Bored and curious, a young brother and sister find themselves alone in their parent's house. Unable to resist their growing curiosity, they begin to masturbate, each in their own room. The sister, her pussy dripping with excitement, moans softly, hoping her brother won't hear. Unbeknownst to her, he's doing the same, his cock rock hard, imagining it's her hand stroking him. Their secret session is interrupted when their mother walks in, leaving them both red-faced and flustered.