I couldn't find group sex, but I did find a scene where you can sleep with one of the party members (she kicked out the npc), her whole story plot seems to delve into femdom (along with blackmail) the GM is questionable for femdom, but she is definitely corruption, like holy hell was that hot.
Edit:
okay, I've played this game pretty thoroughly now. It is pretty neat in how it starts and the gameplay/story at first but....it kinda becomes painfully obvious how this game is gonna go. I can already predict the routes and everything from what I've played.
Sarah is aggressive and blackmailing, she's completely prepped to dom you and set you up to be cucked
Elena is gentle but very clearly corrupting you to become a girl, not only calling you that but training you to take cum (your own....for now), which...lets be real, we know how that's gonna go when you have a really hung black dude hanging around.
I realize the target audience and nature of these games, but just once, I'd like to play one where you remain hetero, where the girl just gets off on sissifying/having you crossdress but ultimately is just a relationship between the two of you. Both girls are clearly planning to use you for ways to deny/humiliate the MC as much as possible and have him go into guys. The difference is do you want the rough/dive straight in, unwillingly but forced route or do you want the sinister/slow corruption where your own mind and sanity are twisted and molded. (clearly a physical/real aspect of the transformation is happening too).