FATE/Probability

In the room filled with simmering glow from the sigils of the active bounded field, slept a red-haired boy. The boy slept with comfort for a period until his expression started changing and his body sweating, his face contorted in pain then was filled with a strange kind of appreciation.

The boy`s arms wrapped in white cloth suddenly began releasing blue light. The circuitry on the bandages was lit as the magic circles on them glowed in a rhythm. Fine blade tips began growing from the boy`s arms.

The fabric of the bandages acted as if they had come alive as the threads parted to allow the growth of the blades. The blades varied from curved katana tips to bent talwar tips and triangular jian heads.

The magecraft inscribed on the mystic code began functioning by siphoning mana from the bounded field. The thread warped around the skin and the hemostatic magecraft stopped the bleeding to prevent blood loss from becoming fatal in sleep.

The whole night passed like this even after shirou was calmly asleep again.

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…

The next morning a girl stood at the gate of a supposed ghost mansion, she was wearing form-fitting sportswear and carried a backpack on her shoulders. Rin waited for shirou from the early morning, she went inside after getting annoyed at his delay and had her breakfast.

When it was 9 am and the boy didn't come rin started getting worried. she thought

Remembering her father`s lessons she struggled with herself as one side of her desired to go to emiya residence and meet shirou and the other side said to follow the magus logic and not meet another magus without reason and take unnecessary risks. Finally, she thought. 

Finding a reason for herself she hurried to get ready as she felt anxious, the incident during the 4th holy grail war was still fresh in her mind and she feared having shirou in the position of her classmate.

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…

Rin stood in front of emiya mansion and after contemplation forced her way inside the bounded field. The feedback from the bounded field instantly woke up the sleeping shirou. Waking up shirou looked around as pain hit him.

Felling the searing pain in his arms he let out a grunt as he scrambled to stand up. Standing he 1st rushed to the drawer keeping the guns, loaded his gun and held his mystic code in his left hand. Holding a gun and sword in a cross position, he slowly crept towards the doorway while flooding mana into his body.

As he crept closer to the door he smelt the familiar scent of gems and medicines as well as strong perfume. Receiving this scent he calmed down a lot and shouted.

"Is it you tohsaka?"

After receiving an affirmative response from beyond the door and again confirming the voice he opened the door. Opening the door he found Rin dressed in the garments she used during the matches and it triggered his memory of their bet as well as the scheduled spar.

As he was about to apologise to her she rushed into the door and closed it behind her. As shirou was looking at Rin so was she, taking in the condition of the boy. Without question, she saw the sword tips sprouting from his arms and the bloodstains around them on the mystic code he was wearing.

Taking in a deep breath to calm the panic rampaging inside her she tried to ask calmly but her eyes betrayed the worry she tried to hide.

"Shirou what happened to you? Why are you in such a condition?"

Looking at the girl`s expression shirou understood that avoiding the truth was not an option and he also didn't want to hide things from his only friend with whom he could share it all. He decided to tell her a half-truth and hide the things about his future visions. He made her sit in the living room and gave her some snacks as he went to brush his teeth and get fresh.

After coming back he was forced to sit down by an evidently anxious rin and narrated the cause and effects of the events causing these injuries. After hearing the reason Rin sat in silence for a while before saying 

"Let me get to this straight, your origin and element are the same sword. Your family time magecraft makes you face near death in your dreams which stimulates your origin, which makes you sprout swords from your body as a form of self-defence and this can easily be fatal"

Rin felt her blood pressure rising from the sheer absurdity of this, finally calming down she said

"So now we have to find a way to remove swords from your skin, then stop the bleeding and heal the wound."

As she talked she felt a pang of regret for not learning healing magecraft, as she could heal shirou easily with her od if she had learnt it. Determining to practise healing magecraft after this is over rin and shirou planned what to do. The human porcupine-looking boy said 

"Tohsaka can you use suggestion magecraft properly?"

"I can do it if it's a normal human without magic circuits or any other form of resistance," she replied.

"Then let's go to the hospital." said shirou.

Then they discussed the direction to go with the idea. Rin suggested that shirou keep wearing the hemostatic mystic codes and then cover his hands by wrapping clothes. They made a fake splint on the boy`s arm and then left emiya residence.

They walked through the road and blended into the crowd as taught by kiritsugu and moved towards the hospital as inconspicuously as possible. They reached the city`s general hospital where shirou was kept after the fuyuki fire incident. 

They went to the reception desk and shirou stood beside Rin, covering her face from the general view. The receptionist smiled as she looked at the two children and asked. 

"Are you two lost?"

When the woman`s eye met the glowing eyes of the budding magus she went into a trance. Rin said 

"Call us when the lobby becomes relatively empty."

As the two children went to a bench to sit the receptionist stood bent over for some time till she came out of the trance, presenting a very odd view for any viewer. After 45 minutes the lobby became relatively empty the receptionist called them.

After putting her in a trance again they took a receipt from the desk and went towards a secluded corner of the hospital, this part was scheduled to be renovated and was to be closed in 3 days.

They met the doctor who was surprised to see two children without any adults with them. Petting him under a suggestion they made him ready to perform surgery on shirou by making him think it was just a normal splint removal.

By the time the operation of shirou began, rin was already sweating from using suggestions on multiple nurses and other staff. Shirou didn't take any anesthesia to maintain his consciousness for a quick escape.

The pain from the operation was surprisingly bearable for the boy, it was not like he didn't feel the pain but that pain didn't obstruct his mind as it should. Using structural grasp on his own body he perceived the operation proceed in real-time and even felt the thread used to stitch the numerous wounds across his arms.

Finally, the pair left the hospital with Rin having wasted more than half of her od for their undetected escape. Shirou covered his arms with his shirt sleeve and held a box containing the blade tips extracted from him as he walked home.

After reaching the emiya residence shirou went into the kitchen to prepare snacks for Rin as well as their lunch. Having had a bland nutritional supplement that kiritsugu brought from the millers saying that it would be helpful in his survival training.

After making the food the two called kiritsugu who didn't pick up the phone after a long ring. Hence following his father`s instruction shirou rang the number 3 more times with 2 consecutive long rings followed by a short one.

Still not getting any response the two of them began talking about mundane matters and the topic slowly delved into the basics of magecraft, With Rin lecturing a shirou who kept failing to apply a basic shield to his body or even shield his senses.