I jerk off as i watch my coworker cheat on his wife with another.

I had met my co-worker at his house to have a few beers and talk about some common projects. when i get home, he barely opens the door for me and won't let me in saying he's busy. when i look through the keyhole i get to see how he fucks a boy's ass wildly. often he is my friend and how hot it makes me watch how he fucks a guy in his own house while his wife is away. i can't help but jerk off while spying on them.