The old guy next door was such a bully. He constantly told you how your generation was soft and weak. You ignored him, until one day he saw your GF come over. "I'm ten times the man your BF is. Come find out," he told her. You stood outside and listened to your GF moan in ways you had never known...
Your bully covered your GFs face when he fucks the shit out of her, so you don't recognize her in the video. She gets so turned on knowing you gonna jerk off to your cheating GF without knowing it
Your mom told you that she would solve the issue with you bully. You were happy. Then you peeked in and saw her method. Needless to say, you had a confusing boner.