Bound at the wrists and ankles, the submissive girl lies on a cold, hard surface, her body trembling in anticipation. The mistress looms over her, a strap-on cock dangling tantalizingly. She smirks, "You're going to worship my cock, slut." The girl nods eagerly, opening her mouth wide. The mistress feeds her the cock, fucking her mouth until she gags. Then, she positions herself between the girl's legs, teasing her wet pussy with the tip. The girl moans, her body writhing, desperate for penetration. The mistress laughs, "You're such a needy little slut." She pushes in, filling the girl's cunt, and begins to fuck her with slow, deliberate strokes.