Innocent stepsister, skeptical of her brother's claims, demands proof of his manhood. He reluctantly obliges, pulling out his throbbing cock, already leaking pre-cum. She watches, wide-eyed, as he strokes it, her curiosity turning into disbelief when he starts to cum, ropes of it landing on her shocked face. This is her first encounter with the reality of male pleasure, leaving her both stunned and intrigued.