The siblings, locked in a cramped attic, their parents out for the night, succumb to the primal urge that's been simmering between them. She, a virgin in every sense, timidly touches his cock, her fingers exploring its length, marveling at its heat. He, in turn, gently parts her legs, his fingers delving into her wet, untouched pussy. They're clumsy, hesitant, yet eager, their bodies learning each other's rhythms. Their moans fill the small space, echoing off the dusty furniture, as they push each other closer to the edge, their incestuous dance culminating in a mess of spilled cum and juices, leaving them breathless and ashamed, yet yearning for more.