A young couple smooching in the park

Carly lay on the cool plastic of the playground slide, her boyfriend, Tyler, on top of her. They were passionately kissing.

Making out in the park seemed wrong, especially in the playground. But maybe that was what made it feel so good. The thrill and the shock of the moment and everything.

She and Tyler had been dating for two years. Marriage was on the horizon, not that it mattered much. They had lived together for one of those years and already had sex several times.

Carly for her part was quite the catch. A little on the bigger side, but in a shapely and attractive way. She had a model's face, all supple curves and smoldering eyes, framed by luscious dark blonde hair. Her chest and ass were full and big. So what if she carried a little extra weight here and there?

Tyler reached under Carly's skirt and pulled her panties down. Carly lifted her full bottom to help in the process. Someone had naughty plans.

Moving back to Carly's top, Started to unbutton the woman's dress, each pop revealing more lush pale cleavage.

Tyler often struggled to understand how he had ended up with such a beautiful woman. Times like this drove him crazy.

Unbeknownst to the couple, the hell worm had picked up their scent and was closing in.

The creature dismissed the male. Makes had a place in the corruption process, but made poor initial vectors. The female was a different story. And ideal host.

Tyler was busy massaging Carly's full tits. Carly moaned and gasped as her boyfriend played with her body, savoring the moments of worship he heaped on her. Neither noticed as the hell worm wiggled it's way up the slide.

The demonic creature sensed Carly's open pussy and moved under her skirt. Without her panties, Carly was completely open and ****.

The young lovers were locked at the lips, eyes closed. Tyler now furiously humped against his girlfriend. The creature took the opportunity and pushed against Carly's nether lips.

Carly gasped as the massive girth filled her. She was surprised as Tyler usually gave her forewarning. And when did he get so big? He felt so enormous it hurt her, something that never happened anymore.

Still, the moment clouded Carly's judgement. She felt the mass moving deeper and deeper into her. Something in her head, very far away, told her that this was wrong. It didn't feel like Tyler inside her. It didn't even feel human.

Still, she felt her boyfriend's hot breath on her own, felt his hands kneading her breasts, his hips crushing against her own.

Then the creature slipped inside of Carly completely. The young woman's eyes shot open in a solitary moment of horror and realization. This was NOT her boyfriend. This THING was in her. All the way in her and moving deeper!

Then the hell-worm jabbed two tendrils into the walls of Carly's vagina and pumped a healthy dose of demonic venom into her body. This venom, a fast acting infernal substance, acted to both subdue Carly's emotions and mind as well as more heavily arouse the girl as well.

Within three seconds, Carly felt her resolve slipping away. She was fully aware of what was happening to her, she just could not manage to fight it. Her body was swept away by the lustful sensations and soon the young woman was back to her pre-coital rhythm with her boyfriend as the hell worm completed its invasion.

Once the worm reached Carly's womb, it started to dissolve into a mass of tendrils and black, corrupting goo. It's various tendrils dug into Carly's flesh, finding veins and arteries to run through. Within mere minutes of the invasion, networks of thousands of demonic tendrils and veins ran through her body, inextricably bonding her with the invading creature.

The rutting pace of the couple increased as Carly began to react to her transformation. Her body started to change as more dark influence bled into her.

First, Carly's breast swelled in Tyler's hands. This startled the young man and **** him to look down at his girlfriend's changing body. Carly had never been small in the chest department, but now she was growing massive. She easily could fit an F-cup after this growth spurt, and her tits were far perkier than before.

The extra fat on Carly turned to muscle, giving her formerly soft body a hard and chiseled feeling. Her hair lengthened, becoming wild and discheveled. Her already beautiful face took on an almost supernatural allure.

Carly's womb was rapidly reworked to produce corrupting fluid while tentacles formed as a means of transmission and...feeding.

Carly purred like a cat in heat.

"Come on big boy, aren't you going to stick it in?"

Tyler didn't need to be asked twice. He shoved his cock deep into his girlfriend's waiting pussy. It felt strange as he entered. Different in some undefinable way.

As the couple started to fuck, Carly's corrupted body started to react. Tentacle slid down from her womb and encircled her boyfriend's penis. Microscopic spines on these tentacles injected toxin similar to that which had subdued Carly earlier into the base of Tyler's cock.

This made the man harder and bigger, yet staved off orgasm. Next, Carly felt a bigger tendril flow down and encapsulate her boyfriend's penis head.

In an instant, Carly awoke to her new purpose. She felt the raw sexual energy of her boyfriend pulsing within her. She fucked him harder and felt that delicious sexual honey flow even more.

The formerly beautiful woman now looked like a goddess, her body warped by potent lust magic. Tyler came, shooting a massive burst of energy into Carly that she savored like a delicious cake.

Tyler tried to pull away, but found he couldn't. He could now tell that something was very wrong with this situation. He was still hard. Still fucking his girlfriend, only, she was different now. Unreal.

Another load burst from Tyler's cock and he felt his strength leave him. Meanwhile, Carly swallowed every last drop into her tentacle.

Over and over again, Carly took her boyfriend and with each time, the young man got weaker and thinner as Carly grew more radiant and powerful.

Carly's body changed with every burst of cum. She grew taller, now standing well over six feet. Her lithe muscles swelled and strengthened.

Carly felt her boyfriend shoot one more load before passing from the mortal plane. This dying ejaculation shot through her like an adrenaline injection.

Carly doubled over in pain as two thick tentacles emerged from her back, each one tipped with a cock head dribbling black seed. Carly's eyes blazed into a glowing purple and sharp canines formed in her mouth. Her tongue grew longer and ended at a point where a stinger formed.

Carly stared down at the dessicated corpse of her former boyfriend.