-efficient] magical named Jix as they work to pursue their own agenda, which appears to be quietly dominating the local underground and magical scenes. They deal with roadblocks by whatever means necessary, including a great deal of intimidation and violence, but is careful never to leave anything that can be traced to them. Along the way they demonstrate keen foresight and competence in dealing with various plots, ambushes, and manipulations before striking at those who attack them. Outside of their work, they work their way into the friend group of the protagonist. They are openly polite and friendly, if not especially approachable, but in private seems dismissive about any of them besides the protagonist herself. As the story progresses, it becomes clear that more and more of their actions are targeted at people and groups Momo associates with, which leaves the impression that they too wants to take the protagonist for their own.

Things come to a head when one of the strongest local power blocks manages to ambush the protagonist, badly injuring her best friend in the process, only for Jix to spring a second ambush and take them down herself. Rather than capture her in turn, however, Jix instead swear themselves to the protagonist's cause, and reveals that their own power is the ability to turn back time. The first time through, they had been saved by the Momo in their darkest moment, but when she was defeated and killed, they altered the wording of the same restoration contract the protagonist had made so they could reset the entire universe. From there, the two perspectives track closely together as their relationship evolves, with Momo learning to enjoy exercising power over Jix inside and outside of the bedroom. The book makes use of magic healing to justify otherwise-inadvisable sex acts, which it’s made clear Jix would ordinarily dislike but adores because of the person doing it. Alongside the steamy scenes, the plot escalates, with the deuteragonist going to further and further extremes to take out things they feel are a danger to the protagonist, up to and including several cases of murder. This comes to a head when the protagonist catches them during the act and confronts them, which results in an impassioned scene where the deuteragonist pleads with the protagonist to let them succeed in keeping her safe, just once. This resolves with the protagonist agreeing to be more selfish, but ordering Jix to not act out without her permission, and proceeds to a punishment scene that makes it clear (if the rest of the book didn't) that this is this particular author's kink. The story wraps up after a short timeskip with the Jix heading out on a mission of dubious providence, but in clothing that is obviously (to a tessaverse resident) sub fetishwear.

The protagonist is a male mage who starts off the story having just completed the design of a theoretical summoning spell to cross universal boundaries, which is thought to be impossible; the way they got around it was by summoning an alternate version of themselves, who was building the same scaffold at their end, which halved the required complexity. This alternate version is a girl, and after some conversation to confirm their own identities, they proceed to have sex. After that, they put into motion a plan to take over the planet they're on. Their ability to work together and look out for each others interests allows them to take down their neighbors and start to put together a top down command society. At various points, their expansion efforts are stymied by opposition, who they proceed to defeat; these takedowns are split about half and half with clever strategy and half with seduction, where one of them willingly puts themselves at the mercy of their opponent to be taken as a sex slave so as to distract them while the other one acts. There is some justification given about how this is the natural state of the given alien-social sex equilibrium given how any other kind of sex would be making yourself vulnerable to someone you don't trust, but it isn't especially rigorous. These scenes contain a lot of sadism, noncon, torture, etc, with the goal of breaking their will; once their will is broken, they won't be an especially effective worker at anything besides manual labor and sex, but they won't have the capacity to strike back. These scenes come from a perspective that implies "clearly these are bad but isn't it hot though." After the opponent in question is defeated, there is usually a role-reversal scene where the protagonists are instead the ones in control and succeed in breaking down the perpetrator, either alone or together. As the population under their control increases, this is interspersed with scenes of them working together and directing laborers to construct roads, aquaducts, mills, and the like.

The final obstacle is an extremely capable mage who controls the closest thing their is to civilization outside of their works. He had mastered particularly powerful ways of breaking people's wills with rape. In one of the most elaborate sex scenes in the book, the mage rapes the summoner until he breaks, and then turns him on his compatriot. However, when he brings her back in chains, it is revealed to be a ruse, and they take him down in his moment of triumph. The story then jumps back in time two weeks, to where the summoned protagonist saw this coming and turned on their alternate self, attacking them by surprise. The summoner is revealed to have been working on their own plans to do the same, but was caught by surprise and defeated. He tries several times to reverse the situation after being captured, but is forced to concede. Defeated, he goes along with her as she breaks down and rebuilds his mind, keeping much of the same personality but subservient to her. They had realized what made normal people ineffective once defeated was that they only valued themselves, so they fought to prevent it with all their might, but when that self interest was broken, they didn't have anything else. By getting him to give in and work with her, she didn't have to damage that bit, allowing him to retain the capability for independent action. The mage's attempts to break him were doomed to failure, because he already had a master. It then spends the remaining chapters on detailing all the various things she changed about him and some kinky sex, before ending on a scene of them preparing another summoning spell.

In the third novel, a student named Violet is isekaid to the Tessaverse’s past, where she finds herself hundreds of years ago in the city that would later form the nucleus of the Tessaverse. Upon realizing this, she makes a name for herself in the field of mathematics. The story goes into great detail on the subject from first principles, but the Tessa largely seems to focus on creating a coherent basis for mathematics rather than redevelop specific new techniques; the impression given is that the author believes this is obviously the most important part of math. One of these achievements, the cubic and quartic formulas, catches the attention of a famous polymath in a neighboring country named Elle. In proper history, this woman had revolutionized a dozen branches of mathematics and science but had always despaired of the fact that nobody could keep up with her, and ended up with most of her work unpublished for decades after she died young from disease. Violet already has something of a crush on Elle, but experiences severe imposter syndrome due to feeling like she was being given credit she didn’t deserve; her publications had been based on the work of others, including Elle herself. From there, the story covers the protagonist’s struggle between being seduced by Elle and her attempts to grapple with the false impression she has created, which is made all the worse as her love interest steps up her own efforts in an attempt to keep up.

Alongside the romance comes a series of mathematical developments, each shown and proven in the pages of the work. Despite her guilt, Violet increases their own work rate in an attempt to put off disappointing Elle, which culminates in her releasing a proof for the fundemental theorem of Calculus just ahead of Elle’s own work. At this, Elle asks Violet out, at which point she spills the beans, confessing her secret. Rather than reject her, however, Elle remarks that this just means that the protagonist knows even more things that she doesn’t, and declares her intention of getting them out of her before silencing her with a kiss. A short sex scene follows soon after, but it’s clearly a lot more vanilla than the previous works and is not the focus of the book. Checking the documentation will reveal that they were delighted to hear that Abrogail was interested in mathematical uplift, which is a popular Tessaverse genre that they haven’t seen much of in any of the other worlds they’re receiving fiction from. Supposedly this is one of the most popular examples of the [mathematical-romance] genre in the Tessaverse, but they apologize if it wasn’t technical enough for her taste because they know some people have high standards on that score (The book is, by the by, over half mathematics, history of mathematics, and philosophy of mathematics by volume). That this might be a miscommunication does not appear evident in their commentary.