A different kind of birthday gift

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This is the first TF story I've ever written! It was crafted with the help of a friend, and I hope you enjoy it. Feedback is greatly appreciated!

Slick: me

Arjo: https://www.furaffinity.net/user/grishi

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"I got you something very special for your birthday," said Arjo, an evil glint in his eye. He reached into a pink and blue bag and pulled out a pair of bottles, handing them to the Cabbit next to them.

"What are these?" Slick asked, eyeing them suspiciously.

"They're gender fluid ™?. I know you came out as nonbinary recently, so I thought you might want to see what sex feels like for the other half of the world. The pink one turns you female, the blue one turns you back. Of course, you don't have to drink both if you don't want to."

Slick sat speechless for a few moments, then in one rapid move uncorked the pink bottle and swallowed the entire contents with one big gulp.

Arjo yelped

"Whoa whoa slow down a second! The guy who sold me these told me there's some side effects. It puts you into heat, like REALLY into heat. Something about making up for lost time"

Slick gave Arjo a nasty look

"You couldn't have told me that before you handed them over?"

"Would it have stopped you?"

"No, probably not"

"You should probably strip down a bit, so you can watch," said Arjo with a lecherous grin.

Slick obliged, watching as some of the muscle had already begun to disappear from their arms.

"This feels kinda weird" they said, gasping as they accidentally brushed a hand against their nipple

"God that's sensitive" they said as they started to toy with them.

Slowly but surely, their chest began to expand. Areola expanding, nipples elongating, carried forward by an ever-growing pair of mounds. Soon they were passing B cups, and as Slick began to squeeze them, they felt a jolt in their crotch.

They moaned as their waist began to thin, hips popping as they widened until, with a snap, the elastic on their underwear snapped.

As all this was happening, their dick sprang out and started drooling with pre. Instead of getting bigger, though, it was getting smaller.

Suddenly, their breath caught and they started cumming.

Five spurts, then ten, then twenty, with each their dick got shorter, and their balls got smaller as both pulled closer in to their body.

Finally, after thirty shots, their balls disappeared into them and they could feel them burrowing deep, opening a passage behind them before settling in their new home, as ovaries. As their dick finally stopped shrinking and settled as a small but incredibly sensitive point, their new lips split open.

Immediately Slick felt a dampness in their crotch, along with a warm, pulsing heat. It actually felt kind of pleasant. They ran their fingers over them, feeling the wetness soak the fur on their hands. With a start, they realized that while they were distracted by their orgasm, the rest of their changes had finished. Their breasts had settled at a perky double D, with thimble sized nipples and areolae the size of silver dollars. Their hips were almost half again as wide as they had been, but their shoulders were slimmer. Their eyelashes had gotten longer, and their muzzle was slimmer. Slick walked over to a mirror and barely recognized themselves.

"Wow, that was, interesting. I don't think I went into heat though, kind of disappoint-WOAH"

Slick almost fell over as they felt a sudden, churning, clenching, needy inferno erupt inside their new pussy. Their breasts ached and swelled a little as their nipples suddenly stood at attention, rock hard. As they massaged them, their vagina suddenly clenched, sending a torrent of wetness down their thighs.

"Oh fuck, oh FUCK" they moaned as they desperately started to finger themselves. There was a deep need inside of them, and as they pawed at their pussy it only got more and more intense.

"Oh fuck Arjo, I need you. I need you more than I need to breathe. I need you to breed me" Slick managed to say between moans. Their clit was on fire, pussy winking and gushing with fluid as they tried desperately to cool the fire inside them.

"Are you sure?" asked Arjo

"Fuck it, I need a good dicking and I need it NOW"

Slick pounced on Arjo, leaving a trail of pussy juice leading away from the puddle where they'd been all the way to the couch.

"Hold on, do you want me to grab a condom? You don't wanna get knocked up your first time as a woman do you?"

Slick looked at Arjo desperately and growled as they clawed at Arjo's pants

"No, I need your cum. I need it inside me as deep as you can get it"

Arjo was already hard and started to pull off what was left of his pants, as soon as they were off Slick hopped on top and slipped his dick inside. They could feel Arjo's pulse throbbing inside them, and started bouncing up and down as Arjo struggled to finish taking off his shirt

"Mmmmmmmmm, fuck I needed this" moaned Slick as they grabbed one of their bouncing breasts and squeezed, sending a jolt of pleasure straight to their clit. Arjo tore the rest of his shirt off and flipped Slick onto their back, growling as he leaned in close and licked Slick's ear, whispering "I'm gonna make you mine, breed you over and over and until your womb swells with a litter of my pups"

Slick let out a high pitched moan as Arjo started pumping into them, their brain basking in pleasure, eager for the relief that being bred would bring and rejoicing in the pleasure of mating. Slick screamed as Arjo's knot began to push at their entrance, smashing into their clit over and over driving them wild. He locked lips with Slick to shut them up. Slick's walls began to clench as they got close to their peak, and Arjo's knot started pushing further and further in with every thrust until finally, with one agonizingly pleasurable pop, it slammed home and swelled into place. Arjo moaned as he started to pump his thick, virile spunk deep into Slick, ensuring they would carry his pups.

As soon as they felt cum hit their womb, Slick came, harder than they ever had in their life, their entire body convulsing with pleasure as their pussy started to desperately milk Arjo for all he was worth, squirting excess cum mixed with their own juices onto Arjo. Arjo came for ten seconds, then fifteen, then twenty, then, after forty seconds had passed, Slick weakly asked him "Why did you pull out?"

Arjo looked down, surprised to see his dick pulling back into him, moaning as a new tunnel opened between his legs, new ovaries already converting sperm to eggs.

"Oh fuck, I think you still had some of that potion on your lips, I'm changing!"

Slick snapped out of their warm, post-orgasmic haze and looked up at Arjo.

Cum drooled out of them as they sat up. Despite their heat being extinguished, they still felt a warm glow deep inside.

"Oh shit! That's kinda hot tho"

Arjo moaned as their changes rapidly accelerated, a pair of large breasts quickly swelling on their chest as their hips snapped into something more feminine in an instant. Within seconds, they were moaning on the floor as their new pussy dripped and drooled, desperate for something to cool their heat.

"Fuck, Slick, drink the antidote I need a dick NOW" yelled Arjo

Slick quickly scrambled to their feet and grabbed the antidote. They knew how Arjo felt, having experienced it a few moments prior, and knew how much they needed relief.

They quickly swigged the second bottle, and waited. Arjo moaned and pleaded for them to hurry up as they desperately mounted a dildo they had found on a shelf in the bathroom, but it wasn't enough. Their body demanded a real cock to breed them, nothing else would suffice.

Slick waited longer still as nothing happened, then checked the gift bag to see if they missed something. They found a folded piece of paper that said

Warnings:

Wash potion down with water or other liquid, otherwise change may be contagious

Wait 15 or more minutes to have sex after changing to avoid unwanted pregnancy

Do not take antidote if pregnant, permanent changes may result

As they read the final line, Slick felt a new burning in their crotch. Their clit split in two, and one of them began to move upward. Deep inside them they could feel their new ovaries split, as a new set of testicles started dropping through their womb towards their entrance. As they fell, they could feel them get bigger, and as they approached their exit, Slick had to strain to push them out. With two thuds they felt deep in their soul, two new grapefruit sized balls fell into a pendulous sack that hung directly in front of their pussy, and their second clit began to quickly grow into a proper, sheathed breeding tool. Within seconds, they had a cock and balls even bigger than the ones they had lost

"Holy shit, I'm fucking HOT."

Slick walked over to the bathroom mirror and started examining themselves. They hefted their orbs as they stroked their shaft, feeling them pulse and throb with untapped potency, until focus was broken by a fresh moan from Arjo.

As soon as they laid eyes on that dripping, wet, and swollen slit, they felt an overwhelming urge to breed. Their dick and balls strained as their balls began to churn and slosh, aching as they filled to the brim, backed up with cum that demanded to be emptied into a warm, wet hole. Slick knew they had gone into rut, and somehow, they knew their balls would never be empty again.

Precum began to stream out of their dick, helping somewhat to relieve the pressure in their balls, but as they stalked over to Arjo, their breasts swelled up another cup size and began to ache, some beads of milk starting to drip from their nipples as more sloshed inside.

As Slick helped her to her feet, Arjo was reluctant to take their hands away from their burning and needy cunt, but eventually settled on fingering themselves with one hand and holding onto Slick with the other as they walked her to the bedroom. As they laid Arjo down on the bed they felt another two points of pressure (and pleasure) swell into being below their breasts, as a second, slightly smaller set swelled forth, already leaking milk.

All four nipples surged forward, growing slightly longer into small teats and weeping continuously as all four breasts lifted up, straining with pressure. Slick grabbed Arjo and forced them onto a teat as they squeezed their others, Arjo continuing to paw at their mound as they drank the sweet, rich milk. Cream sprayed out of Slicks breasts as they kneaded their nipples, breasts sagging back down slightly as the pressure inside them decreased somewhat, but somehow Slick knew they'd always be full, just like their balls.

As Arjo drank, she could feel her clit split off into a new dick, and her ovaries divide, producing a new set of testicles. As she squeezed them out into their sack, she pulled one hand away from her pussy and onto her new dick, glad to see she hadn't lost any size but disappointed to see that she hadn't gained any either.

She pulled off of Slick's breast and flipped onto her hands and knees, spreading herself open for Slick.

They needed no invitation. Despite their raging lust, they pushed in slowly, not wanting to hurt their friend. Their mind was screaming at them to breed this bitch, but they managed to hold back, even if just for a moment. After a few moments, their knot touched Arjo's lips, and they saw stars, and felt their dick jet out an extra thick spurt of precum. It was far more sensitive than before.

Arjo could feel Slick's dick drooling into them as their pussy started to churn and clench, greedily milking out everything it could, but it wasn't enough. Arjo was more filled than she'd ever been in her life, but she needed more.

"Please" she begged, "I need you to cum inside me"

Slick obliged. They started to thrust, slowly at first, before quickly picking up the pace. Their cock burned with pleasure as they quickly their peak. More surface area meant more pleasure, but more pleasure meant it was harder to stave off their orgasm.

Both of them moaned and growled as they mated, and Slick leaned down and nipped at the scruff on Arjo's neck before finding a spot they liked and clamping down. They quickly began to push their knot further and further into Arjo, their instincts urging them to knot her before they came. Arjo could feel the knot pushing painfully at her slit, but she wanted it, no, needed it inside her. She began to push back, helping it in before finally, with a moan of relief, it pushed past her entrance, swelled wide enough that Arjo could feel it in her hips, and locked in place. Immediately, both of them began to cum.

Arjo's whole body shook as her pussy convulsed, squirting profusely onto Slick's crotch as it milked their dick for all it was worth, balls pulling closer to her as her dick fired off shot after shot below her.

Slick, meanwhile, fired thick streams of virile cum directly into her womb, feeding her cunt as it eagerly drank every drop and clenched around their dick. Their breasts surged with pressure, and their nipples began spraying milk all over both of them, soaking the bed while their pussy orgasmed sympathetically, clenching, churning and squirting, soaking their thighs and the floor as Slick's brain whited out from pleasure.

Arjo could feel her heat being extinguished with every spurt of cum, womb swelling with the size of Slick's load.

As soon as it was over, Slick slumped on top of Arjo, then rolled into their back, their knot making Arjo come with them.

Arjo felt her breasts swell with some milk of her own, though her breasts weren't as endlessly productive or achingly overfull and leaky as Slick's. She squeezed a nipple and marveled as a small dribble of milk squirted out.

After a few minutes, Slick's knot had shrunk enough (and Arjo's hole had stretched enough) that Slick could pull out. What seemed like gallons of cum drooled out of her slit, the swell in her belly getting smaller as the excess cum was finally given somewhere to go.

Both could feel that their heat had been replaced with the warm glow of pregnancy, and Slick could feel that his rut was over, as they no longer had the unending urge to breed anything that moved.

Despite this, Slick could feel their balls swell and churn once more as they refilled with cum, and they knew that for the rest of their life, they'd always be ready to dump a load of cum into anyone who'd take it.

Arjo, meanwhile, was half-asleep in a post-orgasmic haze, from which she was rudely awakened when Slick asked "You ready for round 2?" their dick erect and dripping again already.

Arjo replied "only if I can top first"

Slick's pussy began to drool again at the thought, and they moved over to straddle Arjo as the breeding cycle began anew