Explicit sexual content.
It might possibly become clear to her around the time that - after previously having given Keltham occasional and often mood-breaking feedback about exactly what level of pain is, not even 'too much', but optimal for her arousal - it becomes clear that Keltham also has the ability to just directly read her arousal for purposes of, for example, backing off just before she has an orgasm.(Submission? Masochism? Why would you need either of those in a partner for them to appreciate that? Why would dath ilani require either a desire to serve or a desire to feel pain, in order to prefer that their partners do more work in order to increase the integral of their pleasure over extended time?)