"You don't look so good over there slave. Your poor balls must be aching pretty badly by now, I imagine. Must be really horrible for you. Are you sure they don't need to be emptied slave?. Just think about that relief for a second. All the pressure just gone, vanished. Don't you want that slave?. Dont you want to feel better?"
"P..p..please mistress"
"Alright then slave, how do you feel about some edge holding?. I mean, since you're so confident about not having to ruin it?. Let's see if it's true, stroke yourself nice and close for your mistress"
(You do as you're told)