[Jurou-gumo TF, Genderswap, Incest]

"Well, I don't see you here often, dear Ikki. You were here a lot in your youth, and yet you decided that it was best to try and avoid establishments like these?"

"I'm just having a cup of coffee, Gumo. You don't need to make a cup of coffee sound so dramatic."

"You know me, Ikki. You know I can't help myself."

"I do. I've known you for long enough to know that you need to make everything feel like it's the end of the world. Or worse, a matter of love or death."

"Ara, you know me so well. Then why don't you tell me why you're here, Ikki? If you've been trying to avoid me, I might just forgive you and fall in love with you if that's the case..."

In the outskirts of a Zipangu village sat a rather lonesome little hut. A hut that was rumored to house a Spider-type Mamono. But the only person that inhabited it was a simple black-haired woman known as Gumo, who always seemed to be sipping a cup of coffee whenever somebody came by. And if prompted, she would tell the visitor stories about her past, cluing them into her true identity.

Ikki had been here several times. He had been here when he was a young boy, when he started to form a crush on Gumo, and when he eventually started to grow up. And he didn't seem bothered by the fact that she was indeed the Mamono that the rumors spoke of. If anything, he expected it. But due to his lack of care, a relationship was slowly forming between the two. A relationship that would be hard to break, and even harder to see to its conclusion. Because they were from two different worlds. Two worlds that could not come together, lest something horrid would happen...

At least, that's what Gumo always said. Ikki didn't much care for her dramatic words, but he did know that they couldn't be together. The gap between them was too big, and he merely wanted to learn about the kind of woman that she was. Because he needed advice. Over and over, he needed to learn about the woman that she was. So that he could make it through life. It was how he ended up the guardian of the village. And how he ended up in the care of his youngest brother, after the disappearance of his family following the main parts of the region conscripting them into service...

"Please. You've already been in love with me. I know that better than you do." Ikki said, snickering a little as he slowly took a seat across from her. Right before he very nearly planted his face up against the table. "But I wish that I knew my Brother as much as I knew you. I feel like.. I feel like I haven't been able to connect with him since the day that I ended up caring for him. Since the very day that he ended up clinging to me and treating me like more than a brother..."

Gumo smiled from ear to ear. "And you think somebody like me can help you with your family problems? Really, you must've gone half mad. You know that I can only seduce people. It's the only skill that I've been able to nurture and hone over the course of my long life. There's no way that I could help you with something like that."

"And yet you're smiling and mocking me. Which means you definitely know a way to deal with all of this." Ikki said as he slowly lifted his head. "What do you know, Gumo? Please. I need to know how to handle him. I want to understand what I need to do to stop him from rebelling against me and trying to run off and endanger himself."

Gumo chuckled as she heard those words. Oh, that explained everything. The young boy that had fallen for her... Was now trying to protect his dear younger brother from somebody like her. "He hasn't been seeing any other Mamono, has he?" She asked, all while reaching towards her kiseru. Not that she had been using it for a long time...

Ikki blinked. And then he slowly slammed his face against the table yet again. "That's it. That's why he's been so hard to reach. He's been sneaking out and conversing with Mamono who want to seduce him and drain him dry. His rebellious behavior's been leading him down a path of seduction, one that he might not be able to get himself off. I need to get through to him. I need to make sure that he doesn't get drained. He's my only brother, Gumo."

"Then why don't you become the one that he has to love?" Gumo said, all while slowly inhaling a bit of smoke from the tip of her ornate kiseru. "Why don't you try and see if he's attracted to you in that way, my dear Ikki? You might've missed something quite important. Something that you had overlooked because you were trying to protect him rather than care for him."

The young man paused as he slowly lifted his head up. Blinking as he could smell the smoke in the air. "You're saying that he's gay, Kumo? Is that what you're implying?"

"Heavens, no. I don't know if he's gay, but that's not what I was trying to imply." She said, before slowly putting down the kiseru once more. It seemed like he had gotten too resistant to her smoke. Very well, she would just have to pull him into her seductive web another way. "You need to show him what kind of love you have for him. And I'm sure it's more than the kind of love that one boy has for another."

Ikki stared straight at her. And he honestly didn't understand what she was saying. How could he possibly understand what she was trying to get at? She was speaking in proverbial riddles. She was... Well, it was essentially a bunch of smoke. Wait a moment... Hold on, that smoke was... Where was he looking, exactly?

All of a sudden, his vision cleared up. And Gumo was gone. The seductive Mamono that was supposed to be sitting across from him was gone. Had he been dreaming? No, he definitely hadn't. Which meant that she was probably using one of her many techniques. What was she-

"Hold still."

Gumo's voice poured through his ear for a moment as she suddenly sank her fangs into his neck, causing him to let out... A moan? Hold on, what was happening? He wasn't supposed to moan, he was supposed to cry out in pain when he got bitten. And yet his entire body felt like it was on fire. Had she injected some sort of venom into him? He didn't understand...

As he stood there and tried his best to understand what was going on, Gumo quietly snapped her fingers to allow for her clever disguise to fade away. Revealing the arachnid lower body that identified her as a Jurou-gumo, all while she casually walked towards a shelf full of all sorts of spices and herbs that she had imported from the different regions of the world. The kind that she needed for her special blend of coffee...

"W-What's happening to me?" Ikki muttered, all while he could feel his body growing hotter and hotter. All while he felt that something was shrinking. Several parts of him were shrinking, in fact. He could feel his muscles growing less defined, he could feel his waist narrowing, but he could feel his hips growing wider and he could feel his chest growing heavier. All while his hair grew from a very casual bob cut into a long and flowing set of black locks...

"Just breathe, Ikki. You'll get used to it. Mamonofication is not easy to induce in males, but it's definitely something that's appropriate for you. The kind of relationship that needs a certain woman's touch. A touch like mine." Gumo said, all while casually planting a cup of coffee right in front of him. Though it was hard to truly call the young man a ‘him’ any longer, considering the rather generous bust that had already started to form on his chest. A bust that was even bigger than her own. How was she supposed to seduce people if he could just end up growing one like this without much effort? Good lord.

Ikki couldn't truly do anything, because of the intense heat currently rushing through him. But that didn't mean that he couldn't be manipulated into doing exactly what somebody wanted him to. And since Gumo had more than enough thread to spare, she could easily make his hand grab ahold of the coffee, and then...

The foul concoction started to pour down his throat. And all he could do was gasp and pant as it quickly reached all the way down into his stomach. It was splashing around, it was making her... H-him... H-her... God, what was he even at this point? His mind was swirling, and... and...

Ikki's eyes widened as memories flashed right by. Memories of his younger brother, Shun. Memories of the boy that had done his best to try and avoid him and try to act like he could live all on his own. Memories of how adorable he had been. Memories of how he had... Oh goodness, he finally realized...

There were many times when Shun had tried to connect with him. But because he was a man that had done his best to stay independent and try to protect him, he had blown him away. All for the sake of keeping him safe. But all that Shun wanted to do was to see him smile and be happy. And... And he had made so many cute little figurines, especially of his older brother. It was... It was..!

Tears streamed down Ikki's cheeks as he let out a powerful moan, his clothes shredding as his transformation accelerated due to his unstable emotions. It was impossible to call him male anymore, not with those massive tits currently hanging off his chest, not with that very obviously feminine arachnoid abdomen serving as her lower half, and especially not with the drooling lips that were still part of her upper half. She wanted to be bred. She wanted to be used. She wanted to breed with her brother until she was as happy as she could possibly be. And only some of that was due to the newfound instincts as a Mamono... As a Jurou-gumo. The rest?

It was the intoxication speaking. After all, spiders and other arachnids, especially Mamono like her, were turned into drunkards if they had even the slightest drink of coffee. And as soon as her body stopped feeling like it was frozen due to an excess amount of pleasure, the transformed older sibling rushed out of the door and skittered right back home.

All while Gumo chuckled. Well, this was not the way she expected to end up caring for a new brood, but to be a godmother... That was going to be an entertaining job in and of itself.

---

"Shuuuun... Shuuuuuunnnn..! Where are youuuu..!"

The moment that Ikki made it back home, her mind was only fixated on one thing. The only thing that could possibly stick in her mind while she was currently this excessively intoxicated... It was her dear younger brother. And she wanted to see him. She wanted to make sure that she wasn't just imagining anything. She wanted to make sure that he was... he...

"A-Aniki?"

There he was. The young boy that had been such a rebellious little scamp. Dear little Shun, who was currently trying to sneak out through the back of the house. All while he started to shiver and gaze at her. Because he didn't understand that his brother could turn into a Mamono. Was it really possible? He had only seen female Mamono, and it definitely seemed like he was female now. But only somebody like him would cry out towards him...

The young green-haired boy tried to back away. But there was no way that he could do that, not when Ikki's feelings were at a high like this. The thoroughly intoxicated arachnid sped towards her younger brother, dashing around him as she wove her web. Right before she disappeared from his sight, leaving behind the web that she had woven, all while... all while keeping an eye on him from a location he couldn't possibly put his eyes on.

"A-Aniki... Aniki! What are you doing!?" Shun cried out, trembling as he looked at that massive web that was in his way. He wanted to get past it, but he also didn't want to get himself into more trouble. He didn't want to risk the chance of something going horribly wrong. Not when he could go meet his dear. Not when he was this close to meeting her again.

"Just... protecting my sweet little brother... Just protecting the one that has been close to me all this time. All this time when I should've been doing things to protect you directly instead of protecting you indirectly..." Ikki's voice echoed through Shun's head, before the young boy felt a set of fangs sink right into his shoulder. Which in turn caused him to let out a powerful moan, as some sort of venom started to... wait, nothing was... sinking into him..? She just... She just bit him..?

Shun didn't understand. What was his brother doing? He looked completely out of it as he tried to look at his face over his shoulder, and it wasn't just because his brother had turned into a lady. It was because she just looked absolutely broken. "A-Aniki... W-What are you talking about..?" He didn't understand. How could he understand? He would never be able to understand something like this.

Ikki slowly wrapped her arms around her dear little brother, all while keeping her fangs inside his shoulder. Though not for long, as she retracted them and kissed away the pain. "I just... I just wanted to protect you, Shun. I didn't think about what you might be going through. I didn't think about your feelings. I just wanted to be there for you and keep you from harm. And I ended up pushing you away when you needed me. Because I wasn't ready to handle the kind of tasks that you wanted help with. Because I wasn't ready for any of it. I'm sorry. I'm so, so sorry. Please... Please forgive me..."

"Aniki..." Shun looked at her as she turned him towards her, allowing him to see those tears streaming down her face. Allowing him to take in the beautiful face of the one that he was supposed to look up to... And then his heart started to realize what a fool he had been as well. How much he had been neglecting his dear Aniki, for the sake of getting advice from somebody else...

Shun... Shun hugged his sweet Aniki and made sure that his hug was as tight as it could possibly be. Squeezing her as tightly as his little body could. "I'm sorry I didn't think about your feelings too, Aniki! I'm sorry I didn't say anything, I'm sorry!" He cried out, tears starting to stream down his cheeks as well. Ah, his emotions were overflowing too. What a fool he had been...

But as much as he loved his dear Aniki. As much as she loved him lots too... Both were at a point where it was absolutely impossible for her to hold back. And before Shun knew what happened...

He was forced to let out a moan. Because he felt something squeezing down on his shaft. And that happened to be his dear Aniki. Her sweet folds were trying to wring something out of him. Even though these folds were inexperienced, even though this was the first time they had ever milked anything...

They were vigorous. Ikki was making sure that she got as much food out of her dear Shun as possible. Not just because she was in love with the little boy, but because she was hungry. All of that coffee had served to make her extremely and excessively hungry. Especially thanks to the lingering effects of the intoxication...

But of course she couldn't drain him. She needed to make sure that he was getting the kind of food that he needed to put out the kind of food that she needed. Which was why she pushed him up against her bosom. She forced him to suckle on her treat... A teat that was actually lactating too. She didn't understand how she had begun to lactate, nor did she truly care. She was just happy that she could make sure that he was well fed...

Shun swallowed as much milk as he possibly could. All while he thrust the best he could, to try and satisfy the kind of need that his dear Aniki had. He barely understood what a Mamono needed, because the Mamono that he had been meeting with only told him so much. She didn't want to teach him what it meant to fuck somebody quite yet, that wasn't her area of expertise. She was just a merchant that looked out for boys like him.

But Aniki was quickly teaching him exactly what he had to do. He just had to thrust in, and he had to suckle, and he had to breed her, and he had to make her happy. Because then she would be happy, and he would be paying her back for everything that she had ever done for him. And... And..!

Both siblings cried out in tandem as they orgasmed in unison. Crying out as they both collapsed onto the web-covered floor, both having been overwhelmed by the sheer exhaustion that followed an orgasm as strong as this one. An orgasm that would keep them floored until the sun started to rise.

While their relationship had now been repaired, and the two knew their love for one another... It would be an awkward few days after that, as they both had to process the complicated emotions that came with fucking one's sibling, and the fact that one of them had been male just a few hours prior.

But after that... The web of their love would continue to be woven, until it grew to the point where it could support the family that was to come...