In a cramped attic, Polish siblings engage in a heated game of 'ja' (yes/no), their bodies pressed close. She's wearing just a sheer nightie, he's in boxers, their games turning from innocent to charged. He asks if she's ever thought about him like that, her breath hitching as she admits she has. Their hands start to wander, exploring each other's bodies with a newfound hunger. They kiss, tentatively at first, then with growing passion. She pushes him onto the floor, straddling him, grinding her wet panties against his hardening cock. He flips her over, hiking up her nightie, and slips a finger inside her, making her gasp. But just as they're about to go all the way, a floorboard creaks, and reality crashes in.