You've set your sub Pixie a wicked challenge. Two of your favourite things to watch are her yawning, and her hurting her boobs. So you decide she should hurt her tits, remembering to yawn through out for your pleasure. She uses her clamps, her paddle, and her vampire gloves on her tits, yawning long and wide for you. For the last five minutes you tell her to masturbate through her panties - until she cums, still yawning for you