Lust's Lubrication: Thick Cock, Tight Pussy

A voyeuristic brother can't resist the sight of his big-bottomed sister shaking her booty in the mirror. He strokes his thick cock, fantasizing about burying it deep in her plump cheeks. She catches him watching, and instead of shaming him, she joins in, grinding her ass against his eager dick. They explore each other's bodies, their moans echoing in the room, until they're both desperate for release. Will they cross the line and fuck, or will they stop before it's too late?

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