In the confines of their teenaged world, a sister and brother grapple with their burgeoning sexual awakening. Their bodies betray them, hormones raging as they innocently share a bed, trying to keep their distance. But one moonlit night, their restraints snap. She reaches out, her small hand finding his hardening cock, tentatively exploring its length and thickness. He stiffens, but as she continues to stroke him, he surrenders to his sister's touch, their shared taboo lust consuming them both.