In the dim light of their shared room, the siblings, clad in their underwear, begin to pleasure themselves. The sister, her pussy dripping with arousal, slides her hand under her panties, while her brother, his cock rock hard, grips it tightly. They lock eyes, their breathing ragged, as they masturbate furiously. The sister can't hold back, her body convulsing as she orgasms loudly. Her brother, unable to resist, joins her, his cock pulsing as he cums onto the floor.