In a haze of alcohol, siblings stumble upon each other's naked forms, inhibitions lowered. "Dios mío," she gasps, her eyes widening at the sight of his throbbing erection. "No debemos," she murmurs, yet her body betrays her as she straddles him, her wet pussy sliding down his length. They fuck hard, their grunts and moans filling the room, until they're left panting and ashamed, wondering how they'll face each other sober.