The sub's tongue darts out, licking the tip of her partner's cock, teasing the slit before taking him in whole. Her cheeks hollow, creating a tight vacuum as she sucks, her eyes locked onto his. He groans, his abdominals tensing as she works him, her hands massaging his balls. She can feel him swelling, knows he's close, and she redoubles her efforts, wanting to taste his release, to swallow every drop, a sign of her devotion and pleasure in serving him.