In the dim light of their cramped dorm room, the sister and brother, bound by secrecy and shared lust, engage in a heated exchange. He runs his hands over her curves, feeling her nipples harden beneath her shirt. She reciprocates, tracing the outline of his cock through his jeans. They strip each other, their breaths ragged with anticipation. He explores her tight, wet pussy with his fingers, making her gasp, before she guides him inside her. They move in sync, their bodies slapping together, until they both reach their peak, climaxing together in a wave of pent-up passion and relief.