I used to do that with Kat.. She used to dress me up in her clothes (they fit, shes big) and make me the girl while she played the man..
She would demand that i let her eat my asshole out and then she would pretend to fuck me like she had a dick.. ramming up against my tushy... then after she pretended to orgasm like a guy... she would make me face the wall and spooned me lol
I Swear to god if you tell anyone i'll never send the Mast!

