Would you choose stroking over sex?
Mmm.. that sure felt good eh, strokerboy? Awww... your balls are blue again. Time for some relief again! Get that long and hard object again and SMACK those balls!! Give me 10 good smacks!! HAHAHAHAHA. You certainly are amusing!! It hurts so much, yet you keep on smacking your balls even harder!! HAHAHAHAHAHHA. Look at how My cock is controlling you. You even enjoy suffering for me now! Since you enjoy smacking your balls so much, I'll let you crush your own balls this time!
Get a good grip on those worthless nuts and just squeeze them, gradually using more force. Feel the pain gradually increasing. Mmm.. You DO want to hurt yourself for me DON'T YOU? Come on, squeeze them some more!! Squeeze them for Me!! Please your Mistress, show how unrelenting you can be towards your own nuts!!