Based on the anime before the 'after one year' thing but with slight modifications after the battle with Toue Konzern:

1) Sei did get admitted in the hospital and is in a comatose state after Aoba 'destroyed' him.

2) Ren did not awake in Sei's body like in the anime in the end but in the Allmate, that is, he remained as he is, but acquired the ability of transforming into his human form from time to time but only temporarily.

This story of mine will start from Noiz's POV (I seriously like this guy)

Enjoy…

Noiz, clad in only a simple robe, sat on his hospital bed as he stared at the bandages around his hands up to his shoulders. He also had his head bandaged up as well as his chest all the way down to his waist. The youngster honestly felt like a mummy and the injuries beneath also felt somewhat itchy.

Previously, the ever present bandages around his hands had never bothered him. He had only found them necessary to cover up the scars on his hands so as not to raise questions or getting awkward staring of people.

Pain was a sensation that he had never even felt before. It was the first time that Noiz was feeling this much of physical pain and strain after a fight. The gentle Aoba had taught him it was natural to feel pain and only the latter can prove that one is alive.

Noiz flexed his hands and arms a little and winced in the process but a smile had ghost over his features while he did so. He was bewildered by the pain and at the same time in agony, yet he found this new sensation very enjoyable.

It feels good.

Noiz remembered the worried looking Aoba as he rushed his friend, Koujaku and himself to the hospital after the destruction of the Platinum Jail's Oval Tower to have their injuries checked out.

Koujaku only suffered from minor injuries and mostly of fatigue as he had pushed his body past its limit whereas he had not been so lucky and had to stay for a few days in the hospital.

At first he was overcome with the thought of being alone again in the hospital and refused to be admitted saying that he'd rather stay in his apartment than being enclosed in a foreign and lonely room but Aoba would not allow it and reassured him that he would come to visit him every day as he wanted that the boy receive all the medical attention needed for him to recover properly.

Noiz looked up at the clock on the wall across the room and found that it was almost time for Aoba to come to visit him.

He sat himself more comfortably on the bed and leaned back on the pillows piled up behind his back. He smoothed down his messy hair and after that, dragged up the blanket higher up his waist. Noiz took a deep breath and glanced around to check if anything was amiss before the arrival of the blue haired.

Indeed, a few seconds after his preparations to receive his guest, the door of his room slid open gently. A head poked into the room first and Noiz's eyes met with the blue head's.

"Hey, how are you feeling Noiz?"

Noiz only made the motion of raising and lowering his shoulders once in reply.

"Aoba?" he asked as he came near his bed, put down his shoulder bag and zip it open to release his Allmate, Ren. The latter jumped onto the bed and made itself comfortable after greeting the patient with a simple, "Noiz."

"Hmm? What is it, Noiz?"

His eyes looked up for a moment and then lowered his head. "Pat me on the head," he said simply.

Aoba chuckled and complied, giving him a pat and stroke his hair gently. Calmness settled on Noiz's spirit and he practically swooned with happiness as a faint smile crept onto his face.