I invited some friends over to my girlfriend's apartment. We were having a lively drink, and one of my friends purposely missed the last train, so I decided to let him stay the night... But then, as everyone slept, my friend crept up on her... She initially resisted, but was carried away by the momentum of the moment, and quietly caressed me next to her. I had seen the whole thing, trembling with immorality and pleasure. After my friend got off, he went home, but the guilt and heat still lingered...