I tell you that I want to try lightly slapping your balls while you stroke. You're resistant at first. Come on, just try it with me, I really think it would be exciting. I start by slapping your balls playfully, just teasing you. You start to enjoy it, just like I knew you would. I slap harder and harder, and your cock throbs. You start stroking hard and fast as I deliver blows to your scrotum. I allow you to orgasm, finally, as I slap as hard as I can.