Watching his butt bounce like that makes my dick hard. While he is pounding and making that butt of his move up and down like that. I want to be behind him giving him a butt rub massage while I kiss and lick his butt cheeks. Then rub my dick on his crack between his butt cheeks and hump until I cum between them. Like a hotdog exploding between buns. I want to feel his butt bouncing underneath my dick. It would be an incredible orgasim experience