I'm having fun with this, and we see an interesting side of demon-culture. The fact that female succubi fear the power of their Incubi NTR-Master (though, ironically, female succubi must also be NTR masters) other halves is pretty funny. It's a good challenge and fun for the group. That the Sister is trying to help her is also interesting.
I'm confused about the people offering progressive 21st-Century Western parenting and relationship advice to two characters (father and daughter ) who are clearly intended as representative of an elite, racial, and East Asian caste system. No (Un-Americanized) Asian parent who practices marriage selection gives a shit if their child prefers the same sex or is in love with their selected partner (they may look for some compatibility if they are being somewhat considerate), they're still getting married and having kids, however many affairs they have on the side.
The guy who mentioned pulling the contract card is on a solid line of reasoning though.