The Simpsons' closeted desires come to life as Bart and Lisa succumb to their forbidden curiosity. In the dimly lit family treehouse, they clumsily grope and touch, Bart's young cock hardening against Lisa's thigh as she tentatively strokes it. They stumble through their first sexual experiences, their innocent faces a stark contrast to the kinky acts they're learning, until a sudden noise from Marge forces them to quickly hide their secret.