JoeBanks Perhaps teasing scenes should be added more frequently where the girls perhaps do things that the MC could take advantages of, without the girls being aware of their actions being used for sexual pleasure by the MC. One example could be as followed, "The giant troll (from the first harry potter movie) has broken it's way into the school in search for (panties?), one of the girls decides to run up to Dumbledore's office and tells the MC that she needs to hide. The MC quickly grabs her hand and locks her and himself inside the wardrobe where the back of her skirt gets pushed up against the MC's crotch due to the tight space. This causes an erection and since she's frightened for the giant troll to find her, she starts shaking, which causes her to start moving her legs up and down at a fast pace (unintentionally). The MC tries to tell her to stop moving but she interrupts him with her worried mumbling. She is not aware of the situation and doesn't know that she's currently rubbing her ass against his crotch by pushing up against him and shake out of fear. When it's all clear to come out, they exit the wardrobe without him mentioning what just happened because he never intended for that to happen in the first place, and she thanks him for letting her hide in his office. She then leaves without a single thought about what happened behind her back since she wasn't aware of what she did."
Things like these could be added here and there through out the game to lengthen the story a bit without adding sex scenes out of no where as said by one of the developers could be a bad idea.