You can have more scene with rinny if you leave and re-enter transylvania, then go to the succubus tower, after that she will greet you and ask what scenes you want to do with her, if you keep saying "no" repeatedly you can pick which scenes you want and if you go to the 2nd page of the choices you can pick the last choice(or 2nd to the last choice if you have seen the dream event which happens randomly when you sleep) and have a futa play with Rinny.