Maybe the daughter gets obsessed with the mc, maybe stalk him, could be fun with your humor I'm sure, but I wouldn't go with the three way with the mom, I know most people fantasize with that but the reality is very different, for ten years on my birthday my girl, wife for 8 years now brings a girlfriend and we have sex, but the first time that happened I notice that not once they kiss or touch each other in a sexual way, both were on their knees fighting for me but no contact between them, morning came, the three of us shower together, had breakfast, say our goodbyes and I ask her, how come you didn't kiss or something? she just roll her eyes and said, if by some miracle I would agree to have sex with you and another guy, what would you say if I ask you, how come you didn't suck his cock? I didn't responded but my mind went nnnnnoooooOOOO!!! She just started laughing and said, there you go, so I know this is mind shattering but yes, not all girls like girls.