There are so many ways for submissives to be useful. It's especially enjoyable when they can serve multiple purposes at once. Today, I have one of My submissives on hands and knees, locked in chastity, blindfolded, with a coaster-gag in mouth -- The perfect bench for Me to sit on, with My water next to Me, for some afternoon delight. It's so arousing to Me, and makes Me cum so quickly, knowing My sub can feel My weight, My skin, and the vibration as I masturbate, but can't see or otherwise touch Me. Such a beautiful reminder of their place.