Ballbusting lessons in front of 2 slaves

Description: Me and my girlfriend have 3 slaves here, 2 of which are completely new to ballbusting. so, teach both of us how to ballbust. slave stands there and wears collar with leash. other 2 slaves are at pet play and kneel between me. me and my girlfriend start with ballbusting with our high heels and also with hands, while we are doing this he gets hard, this is exactly correct ballbusting.