in the scene with the 3 elves kidnapping MC while in disguise, MC gets to learn that (revealed later to be Ann) went along with things to basically help/protect them [or just Nia?]. Also in it Sylvia says she wouldn't mind having sex once a week or so as part of the 'Buy all 3 of us demand/offer...' [and this was without MC adding any commentary about paying 14k for them & feeding/housing them etc]. It was obvious that Ann felt bad about what they were doing and had done to MC, and that all 3 of them saw him as different from other 'Masters'. During it i was thinking, and i will say yes and then either call LEOs or ?? because i couldn't see an honest benefit for doing it when i could go have a threesome with Kali & Lucia or take Emma to the beach, or Maria to the beach, etc. the elves in their desperation and Nia having no trust, drove them to the buy us or else...and like it plays out in the scene... they really DON'T have anything to offer him except themselves.
But like i said, seeing a story where Nia has to be brought around to trusting MC -now all the while doing the Bat-thing; and risking everything he has been building by doing so.... Yep, i got hooked... MC wants sex, wants lots of it from as many ladies as possible... but would he really risk everything for no reward, and for huge headaches in Nia's case, literally ;-)
It's sad that you don't plan on much 'story' for Ann; but if she is more of a mind like Jin, i.e. has no qualms about sleeping with MC then the only part too develop would be her back story and learning more about dark elves/elves. She knows who MC is, was envious of Lin & his very obvious bond. * Maybe the story could be something like that;seeking a more fulfilling relationship? She was genuinely nice to the other elves even though she hadn't met them, and they were literally her competition; made me like her instantly (kwim).
on the question Poll... in a society that has androids wouldn't they have cybernetics that would make wheelchairs obsolete? After all Sylvia's 'sacred' tats were removed, with No visible scarring at all, and they were significant. Demonstrating very advanced medical technology in addition to the robotics & AI tech.