Your step-sister catches you with her panties and decides to make you realise what a gross pervert you are. She berates you, telling you to get your cock out and cum, then getting angry when you can't even jerk off right. She takes your cock in her hand and shows you exactly how to stroke your pathetic cock, but begins to shout at you and slap it when you still don't cum straight away. Seeing how much you enjoy the slapping, she continues to jerk you off while hitting your cock until you finally blow a fat load. what a fucking loser.