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My 18-year-old sister-in-law, a cute, petite thing with small tits and a big ass, is completely oblivious to my desires. Today, I decide to act on them. I follow her around the house, my cock hard and ready. She's wearing a thong, her ass cheeks peeking out, driving me wild. I can't help but push into her from behind, her tight pussy squeezing me deliciously. She thinks it's her boyfriend, moaning and pushing back. I fuck her hard, my cum filling her up. She feels it, but still thinks it's him. I pull out, my seed trickling down her thighs, and she wipes it off, none the wiser about our secret encounter.