I want to f**k my sister! what should i do i think about f**king her when i masterbate and i day dream about it all the time. Is this bad? should i tell her and see if she feels the same?
Yes you have to tell her about it. I know a guy that told his siter and she felt the same way and wanted to check him out. We even both do her sometimes. So say something and see how she likes hearing it