I am really enjoying exploring Cock and Ball Torture (CBT) with my subs. CBT is one of my favourite past times as I love to see subs squirm as I torture them with my devices.
There is something special about making a slave vulnerable by having them by the balls. I can make you humble and obedient with my humbler or crush your balls with all my might.
I have amazing CBT devices imported from Europe and Asia and like to explore your limits with them. 
Some of my favourite activities urethral play (sounding), electro-play, impact play (hitting), hot wax play, squeezing, stretching and crushing. This needs to be done safely with me gradually building it up and stretching your limits.