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I call my step-son in to my room, tell him to sit down and explain I was cleaning his room and found the cock pump from mine and his step-father's room. I threaten to tell his step-father unless he does exactly as I say. I get him to drop his pants and notice how large his cock is. He then tells me he thought it was a fleshlight. I decide to show him how a cock pump works, and get him to cum.