Played it for the ntr, stayed for loving waifus. For me, not every game can make vanilla "work". Some games can not give you the thrill of love, so the scenes just look like a sex simulation. Bound by Lust, though, with all the sounds, different perspectives in the scenes, music and writing is able to give you that feeling. After really getting into the game, I didn't even want NTR anymore.
I have two gripes with it, one is the visuals. Girls look good (although Dana's waist is just a little too thin in some scenes), but I guess the lighting messes it up a little bit. And the enormous breasts in some girls, like the principle for example, isn't the most attractive thing for me. Second one is time management I guess I could say. Everything happens directly after school, so you are always basically vacant in one period of a day. We should be able to talk and progress the story of Naitlyn, Karen and Jane after the evening (I mean after you get enough points to get into their room).
Anyways, overall a pretty great game.