With a grunt, the muscled stepbrother slams his cock into his twinky sibling, the sound of wet skin-on-skin echoing in the confined space. The twink, though hesitant, can't help but moan as his brother's thick, veiny cock stretches him open, filling him completely. The older brother, driven by primal lust, grips the twink's hips, pounding into him with force, their bodies slapping together in a frenzy of sweat and desire. The twink, despite his initial reluctance, can't help but push back, meeting each thrust, eager for more of his brother's raw, unyielding cock.