In the dimly lit confines of their shared room, the siblings' eyes meet, a silent acknowledgment of their shared secret. She's been sneaking into his bed at night, and he's been welcoming her with open arms, his cock hardening at her touch. Tonight, they've decided to take it further. She strips off her nightgown, revealing her naked body, her nipples hard with desire. He watches, his breath hitching, as she climbs onto his lap, his cock already leaking pre-cum. She guides him inside her, her pussy stretching to accommodate his thickness. She rides him slowly, her movements deliberate, her moans soft and low. He grips her hips, his fingers digging into her flesh, as he thrusts up into her, their bodies slapping together. She leans back, her hands braced on his thighs, her tits bouncing as she takes him deeper. He feels her pussy clench around him, her orgasm approaching. He flips her onto her back, pounding into her until she screams, her body convulsing with pleasure. He follows soon after, his cock pulsing as he fills her with his hot cum, their taboo love consuming them both.