That would be great if not for the part where it probably results in noticeably less emotional attachment of Keltham to her, she's guessing, compared to the girls who actually have sex with him. The Asmodia thing - probably only applies to girls who are asexual, Ione is guessing? Like you can't just have sex with other people, or be able to have sex with other people, and not have sex with Keltham. Probably?
"I think I'm okay with that happening sometimes. If it happened always, that would be a problem..."
"I wonder if that happens a lot when Nethysians marry each other."