I'm not sure about mind control. You could try suppressing self-control or "wild oats", or try turning them into a drone.
Stephanie is a hard one to keep as "yours" without missing out on a lot. Try Nikki. She has been greatly expanded and if you share her, it's with another girl. There are some things that you may not like, but those things are as bad, or worse with Stephanie. Mom is another good one. You can avoid the cum dumpster scenes by ignoring her when she comes home drunk while in Nympho phase. Also, don't use her to distract Freddie. She's a bit of a sadist though. I don't think Denise has any gangbang scenes, and she has fetish content that doesn't involve strange dicks or getting punched in the face while fucking her.
Best bet is to just go with the flow, and have a laugh if the scene isn't to your taste. You can also opt to limit corruption of "your girl" and keep her nice. It won't work well with family though. Good girls don't fuck their brothers.