Today my slave and I are going to play a little game. I've got him all belted and bound, including his cock. He's been begging for weeks to have his face sat upon. I just couldn't figure out the right sacrifice to earn such a reward until today. He'll get my ass on his face. Unfortunately for him, while my face is on his ass my nails will be in his balls. He'll only be able to in my sweet ass for as long as his sensitive balls can last in my sharp grasp. The high of being smothered by my ass will only be broken by the dagger-like pain in his balls. This seems a fitting trade.