Well...this is something I do with my wife since I am so small and have a hard time penetrating her with any length. She will lay on her stomach and i straddle her ass and slide my little dick between her ass cheeks (just like tit fucking). It only takes a minute or two and it makes me cum on her ass. I really enjoy doing it --but it wasnt until I watched one of the guys that fuck her regularly do that to her. He is a pretty good size and watching his big cock slide between her cheeks was amazing. Even better when he shot his load all over her back like that too. Just wondered if any of you bigger guys enjoyed doing that too.