Blackmailing his step sister
When he catches his step sister masturbating in the bathtub, he videotapes everything on his phone. She finds out and he tells her he is going to post it online. Unless... she gives his cock some special attention. She refuses at first, but when she starts rubbing his dick she realises this is something she wanted for a long time as well. She starts sucking his dick very gentle and softly. Then she gets up from the bath, turns around and offers him her naked ass to play with. He knows just what he wants to do to her.
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