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A guy is about to finish and a girl walks in or talks to him at the worst time. Instead of running away, she grabs his junk like it's a sandwich and doesn't let go.
My cousin got caught by his mom while he was jerking off. She grabbed his junk and said, 'You're gonna finish in my kitchen?'
He was halfway done and his ex walked in. She said, 'I didn't come here to watch you whine.'
He was about to climax and his sister walked in. She said, 'You're gonna finish in front of me? No way.'