Konosuba: Sylvia's Return! NSFW 18+ (Patreon)

*Warning this story has NSFW content. All characters are 18+, legal age for this story and after the transformation, they are not related by blood. They just look the same. If you are not into reading NSFW stories please do not read this story. If you read past this point you are agreeing to find no fault in the story. This is to make sure that the warning is understood. Continue further only if you are certain that you will enjoy NSFW content and understand that this is not underaged sexual content.*

“Ka-zu-ma~,” Sylvia’s sweet but dark voice rang throughout the mansion. Aqua, Darkness, and Megumi were out of town for the last few days, leaving Kazuma all alone to watch the mansion. Little did he know that Sylvia had survived their last encounter and was eager to meet the one that she loved ever so dearly again~.

She had waited patiently, bidding her time, waiting for the moment that he would be alone and make him hers again. Though this time she had no intention of fusing with him, since this time she had something better plan~.

“…No… it can’t be…” Kazuma was shocked to hear her voice again. He truly did love her perfect body, but if it wasn’t for her third limb they could have been together. Though this was no time for him to remise on the past. Now was the time for action. He knew that she was somewhere in this mansion, and the girls were gone. He was all alone. There was only one thing that he could do… run!

“No, no, no, no, no!!!! Why does this shit always happen to me!?” Kazuma yelled at himself, trying to make his way to the exit. It had been a full year since he had last seen her and he had hoped that would have been the end of it all, but he was wrong!

“Ka-zu-ma~. Where are you running sweety~?” Sylvia asked, her sweet voice echoing throughout the halls, but Kazuma had no plans of stopping now. He need to run before she caught him!

“Shut up you futanari bitch! I will not be tempted by your voluptuous tits again!” Kazuma yelled, running faster down the hall. He was almost to the exit and there was nothing that she could do to stop him. Or at least that was what he thought.

Unfortunately for Kazuma, the moment that he reached the front doors, she dropped down in front of him. Her massive tits jiggling in the air.

“Fufufufufufu~. Oh Kazuma how I have missed that vulgar mouth of yours~,” Sylvia said looking at Kazuma with a lustful glare.

“Shut the fuck up you bitch! There is no way that those… those mouth… mouthwatering breasts are fooling me again!” Kazuma yelled, trying to hold onto his sanity. She had the biggest tits that he had ever seen and if he didn’t know better than last time, he would instantly jump toward them. Though he knew what lay between her legs beneath that sexy crimson-red dress of hers. “Get the fuck away from me!”

“Aww, it would seem that I caught Kazuma in a bad mood~,” Sylvia said, clearly not going to listen to him. “You know there are some places that punish those with naughty and filly mouths by placing a bar of soap in their mouths. Though I do believe that what I have would taste much better, don’t you agree~?”

“No, no, no! Shut the fuck up you freak!” Kazuma yelled at her, losing his cool. He wanted nothing to do with this bitch and that was even mouth so now after what she had just said to him!

“Tsk, tsk, tsk~. And here I thought we could cuddle a bit, before getting to the fun part~,” Sylvia said. While it was disappointing to see her dear Kazuma react this way to her, she knew that there was nothing that she could do to change his mind right now. Though in a few seconds that would easily change~.

“Fuck you I’m out of here!” Kazuma yelled trying to run towards the open window, but his attempt at escape was in vain.

SNAP!

With a single snap of her fingers the ropes that Sylvia brought with her, tied themselves around Kazuma binding him in place!

THUD!

Kazuma fell to the ground as Sylvia slowly walked over to her prey. She was dying to get her hands on him and there was nothing that he could do to stop her now~.

“No! Stop! Let go of me you futanari freak!” Kazuma yelled as Sylvia shoved him in between her breasts. He may call her a futanari now, but that was all in the past~. He was dealing with the new her now~.

“Fufufufu~. Oh Kazuma you do know how to turn me on~,” Sylvia said, slowly walking back upstairs towards Kazuma’s bedroom~.

“No! Let me go!” Kazuma yelled, trying to escape, but her binding magic and fat tits were too strong for him~.

When she finally carried him back into his room she tossed him onto his bed before stripping down, even taking off her sexy lingerie, revealing herself to be 100% female. After she resurrected she decided to be a full woman this time since her lover had that male appendage of hers.

“What! No way! There’s no way that you’re just a woman!” Kazuma screamed in disbelief, trying his best to wiggle away. He still had yet come to realize that he was helpless to fight back.

“Aww, there is no reason for you to be scared~,” Sylvia said, bringing out a small vial filled with pink liquid. She stole this from Wiz’s shop and she couldn’t wait to make him swallow it~. Though before that it was time for her to have fun with this Kazuma before the new one was born~.

DRIP! DRIP! DRIP!

Sylvia poured all of the pink liquid into her mouth, lathering her tongue with the liquid~. She wanted to make sure that Kazuma enjoyed himself just as much as she was going to~.

“What are you doing!? Stay away! Don’t come near me!” Kazuma screamed, seeing her slowly walk towards him. Kazuma tried to resist, but there was still no point in doing so.

“Mmpppphhhh!!!!” Sylvia shoved her tongue right into his mouth, almost causing him to choke a bit as it slithered down his throat! All at the same time, Kazuma swallowed some of the pink liquid!

“Nnnnnnnnnnhhhhhhhh~!!!!!! Ahhhhhh This feels amazing~!” Sylvia squealed with joy, cumming on Kazuma’s legs, as she forced him to swallow the pink liquid. “Oops, it would seem that I was a bit over-eager ~,” Sylvia said back to Kazuma, who was about to throw up from what just happened. “The inside of your mouth felt so amazing that I couldn’t help myself~. I wonder if it tasted good~? You won’t lie to me, will you Kazuma?”

“You bit-!”

“Mmmmmmpppppphhhhhh!!!!” Kazuma tried to insult her, but before he could she shoved her tongue down his throat again!

“You like it so much that you want more~! Oh Kazuma, what a naughty boy you are~,” Sylvia said back to him, teasing him, giving him yet another breath moment of air as she saw the roots of his hair already turning the same shade of brown as hers, with the tips of his hair slowly being highlighted red~.

The pink liquid that she forced her dear Kazuma to ingest was a twining potion. It would slowly transform Kazuma into an exact copy of her as she made sweet tender love to him~! Wiz was a fool to try to hide this from her.

“Mmmmmppppphhhh!!!” Kazuma.

“Quiet you bitch~! I know you love this~!” Sylvia yelled, forcing her tongue further down his throat, causing him to see spots! At the same time, his hair grew longer and longer until it was exactly like Sylvia’s. Seeing this Sylvia grabbed Kazuma’s hair and pulled back at it, making her lover suffer for trying to fight back!

“Nnnnnnnn~!!!!” Kazuma accidentally let out a moan of pleasure as his eyes change color, becoming purple, just like Sylvia’s!

Seeing that her toy was starting to enjoy itself, she gave him another chance to show his gratitude to her.

“Ack-ack! Y-you bitch… how dare you!” Kazuma yelled at her, trying to disregard the feeling of pleasure that he felt. There was no way that he could have liked being French kissed by someone like her!

“Kazuma, please there is no reason to fight this~,” Sylvia said gently to him. She knew that her personal fetishes were already filling his mind and there was nothing that he could do to stop it~.

“Shut the fuck up you bitch!” Kazuma yelled at her.

“…Fine, you want to have it rough then we’ll have it rough~,” Sylvia said in a more masculine voice.

RIPPPPPP!!!!

Without warning, she canceled her binding spell on Kazuma and then ripped off all of his clothes! He was left butt naked on his bed, with his tiny little boner showing.

“Your words may say that you hate this, but your body can’t lie~,” Sylvia said in her normal gentle voice while licking her lips. “You want this~. There’s no use in denying it, so just relax~,” she said before pushing him down onto the bed crawling on top of his body, and shoving his tiny dick inside of her pussy~.”

“Ahhhh~!! That’s the feeling I’ve been waiting for this for so long,” Sylvia said, leaning in closer to him.

“S-stop! W-what… what are you doing now!?” Kazuma yelled at her, as his mind started to get fuzzy. He was scared, but for some reason excited at the same time! This was the first time in the 18 years of his life that his dick was inside of a woman and he didn’t know what to do!

“Shh, good whores don’t talk back~,” Sylvia said to him

“You- ahhhhhhhhh~!!!!”

Sylvia started to ride his dick back and forth, causing his body to automatically cum from experiencing a form of pleasure that Kazuma had only ever dreamed of~! All at the same time she began to pinch his nipples~! She leaned in while still continuing to ride him, slowly biting his earlobe as she rejoiced to see him start to lose himself in the pleasure~.

“Nnnnnn~!!!” Kazuma cummed as Sylvia continued to ride his dick. The more she did the smaller it become. At the same time, Kazuma’s pale white skin was getting darker.

“Nnnnnnnnh~!” Kazuma couldn’t help himself from moaning out in pleasure as Sylvia continued to grope his chest, pinching his nipples allowing a pair of breasts to start to form, becoming bigger and bigger with each grope until they were the exact same size breasts as her own~! All at the same time, his skin started to turn a light brown, becoming the exact color of her skin as well!

Kazuma could both see and feel the changes happening to his body and it was absolutely terrifying, but he could stop himself from cumming inside of her once again due to the sheer pleasure that Sylvia giving him. Normally he would be disgusted by this, but her fetishes had already fused into his mind, making his body want more, even if he did not~.

“Ahhhhh~! Ahhhh~!” Kazuma moaned out in pleasure over and over again, exciting Sylvia who shoved her tongue back into his mouth, making his mind start to become extremely fuzzy, filling it with nothing but pure sexual ecstasy.

“Nnnnnnh~! Ahhhhh~! Ahhhhhhhhhh~!!!!!”

Kazuma’s mind was mess right now, torn between hating being fucked by Sylvia and loving it! Seeing that her love’s transformation was almost complete Sylvia cummed out of joy the moment that Kazuma’s flat ass transformed into a nice bouncy bubble butt~!

“Mmm~. You’re almost there sweety~,” Sylvia said to him, as the feeling that his dick was almost gone. Once more cum and it would be gone and there would be no going back~

“Nnnnnnh~! Ahhhhh~! Ahhhhhhhhhh~!!!!!”

Kazuma continued to cum as his dick disappeared and a fresh virgin pussy replaced it, welcoming him to the world of womanhood!

“Nnnnnnh~! Ahhhhh~! Ahhhhhhhhhh~!!!!!”

Kazuma’s mind shattered, as memories of being Sylvia’s twin sister began to fill her mind fusing with her memories of being Kazuma. She was Komi the twin sister of Sylvia~! She knew that she was once Kazuma, but she didn’t care, she loved knowing what her sister did for her and it turned her on~.

Seeing that her new sister needed a reward Sylvia used her magic to create a giant dildo, to fuck the lights out of her twin~!

“Ahhhhh~!!!!!!”

Komi loved her new form and couldn’t wait to make her sister feel as good as she did now~. The two twins continued to fuck throughout the night. When they woke up the next morning they were drenched in each other's cum.

“Oh sister, last night was amazing~,” Komi said to her sister, squeezing her fat tits against her sister ~.

“Same we should go again~,” Sylvia said, eager for another round, though it would seem that they would have to wait.

-2 Days Later-

“Sylvia you and your sister have done well~,” The Demon King said inside their home which was formerly Kazuma’s mansion.

“The heroes here are pathetic and must be dealt with before they become a nuisance. You all have earned my praise for accomplishing setting up a base here. For your reward, you may ask me for anything within reason.”

“Demon King you are too kind~,” Sylvia said back to him. “All we require is each other, so we request that after you take over the world that this small corner of the world becomes ours to manage.”

“Hahahahahahaha!!!!” Sylvia you and your sister truly understand your place! Your wish is granted! Now let’s make these pathetic heroes pay for ever thinking that they could dare defy us!”