Ballbusting Mistress' slave after months locked in chastity

Description: Mistress kept her slave locked in chastity for many months, today she decided to let him free, but only on one term. she will add to his freedom a little pain, by kicking his balls, squeezing them and slapping. her actions make him very horny and it's very visible. he knows that his mistress will lock him in chastity again after his balls will be painful and swollen, just to add a little bit more uncomfortable feeling when he is locked in a chastity.