Horny American guy has forbidden sex with his wife's sister

A typical American guy with a hot girlfriend and a beautiful wife. But he's got a problem, his wife's sister is always at their house and she's really fucking hot. He's always trying not to fuck her, but every time he fails. Today, when his wife and her sister were at the store, he decided to call his girlfriend to his house and fuck her on the couch. But when he was about to cum, his sister-in-law came in and saw him fucking her. She was so fucking horny that she immediately wanted to fuck him right there. So, after a hot sex with his girlfriend, he fucked his sister-in-law as well. It was the hottest sex ever.