In Oliverato12's taboo tale, two siblings, both virgins, find themselves alone and horny. They tentatively start masturbating, the girl's fingers exploring her wetness while her brother strokes himself. Caught in the act, they argue, but lust prevails. Naked, they face each other, the brother's massive cock throbbing. The sister, fantasizing about his thickness, encourages him. Just as he's about to penetrate her, someone enters, halting their forbidden union.