I fucked my friend's wife in the ass, while he was in the room next door.

I was at my best friend's house and I went to the bathroom for a moment, without realizing it was occupied by his fiancée, she got really horny and we ended up fucking, she wanted me to fuck her ass and cum inside her, so as not to get her pregnant and I was fucking her against the toilet until I squirted all my milk inside the slut.