I haven't quite figured out how it'll work just yet (in terms of potential interactions between the different girls living with you, etc.), but I want to make it possible to have multiple girls living with you at your home. :)
I see how that would be difficult with all the different personalities and similar stuff, Maybe a secondary stat to affection could work or something, like openness to poly or similar? Almost like the Fitness? Maybe some could be against it and some more open to it and would accept to coexist with other girls way easier. For the less open, once they are immobile you could move them to your home (Maybe a low chance like the concentrate in the feeding machine?) if they agree to be cared by you and they would be "forced to" cohabit with other girls if they accept? Each personality with their own reactions and stuff.
Just a few ideas that could, or could not work. Anyways, good luck with the development! I'll be patiently waiting for the update.