Two inexperienced siblings, driven by curiosity and hormones, find themselves alone and bored. They begin to explore their bodies, tentatively at first, then with increasing passion. The brother, caught off guard, walks in on his sister masturbating. Angry words are exchanged, but their desires remain unsated. They later reunite, this time openly pleasuring themselves in front of each other. The sister's eyes widen as she sees her brother's erect cock for the first time. Just as they're about to cross the final line, a sudden noise outside their door brings them back to reality.