You can unlock cowgirl, titjob, and titjob+blowjob combo, but that's about it when it comes to the interactive scenes. There are some erotic animations for going to different locations too, just don't let her get molested on the train more than twice unless you wanna lock yourself out of the epilogue "after story". One strength of the game is how the different hair/clothes actually change her appearance during the sex scenes. It's not very common for pixel games to give you that level of customization.