Here’s my first attempt at flash fiction. I hope you enjoy it:

Francesca
by Anal_King

Francesca knelt on the center of the bed and glanced at me in nervous anticipation as I pulled my briefs down. When my pulsing erection slapped against my washboard abs, she gasped in shock. I usually get that kind of reaction from girls my age but never from the few older ones I’ve been with. 

Resigned to her fate, Francesca lowered her shoulders and rested her head sideways on the pillow. With trembling fingers, she reached back and grabbed her round ass-cheeks, pulling them wide apart. The sight of her creamy derriere caused my blue-veined fuck-stick to point straight to the ceiling.

With my heart hammering in my chest, I climbed on the bed and positioned myself behind her. Unable to hold out any longer, I grasped my fat, throbbing erection and leveled it with her slick, puckered anus. Looking at the size difference between her shit-hole and the mushroom-head of my dick, I wondered if her rubbery ring could even accommodate the large purple crown of my prick?
I was about to find out . . .
I slowly pressed the angry, purple head of my dick against her silky membrane and pushed. Her sphincter began to slowly sink in, forcing the surrounding skin to stretch until it was super tight. As I increased the pressure to overcome her stubborn anus, I caught Francesca’s expression in the compact mirror sitting on the nightstand: A deep crease had developed between her eyebrows. For some reason it made her look sexy.
I shifted my attention to the sight of my cock pushing aside the walls of her snug butthole. I moaned in pleasure as my dick disappeared into Francesca’s ass one millimeter at a time. Once I finally lodged the head of my prick, she cried out and clutched the sheets. She began to whimper so I stopped and gave her the time she needed to adjust to my girth. 
After a minute had gone by, I dug my thumbs into the meaty globes of her heart-shaped ass and pushed in; I groaned from the delicious pressure exerted around my aching dick. Her rectal muscles involuntarily clamped around my taut foreskin, working to suck the spunk right out of my hefty balls. I kept on going until I was in to the hilt. Once more, I paused a few a seconds, savoring the feeling of being fully embedded inside her warm rectum. 
I gritted my teeth and slowly withdrew my pecker three-quarters of the way out; when the ridge of my cockhead started to become visible, I immediately pushed it back in. After a few tentative thrusts of my hips, no more than a few inches in either direction, I began to develop a nice, steady rhythm. I grunted as I drove in balls deep and groaned when I pulled out to the head. I worked up to a nice, even rhythm. 

For the next five minutes, I fucked her for all I was worth, relentlessly stroking my solid dick to and fro into her gripping sheath; my goal was to enjoy a long fuck, but I wanted to cum so badly that I sped up just so I could get a quick climax: 

"Fuck! I'm almost there, baby” I said in ragged gasps. I felt my balls and abdomen begin to tighten. "Get ready . . . Here . . . Here it comes." I sunk my shaft to the hilt, threw my head back, and screamed as thick ropes of scalding cream shot deep into her bowels. 

My face twisted in agonizing ecstasy as I cried out with the force of my orgasm; more and more of my sticky spunk coated the walls of her teenage rectum. Gut-wrenching waves made me cum harder than I ever have before. When the last of my jizz spewed from my turgid prick, I collapsed on her back with a satisfied sigh.

After my breathing returned to normal I pulled out of her striated hole and watched my watery semen slide down to her pussy before dropping to the bed. Talk about breathtaking.

“Okay, Francesca, a deal is a deal. I won’t show mom and dad the copy of the picture of you fucking Mr. Hayward.” 

Mr. Hayward happens to be my sister’s history teacher. I found out about their relationship when I read Francesca’s diary.