Katerina, the dominant sibling, lures Pyotr into her web of desire. She commands him to sit, her voice laced with authority. She straddles him, her breasts pressing against his chest. She grinds against him, her wet panties rubbing against his hardening cock. She leans down, her breath hot on his ear, "I want you to cum, brother. I want to taste you." She unbuttons his jeans, her hand wrapping around his cock. She strokes him, her touch firm yet gentle. She leans down, taking him into her mouth, her tongue flicking against his tip. Pyotr's hands tangle in her hair as she sucks him, her mouth hungry for his release.