In a dimly lit Argentine home, two siblings, driven by curiosity and hormones, find themselves in a compromising position. They begin innocently, teasing each other with words and glances, but soon, their desires take over. The brother's 'polla' tents his pants, while the sister's 'pija' throbs with excitement. Their bodies pressed together, they succumb to their taboo longing, exploring each other's virgin territories with eager, clumsy hands.