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For majority of my pregnancy, step-Mommy has said that step-Daddy got her pregnant… but you found out otherwise. Trying to blackmail step-Mommy into telling you the truth, you quickly realise that step-Mommy is a slut anyway, and she spins the situation onto you, chastising and humiliating you for thinking you could lord anything over her. She did you a favour by fucking your bully - his dick is so much bigger than yours, anyway. step-Mommy masturbates as she talks you through exactly how he used her like a slut, exactly how he fucked and masturbated into her tight cunt and got her knocked up. She teases you for never making the move on her first, before eventually getting so horny that she slides her pussy on your cock and rides you, demanding you cum inside her pregnant pussy.