[So in the story Rin has known all his life that he has demon powers and has known that Yukio was an exorcist.Also Rin didn't unsheathe his sword so no powers yet.And the story takes place two months after Shiro has died and it is after the exwire exam so Amimon isn't in the story yet]
So in this story things are very different,If you find someone that you love of the people that you love,If your bond is strong enough then you are able to fuse with that person.(Like from steven Universe) And Rin has been dealing with a lot lately with Shiro dying,and just two months ago leaving a toxic relationship with one Reiji Shiratori that he was with for a year.And Now the exwires have to take a fusion class.So get ready for angst,Dancing,Ballroom dancing,Singing,Art,Fluff,Depression,Violin,And sibling love
Guys gals and non-Binary pals I give you
"Fusion Is Like Fire"
Rin doesn't care. He hasn't been able to since he was six. He knew he was emotionally detached from the start, even before Shiro had taken him to a psychologist to be officially diagnosed with severe Emotional Detachment due to trauma. He also never thought he'd have friends, but here he was, killing demons side-by-side with the only people on the planet that cared about Rin Okumura.
"Huh. I guess even someone like me can have friends. That's unexpected."