Sudden Genderbend

Shadow huffed in relief: Rouge didn't found out about him having an affair with both Cream and vanilla, but now he knew that he needed to spend some time with the busty bat in order to not make her suspicious. With these thoughts, and the epic threesome he had with the two bunnies, in mind he headed to Tails's house, where he was supposed to work on a new stealth tech for Rouge. The Ultimate Lifeform grunted a bit: Tails was a genius, but the fact that Rouge had an interest in him made him very jealous. Plus, the fox had almost an obsession for huge breasts and breast growth and pretty much all of his researches revolved around that topic, but that was something that only Shadow and Rouge knew as the others had no clue of Tails's... passionate interest. He walked in, only to find the place completely trashed and covered in smoke. He coughed and opened the windows, trying to let it out, then he looked for Tails, hoping that he was still alive and that nothing bad happened. “Cough... Cough... Tails? Tails, are you ok?” he asked, while coughing due to the smoke, then he felt a whimper and he ran to Tails's laboratory, where the sound came, and found even more rubbles and smoke. He waved his hand in the air and saw his feet coming from under a girder. He grabbed the girder and pushed it up, throwing it away, and dragging Tails outside. That's when he noticed that he felt heavier now, for some reason, but he shrugged and carried the young genius to safety. He went out of the house and layed him on the grass, then he got up and cracked his back “Damn, Tails, for a small boy, you're surely... Heavy?” he said, noticing that his ass was now extermely plump, just like Rouge's, along with his thighs and now he seemed to be taller. He raised a brow and decided to turn him over. What he saw made him drop his jaw: he had grown a pair of huge breasts, which flopped a bit as he was turned on his back, his waistline had shranked and his hips were bigger. He gulped, as he now had the same physique of Rouge, and decided to spread his legs, seeing that his dick had been replaced with a pussy. There were no doubts: Tails was now a girl! No, not a girl, but a woman!

The genius groaned and woke up “Uuuugh... Didn't saw that coming... Oh, hey Shadow, what brings you here?” Tails asked, seeing him “T-Tails... Are you... Are you ok?” he asked, folding his arms “Yeah” she said, shrugging “You sure? You don't feel... Weird?” he asked again “Nope” she replied, shaking his head and getting up “Whew, what a rush! I got up too quickly and now I'm dizzy!” she said, that was Tails's voice, only more womanly and, somewhat, sexy “You ok, Shadow? You looked like you've seen a ghost...” she asked, placing her small hands on her huge hips “I... Uh, how do I say it... You realize that... Y-you are...” he started saying, then Tails smiled “A woman? Well, duh!” she said giggling “Wait, what?” asked The Ultimate Lifeform “This was all part of my latest experiment for stealth: a shapeshifting device” she explained “It lets you turn into anything you want” she said “So, you became a Rouge-like version of yourself?” asked Shadow, huffing “Yup, but unfortunately the machine had a problem and bursted, hence why the chaos...” she said, almost like if it wasn't a big deal “And... Shouldn't you be worried? I mean, you don't want to look forever like this, right?” asked Shadow “No, of course not. Have you any idea of how heavy these things are?” she asked, cupping and weighing her huge boobs “Or this?” she asked, turning on her back and groping her own asscheeks. Shadow blushed a bit: how could she not realize that what she was doing was extremely lewd? “But the problem is that I don't have the materials to rebuild the machine, and those are very expensive...” she whined a bit. Shadow sighed “Well, put on something and come with me at G.U.N. We'll explain it to the boss and everything will be fine again” he said, starting to walk back to the HQ but Tails grabbed his arm “Uh... Actually... There's another problem we gotta take care of...” she said, looking down and blushingm madly, rubbing her thick thighs together “I'm almost afraid to ask, but... What is it?” he asked, then he saw his arm vanish in her boobs “I'M. SOOOOOO. HORNY!” she moaned, lust could be seen in her eyes and heard in her voice as she pinned him down. He gulped a bit as he wasn't prepeared for that “I-I don't know why... But right now, I f-feel so hot... In here...” she said sitting on his belly and showing her pussy, he could almost feel her heat radiate on his face as she widened it, allowing him to look inside “W-well... It seems that your transformation messed up your hormones, somehow... But if I gotta do this, I'll do it my way, ok?” he asked, pushing her off. Tails nodded fast “Yes! Yes, please! Anything to feel better!” she moaned, to which Shadow grinned “Aaaaand it starts...”

Shadow sat on Tails's thick lap and started by groping her luscious tits, making her bite her lip and clench her fists as her boobs were highly sensitive “Mmm... So soft and warm...” said Shadow, grinning and fondling her boobs, causing her to wag her tails and moan more “Mmmnnn... Y-your hands are s-so big...” she cooed “I was gonna say the same about your knockers over here...” he whispered as he rubbed and caressed them “Say, did you planned to turn into a woman? Because you wanted to see how it felt to have huge boobs?” he asked to her. She bit her lip and nodded “I-I really have no reason t-to deny it... My obsession with b-boobs brought me in t-this... A-and it feels s-so good... I love this... Please, d-do more naughty stuff t-to me and my h-huge tits...” she moaned. He smirked, acknowledging of how sexy she sounded, and groped her tits more, his fingers sinking in her titflesh. Suddenly he took her tits and shoved her nipples in his mouth, sucking on them fast and hard. Tails moaned, closing an eye, as she felt Shadow sucking her nipples while he squeezed her right tit with his hand. And the left one? Well, Shadow shoved it in her crotch, fingering her wet pussy as he treated her tits “A-AHN!!” Tails moaned loudly, feeling his fingers wiggle in her baby-making channel “T-this is... Aaahhhnnn...” she moaned as she started to feel very warm inside her womb. She gritted her teeth as Shadow was rewarded with sweet, warm milk trickling down his throat. He looked at Tails, raising a brow but not stopping his sucking “W-what? I-I programmed my tits to have m-milk...” she whined, looking away a bit. Shadow grinned and pushed his fingers more into her vagina, making her moan, while sucking hard her tits and drinking their milk, until Tails couldn't hold on anymore and came, wetting Shadow's hands, and also lactated in his mouth. Shadow drinked all of the milk and pulled away, showing her how hard he now was “Your body is too sexy and irresistible...” he said grinning as he pushed his dick between her tits and rubbed them on it. Tails moaned as she felt the hot, thick thing buried in her boobs, and grabbed Shadow's hands to help him rub his dick between them. He grinned “You like this, don't you?” he asked smirking and titfucking her “M-MMMM...” she just moaned, blushing and sweating a lot as the titfuck went on. “Your tits are so big and fat that they've swallowed up my dick. I can't even see it... It feels so good, it's like a living being hugging my dick in softness...” said the ebony hedgehog as he went faster “NH! NH! N-NOT SO F-FAST... I'M... I'M... NNNGGGHHH!!!” she whined, gritting her teeth and cumming a second time. However Shadow didn't stopped and kept fucking her boobs until he came inside them “Nrrrrrrrgh...” he grunted as he released his load in her boobs. Some managed to spew out of her cleavage and landed on her boobs and face, making her pant and lay down “H-hah... Hah... S-so hot... Stinky... A-and thick... I love it...” she moaned, licking it off her cheeks, then she got up and tackled Shadow, pinning him down again “I need more...” she said, completely lustful “How about this? Whoever cums first has to be at the bottom and do everything that the winner wants...” she said, before turning towards his groin and pressing her pussy on his muzzle.

Shadow moaned as her hot pussy was pressed on his face and he felt her boobs wrap again on his dick, only this time his tip was showing out. Tails licked her lips and took the tip in, sucking it as she massaged the neck of his dick with her huge tits and pressed her juicy-leaking pussy on his muzzle. Soon Shadow groped her fat asscheeks and shoved his tongue inside her vagina. She moaned as she felt the slick muscle in her pussy but continued to suck as the two got entwined in a super sensual 69 pose, each trying to overpleasure the other. However, despite receiving both a blowjob and a boobjob, Shadow had more skill at sex while Tails was still a virgin, so far she had only managed to get boobhugs by Rouge to which she'd jerk off when she was still male, but she has no sexual experience, though her sucking technique was not bad for an amateur. Shadow kept her nice and steady on his face, eating her pussy up as he started bucking his hips in her mouth and tits, makign her moan as she struggled to hold it together. (Mnf... It's so big, warm and thick... I can barely fit it in my mouth...) she moaned in her mind as she rubbed her boobs on his dick, hoping to make him cum before her so that she could be at the top. However, Shadow had one last trick up his sleeve: he shoved his whole fist up her ass. This caught her off guard as she moaned and came on his face (Aw, darn it...) she whined. Shadow grinned and let go, cumming deep in her mouth. He pushed her off and grinned “I won, so you have to do everything I say... And i say...” he said getting up and pulling out an all too familiar syringe for Tails, then injecting his penis with it, causing it to split in too “Have a taste of your own medicine...” he grinned, showing her how good he had becomed at using the twin serum “O-oh my...” she moaned, gasping as she wasn't expecting for it to be used against him. He moved closer and pushed his dicks right inside her nipples, causing hr to moan in pain and pleasure as she felt them fill her milk channels “N-NNGGGHHH... S-SHO B-BIGGGGG...” she moaned “Hehe, like how your own formula works?” he asked smirking and thrusting inside her boobs immediately, not giving her any chance to catch her breath after cumming in her mouth “AHN! AHN! AHN!” she moaned, loving the feeling of being fucked in her tits by two dicks created by her own doubling formula. Shadow grinned as the insides of Tails's tits felt amazing and kept ramming them as hard as he could, hitting her tits's deepest spot and moaning as he got closer to cumming. He gritted his teeth and slammed his dicks in her nipples, cumming and pouring his huge load inside them, making Tails yell in pleasure. She fell down, panting and with her tongue lulling on one side of her mouth, then she felt a slight pinch on her pussy and saw Shadow smirking and with a cyan syringe

“W-wait... T-that's my... My superfuck serum...” she moaned “Your what now?” he asked “I-I made it to w-work with the double dick f-formula... It makes every hole it's injected in more malleable... Wait, did you just injected me with something and you didn't knew what it did?!” she asked, trying to get up but Shadow pinned her “Yeah, right... I know that all you can think about is sex, so every trinket or potion or watchmacall it in your house is sex-centered...” he said, grinning as he topped her “...Wow, am I that easy to read?” she asked, raising a brow, then she felt both of his dicks pushing against her pussy “So, now your pussy is more malleable? Works for me...” he said, smirking and pushing his dicks inside her vagina, despite the ease that they went in, her pussy still felt extremely tight and she was assaulted with a huge wave of painful pleasure as she gritted her teeth and moaned wildly “Ready to be rammed? I don't care what you answer, Imma still do it!” he chuckled and started banging her hard and fast, hitting her deepest spot already and rubbing against her folds “MNGH! AHN! NNGGHH!! OOOMMMPPPHHH!!! F-FUCK, YES! F-FUCK ME! FUCK MEEEEE!!!!” she moaned, covering her eyes with one arm as she cried in bliss and drooled due to how good it felt “Ngh! Ngh! Take this! And this! Yeah, your pussy feels great, you little freaky nerd!” Shadow moaned, continuing to fuck her tight vagina, then he leaned on her and groped her tits again, massaging them hard as he humped her “SHA-SHADOW!! SHADOWWWW!!!” she moaned louder, lots of juices came out of her vagina and she lactated again “Geez, you're such a messy slut...” he said, sucking her boobs again while fucking her hard, the sloppy sounds became more intense as he drew closer “Mngh... G-gonna cum soon... Maybe I should...” he said, trying to pull out, but Tails's tails wrapped around him, keeping him in “D-DON'T WORRY, I W-WON'T GET P-PREGNANT... J-JUST CUM INSIDE...” she moaned “Oh... Well, in that case...” he said, grinning and slamming his dick inside her pussy,pouring a huge, fat load inside her, making her moan loud and lactate harder. As his cum stopped pumping inside her, she let go of him and made him fall face first in her boobs. He hugged and nuzzled with them a bit, then he got up, smirking and taking his phone “W-who you're c-calling?” she asked, panting “You'll see...” he giggled as he called Rouge “Bat? Get your ass here. You won't believe your eyes...” he said, looking at Tails while smirking as she passed out...

The End?
