itch.io

This is already a HScene but it have some condictions to the masturbation became a true sex.
For example, at that same day that you gave to the sister the candy, once you return home you can select to cook or go to bathroom, if you go to bathroom and search for something, you may find a cockroach, at same day, if you give the candy and watch her masturbate, that cockroach may appear again and scary the sister, then you will help her and now you will have sex.
Small things like that is what make the game fun, I would recommend find it by yourself because is part of the experience.