[Doll TF, Humiliation, Diapers]

"You came back, Onii-chan. Surprising. I thought you'd stay away, safe with your Servant by your side."

Shirou could feel the sweat pouring down his back as he gazed towards the short Master. Illya von Einzbern. She used such an affectionate tone when she talked to him. It made him lower his guard, even though he knew that she was dangerous. Which was why he was here. Tohsaka had talked him into bargaining with her, to give them time to reforge the contract and give Saber a better Master.

All he had to do was appeal to her. And hope that she would listen. "I don't want to fight you, Illya." He said, as he took a single step forward. Despite knowing that she no doubt had Berserker standing guard nearby...

Illya giggled as she gazed upon the older boy. All while her smile grew wider. "If you do not want to fight me, then you have to serve me, Onii-chan. If you do, I won't hurt you." She said, as she offered her hand. "Come closer, Onii-chan. I'll keep my promise."

He knew better than to trust her. And yet he did. Because there was no other true option. He was going to listen to her and do what she said. All so those two had more time...

And yet as he took a single step further forward, it was like his body suddenly lost... control...

Not a moment later, and Shirou Emiya's body grew cold and lifeless as it fell to the ground. All because of the subtle golden glow that left his body. A glow that ended up in the palm of Illya's hand, the young girl smiling brightly as she carefully caressed it.

"Oh, Onii-chan. Truly naive. And here I thought Kiritsugu had taught you something..." Illya whispered, as she made sure not to hurt the glow in her hand. She didn't want to hurt him. She had promised that much. However, she didn't promise him anything else. Which was why she was admonishing him, since she was sure that the other girl had done her best to try and teach him about the trickery that some magi were willing to pull.

No matter. He'd be hers. Just as he always should've been...

---

Shirou's eyes... Opened? Or rather, he regained consciousness to the point of regaining his sight. And the first thing he did was try to struggle, because he was seemingly being held. He didn't want to be held. And he wanted to scream, to try and figure out who was responsible.

But his body didn't move in response to his commands. Nor did his voice. All he really did was toss his eyes around to try and see what was happening. And yet even that was practically impossible. Because it didn't seem like he could make heads or tails of where he was.

He could see a beautiful ornate room. And that was about it. He seemed to be lying down in a bed? A really soft bed that was making it hard to keep his eyes open. Though he also couldn't close his eyes. It was like he was a doll. Or at least something equally inanimate...

It was then that he tried to gaze down towards himself. And he was quick to notice his current form. He wasn't... He wasn't human, nor was he animate. No, he was... He was stuck in an incredibly humiliating form. One that he never imagined he would find himself in...

He was... Well, he was in a baby doll. There was no better way to explain it. He was in a rubbery baby doll that could only vaguely move his arms. And even then, he wasn't the one that was able to move them. Not only that, but he was completely naked. Laying down in bed, completely stuck and unable to do anything...

It made him want to cry. It made him want to sob. And he knew that those weren't normal reactions. It was this doll trying to make his soul fit it. So he stayed strong. As strong as he could, while practically unable to move a single inch.

"You're adorable, Onii-chan. Don't you think so?"

Just like that, his worst nightmare arrived to make things worse. All while carrying that wonderful smile on her face. Illya... She had been behind this. It wasn't hard to imagine that she had been the culprit, at any rate. But the more pressing question was just as obvious.

Shirou tried to say 'How did you do this?' and 'Why did you put me in a doll?' But neither of those statements made it out. All he could do was stare straight at her. And hope that she could understand what he was trying to say.

"You're probably wondering." Illya chimed, as she patted the adorable doll on his incredibly tiny head. "How I put you into that doll? The Einzbern family knows much about transferring souls between bodies. Why? Of course I want to keep my precious Onii-chan all to myself. Why would you even ask such a silly question?"

She was a terrible child. A terrible girl in every understanding of the word. And yet he couldn't do anything to fight back against her. Especially not as she plucked him from the bed and held him in her arms.

Compared to when he was lying down in the bed and the bed nearly wrapped around him from how soft it was, the way she held him was a lot more... caring. Which just made the situation he was being forced into that much more awkward. He wasn't supposed to be enjoying it in any measure. Which made him tremble so much more. He did whatever he could to try and get free, but it was all pointless. He couldn't force himself free. Not when she kept holding him like this. Not while he was trapped in this tiny doll that allowed him no freedom.

His shame and his humiliation only rose as he was carried over to a table, where a certain white garment was waiting for him. A tiny diaper. All he could do was stare up at Illya. He wasn't going to wear that... Was he? She wasn't so cruel as to make him wear such a garment, was she..?

Given the glint in her eye, it was clear that he was going to. No matter how much he wanted to avoid humiliation, she wanted to force it upon him. She wanted him to live with it. Because it's what she wanted for him. And whatever she wanted would become real. As long as she got her way...

The diaper was easy to put on. Because it went right under his butt, then in between his very stiff legs. And then the tapes were attached, making sure that it was firmly grasping his hips. Ensuring that he wouldn't suddenly drop them and be forced to expose what little even was between his thighs.

"There. Now you're even cuter, Onii-chan." Illya chimed, as she gently kissed him on the cheek. "Maybe if you're a good baby boy, I'll let you talk. Do you think you can do that, Onii-chan?"

He couldn't really nod to agree with her. Even if he didn't want to agree with her. Even if he didn't want to give her this victory. But he had to submit and agree. Because otherwise, she'd do much worse to him. So he just gazed into her eyes and let that serve as his answer. Even if it really wasn't much.

But it seemed as if she did understand. Smiling from ear to ear, as she patted him on the head and held him tight. "Good boy." She whispered into his ear, as she started carrying him away. Out of this room that he felt so trapped in...

It felt nice to be praised by her. And he knew he shouldn't get used to the feeling. If he did, then she'd find a way to abuse it. But it also managed to dull his senses for just a brief few moments, making it hard to read the other sensation that poured through him...

The sensation that let him know that Rin and Saber were here. It was faint, because his abilities as a Magus were dampened while he was inside this doll. But he could feel them. And it was why he then gazed into Illya's eyes. As if he wanted to know what was happening to them.

"My my. You can feel them, Onii-chan? Indeed, we have a couple of uninvited guests." She said, as she slowly walked out of the hallway that she had been walking down. All so they could enter the foyer of the Einzbern manor...

And see Berserker towering over a defeated Saber and Rin. The Servant had not killed them, merely knocked them out. A mercy, though one that served to fill Shirou's heart with dread.

He had done all of this to buy them time. And they still lost. Not only that, but it was clear that Berserker hadn't really taken any damage. No way. No... No way...

"Berserker did a good job. I was slightly worried, thinking that he might be in danger without me. But he really is the strongest in the world." Illya giggled, as she held up the baby doll as she let him watch the scene more closely. "How does it feel, Onii-chan? Those girls were your friends, weren't they?"

Indeed they were. His friends and allies. And they were... They weren't dead, but they were definitely in need of assistance. Assistance that he couldn't give them. The sight of them... The sight of his failure to rescue them and keep them safe...

It made Shirou cry. The doll body that he was stuck within finally responded to his emotions. And he started sobbing uncontrollably. Crying and wailing, almost like a little baby would. Which just made his caretaker giggle in turn...

"You're giving into your new body, Onii-chan. But I understand. It must really hurt to see them like this." Illya said, as she carefully caressed the baby doll's chest. Only to giggle a little more as she noticed something between Shirou's legs. "My my. You're bonding even more than I expected you to at this point..."

Shirou would sniffle if he could. But the tears just kept on pouring. Even more so as he felt a hand brush up against his diaper. She was checking him... And he was wet. He had wet himself at the sight of his allies having been defeated. Filled his diaper with pee, thanks to his own uselessness.

This prompted Illya to hug him and carefully caress his cute little head, as she pressed him up against her flat bosom. Though there was no milk, she still radiated a certain sense of warmth and maternity. "There there, Onii-chan. They can join you. You three will be my adorable little babies. And once this war comes to an end... I'll make sure that you all live a happy life with me. Doesn't that sound great?"

It sounded horrid. But he couldn't express himself. Not with his wet diaper. Not with his sobbing tears. Not with his body being barely under his control. All that Shirou could do was look at Illya, especially as she pulled him back. Especially as she conjured up a bottle full of warm milk...

She couldn't breastfeed him. But this would suffice. Especially as she put that rubber nipple into his mouth, and the milk slowly but surely started to pour into his tiny little tummy. The warm feeling of the wonderful liquid pouring down his throat calmed him. Even if he didn't want it to. All because he had been giving into this doll.

Slowly but surely, Shirou's eyes started to close. And the thought of Rin and Saber joining him as Illya's baby dolls... It filled him with dread. But the milk tired him out. And all he could do now was close his eyes and give into his exhaustion...

Knowing that Mommy Illya would take care of him, and humiliate him for the rest of his life...