Devilish cruelty

It all started when my wife and I were watching television one night; it was one of those police detective shows that proliferate across the weekly viewing, in this one the villain had a sadistic kink and was capturing young girls and tormenting them.
We watched it through and then went off to bed. We talked of the show and agreed that the plot had been rather stupid. Somehow though, we began talking of the kink the guy had towards girls.
“I can’t see any pleasure in hurting someone like that unless they wanted to be hurt,” I commented.
My wife was a little surprised and asked would I like hurting a girl if she wanted it.
I felt a bit embarrassed at what I’d unthinkingly said. “Well, if someone wanted it,” I mumbled.
“Would you like to hurt me,” my wife persisted, still seeming surprised at my admission.
“No, of course not, because you don’t want it,” I replied, although the thought of it really turned me on.
“Well you can hurt me a little bit if you’d really like it,” she casually told me.
I was really surprised at what she said. She’d never shown any kinkiness before and I thought that she was just being frivolous.

Nothing more was said and we got into bed and the light was turned off.
We kissed and my hands began to slide over my wife’s belly and up onto her breasts.
She slid her hand to my hard cock and fondled it beautifully.

Soon I had her on her back with knees slightly raised and legs parted. I easily slid my cock into her very slippery cunt.
She sighed, we kissed, and our hands constantly explored each other’s bodies.
Slowly, deeply, I fucked her, controlling myself so that I could keep going.
Our excitement grew and we were both breathing hard. She was moaning softly and getting really hot.

I took each of her nipples between forefinger and thumb, and began squeezing and rolling her large nipples between my fingers.
We fucked and kissed and licked at each other, the whole time her pussy being probed by my lusting cock.
I could tell that she was becoming more and more excited as my cock began to shove hard into her body and her breathing turned to excited panting.

I was now squeezing and twisting my wife’s nipples so firmly that she was giving little gasps and cries. We’d never done this before but I was worked up because of the movie we’d watched, and because of what she’d said afterwards.
I was now panting hard and fucking hard, although still slowly so as to hold myself in check.
I screwed her nipple around and around and she gasped and uttered cries of pain.
I wasn’t sure what she’d be thinking and I asked her if I was hurting her too much.
“It’s alright darling, keep hurting me,” she whispered softly and lovingly.
Fuck! I was fucking thrilled by this, so I took her at her word and grasped both nipples once more and began squeezing and twisting even harder.

Soon I had her gasping and crying out loudly as I worked harder and harder at her nipples.
After a little while I asked, “had I better stop?”
She unhesitatingly whispered, “no, no, it’s all right, keep doing it.”
“You sure?” I asked as I hesitated.
“Yes, keep going,” she said softly.
“I think that you like being hurt a little bit?” I suggested excitedly.
“Yes,” she answered in a voice that was hardly audible.

“Arrr, owwww,” she now gasped plaintively between gasps of anguish as I pulled, twisted and squeezed as hard as I possibly could.
“Oh God!