While it can be fun to speculate and let our imaginations run a little wild with pretend scenarios with the characters we like so much, I don't really think we'll see much content like that in the game. While I still think Alex might be turned on by being dominated a little, I doubt we'll see much more than a little light sex-play in that direction. As for their relationships as a whole, outside of the bedroom (and kitchen, bathroom, garage, hall, broom closet), I just want to see everyone on an equal footing and in love with each other.
I'm obviously not BTT, and he will have his own ideas on what to add to the story and relationships, and should stick to that. He should not pay any attention to my fantasies and speculations at least, they are just for fun.