“Please, I’m sorry…just–fuck!–please, just let me stop!”

Mr. Goldman had been pounding on his nuts with his metal ruler for about twenty minutes now. I was just watching, enjoying myself. I’d tried to warn him about flunking me in his class, but some people just think they’re beyond the reach of punishment. I mean, I could have always just *made* him give me an A in the class–but then how would he have learned anything at all? The only way we can improve is by making mistakes, after all.

Still, I suppose he’s had enough pain for the moment. The next time he smacks his sack with the ruler, I see the pleasure light up his eyes, and he moans, with a tinge of confusion, before smacking himself again. They’d swelled slightly, in the course of regular punishment, but now they were expanding much faster, his sack bulging until it was the size of a softball, and then larger–large enough that it would be obvious in the front of any pants he wore, even as his cock shrank in size to little more than a nub. 

“Oh fuck, how…how are you doing any of this?”

“Heh, if I told you, I’d have to kill you,” I said, “Or figure out something worse than death, perhaps. Are you sure you want to know?”

His academic curiosity was sated, but I still had plenty of plans for my least favorite professor, and he had all summer to discover a brand new side of himself, with my help.