Torturing Cynthia's tits

I decide the first step is to start to include erogenous zones I've pretty much ignored until now. I reach down and grab a hold of one of Cynthia's big tits. The soft flesh of her magnificent udders presses between my fingers as I start to knead and caress the soft flesh, while I continue to keep up soft thrusts into her. For better access, I flip her from her side onto her back and replace my hand on the tit, while my mouth starts to suck and nibble the other. I quickly find her erect nipple and start to suckle, while my fingers squeeze the other nipple.

"Aah!" Cynthia moans. In the past, I have been able to get her to cum just by playing with her tits. It takes a long time and a lot of effort, so I usually don't bother, but assaulting her tits is a good strategy if I want her to cum while fucking.

Cynthia lets out another moan as I continue to fuck her while her stiff, long nipples are receiving my attentions. I gently bite down on the stiff nipple, the rough texture yielding under the hardness of my teeth, while my tongue teases the milk duct at the tip of the nipple. As I slowly increase the pressure of my teeth on her nipple, my hand is firmly squeezing the other tit. I put all the pressure I can on her tit, as if I was trying to burst a water balloon between my fingers, then move to the nipple, squeezing it roughly between my fingers. Then I switch, my mouth going to the breast that I was fingering and my other hand to the wet tit.

All through this Cynthia is letting out yelps and gasps and moans as the pain and pleasure mix and build in her body. I've barely begun again after switching when I feel Cynthia moan and her body shudder as another orgasm wracks her body. I continue to play with her tits through her orgasm.

All through this, I had only cum once and while that once had desensitized me somewhat I was well past ready for my own orgasm. I had been trying to stave it off as long as possible but as I felt Cynthia's rectum clench up on me in response to her titty orgasm, I was pushed past my edge. I let go of Cynthia's nipple and groan as I pull out of her ass, her sphincter opening and contract as if still seeking my cock. Burst after burst of cum erupts from my dick to cover Cynthia in my seed from pussy to tits. Spent, I lie down next to Cynthia and take a moment to recover.

After a moment, I hear Cynthia mumble something and notice that she has her eyes closed, her body occasionally twitching, leading to moans. Cynthia has been successfully fucked into unconsciousness. I grin to myself, though I am a bit surprised it didn't take more, I doubt she'll even have any marks on her body tomorrow from this.