I Got An Erection When I Saw Her Having Sex With My Friend At Close Range P2

Today, I invited a friend over to the apartment where I live with my girlfriend, and the three of us had a party. My confused friend and my girlfriend started kissing passionately, and then she took off his pants and gave him a blowjob and titjob! And for some reason, I just stared at them without stopping them. As the two of them got more and more excited, the bulge in my crotch grew bigger and bigger…