A stern mistress presents a chastity device to her eager slave, promising pleasure only on her terms. She teases his stiff cock with her delicate fingers, tracing its length through his boxers. 'You'll only cum when I say so,' she purrs, locking the device onto his throbbing member. She strokes him expertly, bringing him to the brink of orgasm, but with a cruel smile, she denies him release, leaving him panting and desperate for more.