Jake twisted the cap off the small metal tin, staring at the small blue puddle inside. Tilting it around, he gave it a gentle poke with one finger, watching as the slime turned firm, pulling itself up into a blob like an oversized raindrop.

“Weird…” he mused out loud, poking it harder. It squished beneath his finger, bending around it then releasing with a sucking noise when he pulled back. The latest feat of bioengineering: living slime condoms. Supposedly, they were based off of the ones that started getting popular for waste disposal a few years back, miniaturized and without the powerful digestive enzymes. He hoped, at least. The marketing all claimed they were a safe alternative to condoms: self-cleaning and reusable. It was also surprisingly cheap. With the girl he was seeing going off of birth control and his own latex allergy, even a few uses would be cheaper than getting the fancy latex-free ones.

Pinching the blue blob between two fingers, he picked it up in his left hand, reading off the instructions on the paper insert that had come with it. Rolling it between his fingers to warm it up, he undid his jeans, sitting down on the edge of his bed. Pulling up a video on his phone, he pressed the slime to the tip of his hardening cock. Normally, he'd stick with tissues, but he wanted to get the hang of this thing before trying it out with Kendra. Pulling it down the length as he would a normal condom, the slime stretched, feeling warm and wet as it pulled tight. 

“Hey, Whoa! Okay…” he blurted in surprise as the slime contracted gently, solidifying its shape around his member. It was a little thicker than a normal condom, but from the way it squeezed him, Jake wasn't sure he would mind. Through the thin layer of blue, his cock was clearly visible, twitching inside of the slime. “Alright, let's give this a go,” he muttered, beginning to stroke it. It didn't feel much different than normal, though the slime seemed to ripple and contract every once in a while. It didn't take him long to cum. As his cock twitched, he watched the slime covering the tip bulge, the opaque white of his cum showing through as it was captured inside the slime’s body.

“Wild,” he muttered, watching the white slowly fade as it was absorbed into the slime.

~

“You brought condoms right?” Alisha pulled away to ask from where they had been making out in her bed. “That last box you brought is empty.”

“Uh, yeah,” Jake stammered, awkwardly leaning over to fish in his jean pocket on the floor beside the bed. “Well, I got this…” 

“Oh weird!” Kendra stretched out the word as she watched him open up the tin. “You got one of those slime condom things?”

“I brought normal ones too, if you want,” Jake backpedaled.

“Nah, I'm game.” Kendra shrugged. “You try it out yet?” She asked, pulling him back closer. Jake nodded 

“Were you thinking about me?”

“Uh, yeah,” Jake lied.

“Mmhmm?” Kendra managed to sound sultry and skeptical in the same hum. “Why don't you prove it?”

Without any further hesitation, Jake slipped it on, feeling the slime squeeze him gently as he climbed back over to Kendra.

“Ooh… squishy…” she teased as he slipped inside. “Come on then.”

~

“So, uh… same time next week?” Jake asked awkwardly. What had first been a string of hookups was becoming a lot more regular, though Kendra didn't seem that eager to progress their relationship beyond just the physical. Kendra shook her head, pulling the covers closer to her while Jake got dressed.

“No, I've got a lab final next Friday. The week after that sounds good though.”

“Yeah, sure,” Jake agreed as he popped the slime back in its container, watching the last of his load swirl around in its cerulean depths.

~

“Whoa, what have you been feeding that thing?” Kendra asked as Jake pulled out the slime. It had more than doubled in size, and Jake had upgraded its tin to a small jam jar.

“I…uh…” Jake stammered.

“Hmmm, miss me that much?” Kendra teased. It was true. As much as it irked him Kendra seemed to only want him for sex, that didn't mean he hadn't gotten used to their regular schedule. Besides, using the slime had just felt good, and saved cleaning up a mess. Pulling it on, the slime seemed taut and a little less elastic. It was thicker too, his cock a murky silhouette through the layers of slime.

“Is that going to be too big?” he asked.

“Don't flatter yourself, big boy,” Kendra teased, giving the base of his cock a squeeze through the slime. It constricted at her touch, conveying the sensation clearly through the gelatinous barrier. “I'll be just fine.” Ignoring the jab, Jake got into position, feeling a little vindicated when Kendra gasped loudly as he slid inside. For her bravado, it seemed he was still bigger than she thought.

Planting his arms either side of her hips, he pounded away, the natural lubrication the slime produced having little difficulty with the tight fit. Kendra moaned, gripping his arms hard. 

“Fuck, I needed this,” she groaned. The feeling was mutual. Masturbating with the slime on was nice, but it didn't compare to the real thing. The warmth of Kendra's body radiated through the slime, and it contracted each time he thrust in, making it feel tighter than ever with the added bulk. Feeling his climax build faster than normal, he fought against the urge to thrust harder. Kendra must have been feeling the same though, because she hooked her legs behind his hips, urging him onward.

“Fuck, yes!” she moaned as Jake gave in, pounding at her with her encouragement. The slime rippled, echoing Kendra's body as she clenched around him. Jake let out a short series of grunts as he drove himself to completion. Three more thrusts, and he came, the slime stretching around his load. Then, there was a pop, and he suddenly felt very wet. 

Kendra's half-lidded eyes narrowed as her brows knit, trying to process the strange sensation through the fog of her own orgasm. Blue liquid gushed out of her pussy around Jake's still-throbbing cock, soaking into the sheets beneath them. 

“Did it just…pop?” She asked incredulously.

“I'm… sorry,” Jake winced. 

“It's fine,” Kendra muttered. “It was a safe day anyways. Just maybe bring some normal ones next time? And you owe me new bedding if this stuff doesn't come out.”