I invited a friend to my girlfriend's apartment, where we live together. After a lively drinking session, I deliberately let only my sleazy friend stay the night, since he'd missed the last train... But in the quiet of the night, my friend's hand crept towards my beloved girlfriend... At first she resisted, but she was swept away by the moment, and secretly let him finger her right next to me, and even gave him a blowjob... I actually saw everything as she trembled with a mixture of guilt and pleasure...