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Unbeknownst to his girlfriend, he's been sneaking peek at her sister's luscious ass and full, natural tits. Now, with the house to himself, he can't resist the urge to indulge in his fantasy. He strips naked, his cock standing at attention, and begins to tease himself, running his hands over his body, pinching his nipples, and cupping his heavy balls. His breath hitches as he finally wraps his hand around his throbbing cock, jerking off furiously, lost in his forbidden fantasy.