The Birthmark

No teeth. Just the gums sliding along Sam's dick. The wonderful suction that drew him from flaccid frustration to full chub. This was the sensation that Sam could never capture with any toy, the drool that dripped from those toothless lips to drip off his balls more sincere than any whore he could afford would provide. Sam flexed his abs and looked down at the silver head...glad he had chosen the app, ready to smash this pussy like...

Then his eyes fell on her left shoulder blade, high up. A dark red splash with five small protrusions, like a fairy's hand.

Sam swallowed. He'd seen that birthmark, or one very like it, before. His mother had been adopted, and had spent some time on a failed search for her birth mother. She'd never found her, but she had found a single polaroid of herself as an infant, with her birth mother looking over her own mother's shoulder...and Sam's grandmother had a birthmark that looked just like that one.

His stomach twisted. It was a coincidence. There was no chance. It was just...

"Oooh...somebody got hard all of a sudden," the GILF said. She gave the head of his cock one more lick and stood up on unsteady legs. "Stay just like that, stud...that's perfect..."

She turned around and guided the head of his prick to her grey, fuzzy cunny. Sam gripped the bedsheets as his eyes were drawn over that back, the spine prominent...and there, on the shoulder, the little fairy hand.

"God, I needed this," the GILF said as she settled into his lap and rocked back and forth. "It's been so long...you've got a nice cock too, not too big..."

Her hand reached down between her legs, and he felt the cold tips start to play with his balls, gently squeezing and fondling them. Sam screwed up his eyes as his hips began to twitch in time with her gentle riding.

How the fuck do I even bring it up? Sam thought. Do I ask if she gave up a baby for adoption forty-or-so years ago?

"You up for a bit of roleplay?" She said.

"Sure," Sam said, relieved to have something else to concentrate on.

"Good. Fuck grandma's cunt then, sonny-boy," she said as she gave his balls a squeeze. He was glad, then, that she couldn't see his face. "I wish you could get grandma pregnant. Don't you? Can you imagine me doddering along with my own great-grandchild in my swollen belly? These sagging tits bloating with milk again? Oh, what a nasty little young man you are..."

Inside, Sam screamed...but now his sexual frustration worked against him. All his cock knew was that it was finally in a warm, tight, welcoming cunt. He could feel the throb behind his balls, the pent-up need, the jizz that was about to boil over.

"Oh grandma," he said, the word awkward and bitter in his mouth. "I think...I think I'm going to cum in you."

"Do it!" The old woman groaned, and he could see her free hand between her legs as she rubbed her clit. It was too much. He needed to end this now...and there was only one way to do it.

Sam sat up and grabbed her sagging tits with both hands. His fingers sank into the aging flesh, and she groaned deeply as he began to pump into the old woman on his lap as hard and fast as he could. Using her like a sex toy. His heart was fit to break. Inside Sam derided himself, he was a horrible person...nasty...disgusting...and he moaned through clenched teeth all the dirty things she wanted him to say.

"Gonna cum in you grandma...gonna cum in your hairy old pussy. Knock you up! Make you carry your own great-grandkid. You nasty old cunt, fucking your own grandson. Slutty bitch...horny for your own grandkid...I should tape this so mom can watch and jill off to it...maybe we can do a threesome with her next...knock both you sluts up at the same time, all the same whore genes mixed together..."

Some dark strata of his sexual deviance spilled out with the words, and it sickened Sam to the core...but she gasped...shook...and as he pounded her harder and harder, and her cries grew louder and louder, he finally found his release.

It was the most shameful orgasm of his life. Hot white seed spurted out in long stringy ropes inside the ancient cunt. She kept riding him, her thin, bony thighs on top of his as they both shook from the aftermath of his orgasms...and he found himself staring at the birthmark on her shoulder.

"That was...a good one..." The GILF said. "You know, I didn't...want to bring it up before...because it would be weird. But you look exactly like my first boyfriend. It's uncanny."

Sam groaned inwardly. He didn't know how this night could get any worse.

"You can go again, right? It's been a long time for me, and I figured...well, we have all night, don't we deary?" She put on a quavering old-grandmother-from-a-storybook voice, and a part of Sam's voice curled up and died. His cock was still in her.

"How would you like to fuck grandma next?"