Bored siblings, left alone, discover a mutual curiosity. The brother, Ctafricancoco, begins stroking his growing erection, his eyes wandering to his sister's curves. She notices, and a spark ignites. He continues, his dick throbbing in his hand, as she watches, her heart pounding. She tentatively touches herself, her panties dampening. Their eyes meet, and the tension snaps. They jerk off together, their moans filling the room, until they both explode in simultaneous ecstasy.