In a steamy, cramped bathroom, Michelle and her stepbrother, both clad in barely-there towels, find themselves alone and horny. Michelle, fingering her wet pussy, can't help but notice her brother's growing bulge. He catches her mid-act, and their heated argument leads to an unexpected truce. They decide to masturbate openly, Michelle's eyes widening at the sight of her brother's thick, straight cock. As they're about to act on their mutual desire, an intruder forces them to abruptly end their intense, taboo encounter.