In the confines of their shared room, a brother and sister find themselves alone and aroused. The brother, his cock throbbing with teenage hormones, tentatively strokes himself under the covers. His sister, overhearing his muffled moans, can't help but feel a pang of curiosity and desire. She watches through the crack of the door as he pleasures himself, his eyes closed in ecstasy, his body tensing as he nears climax. She imagines what it would be like to touch him, to taste him, but she's too shy, too scared to act on her taboo desires.