Arse Worship for a Leashed Slave

The slave is due a reward. It's a special reward. He is being allowed to worship Miss Jessica Hyde's arse! What a treat. However, there is going to be a catch. Miss Jessica does like to keep her slaves on a tight lead, literally, and ties the cock and balls tightly. As he then gets close to worship her divine arse, there will be a constant pull on his balls, reminding him of his place.