The game is called "My Sister, My Roommate" but since there's endings with other girls and Nikki has the choice to get her own man, I was hoping you could avoid having sex with her, but the game forces you to. I guess the beginning scene with Grant turned me off from wanting a relationship with her. The MC doesn't even care his sister banged a dude in the same dorm he was in. Throughout the game the MC is a complete wimp when dealing with his sis and you can never say no to her, he's oddly obsessed with her, and even if you say you're fine with Nikki seeing other people he still stalks her when she goes on a date. Also there is no Jessica or Skylar endings.
Overall, still enjoyed and thought a lot of the situations were hot, just wish there was more choice.