The siblings, hidden away in their secret sanctuary, let their inhibitions melt away. The brother's cock, rigid with need, finds its way into his sister's eager mouth, her tongue swirling around the head as she takes him deep. She switches, straddling him, her wet pussy sliding down his shaft, enveloping him in her warmth. They move together, their bodies slapping in rhythm, the scent of sex filling the air. They climax together, their bodies trembling, before guilt washes over them, leaving them to dress in silence.