Roleplay that we are brother/sister...
so my wife and I usually just have nice, ordinary sex.. but we like to role play when we are really in the mood. I just seemed to notice that we both usually get real turned on when we pretend we are brother and sister, 15-16 and she likes it when I try to sneak in and kind of force it on her. Maybe its just some silly little fetish... but when she has the mere thought of that happening with her real brother, it makes her sick and she wonders why it turns her on with me. anyways, we laugh about it and call eachother perverts for even enjoying it so much.. but do others simulate this as well and is it normal?