Two siblings, locked in a dark room as punishment, find themselves drawn to each other in their isolation. As the youngest's curiosity gets the better of him, he reaches for a nearby plumber's snake, running the flexible metal through his fingers, imagining it's something else entirely. His sister watches, intrigued, as he tentatively touches it to his cock, the cold metal sending a thrill through him. She can't help but wonder what it would feel like inside her, and as their eyes meet in the darkness, they both know they're thinking the same thing.