A sleeping girl, let's call her Emma, is lying on her side, curled up under her blankets. Her partner, knowing she's a deep sleeper, decides to take advantage of the situation. He quietly slips under the covers behind her, his body pressing against hers. Emma stirs slightly but doesn't wake up. He lifts her leg gently and positions himself behind her, entering her slowly to avoid waking her. He starts to move, his hips grinding against her ass, his hands gripping her waist. Emma remains asleep, her breathing steady and rhythmic. He continues to fuck her, his movements becoming more urgent, his grip tightening. Just as he's about to finish, he pulls out and comes on her back, knowing she'll likely sleep through the whole thing. He then lies down beside her, satisfied, as she continues to sleep peacefully, none the wiser.