Brothers Fiend [Rin x Reader]

Protective

What are you supposed to do when the guy you're crushing on is a demon? And not just any demon, in fact, the son of Satan himself. Unbeknown to me, I was the only one in class that hadn't known this. You can imagine my complete shock when I discovered Rin's secret. Although, it did make more sense of Yukio and I's conversation from last night.

"Beautiful..." I whispered as I seen the blue flames dance around Rin's body. I had seen those flames before. On the blue night; when all my family were killed by Satan. To anyone else, it probably wouldn't have immersed the fondest of memories but to me, it just highlighted every aspect of Rin I had gotten to know in the first place. His courageousness, his bravery, his confidence. Beauty.

He really was a spectacular being.

"My flames only appear when I take out my sword," he told me, noticing I hadn't actually said anything yet.

"This is just...just amazing, Rin. Why didn't you tell me?" I asked, somewhat upset but mostly in awe. I had never seen such a look of relief on someone's face before.

"Well," he began, retracting his sword and putting it upon his back where it usually rested, evaporating his flames, "I really didn't want you to hate me for this. I'm so glad you don't. Everyone else in the cram school knows. Bon told me a couple of months ago about the 'Blue Night' and I knew you were there. I didn't want to trigger unwanted memories but you had to know, (Y/N), I couldn't lie to you any longer. I guess I don't got it in me," he said.

"Oh, Rin," I chuckled lightly and pulled him in to an extremely tight hug. He hesitated at first but eventually became comfortable.

"I'm so happy I told you."

"Me too."

xxx

After Rin revealed his secret to me, we became closer than ever. I hadn't talked to Bon since the day we came back from camp which had been well over a week ago. Class became kind of awkward seeing as he sat in front of me. I persevered even so.

Yukio was absentmindedly drawing notes on the board for the class to copy down for our final exam. Shima was scribbling down beside me just like I was but of course Bon had to be tapping his pencil.

"Could you stop that?" I tried to say as kindly as I could.

After a couple of moments, Bon replied without turning around, "I've had a long and hard think about the answer to that. It's never."

"Arrogant prick," I whispered under my breath, ambiguously wishing he had but also hadn't heard me.

"What did you just call me?" he boomed rather loudly, turning around and gaining the attention of the class. Oh well, no going back now.

"An arrogant prick. Arrogant and then a prick. Would you find it easier if I were to spell it out for you?"

"You better watch your mouth!" Bon said, standing up with his hands upon my desk.

"Or what?!" I eventually caved and shouted back, mirroring his stance.

"Or I'll...I'll..."

"Hm? What's that? Oh, yeah. Nothing. What I thought," I said.

"That's quite enough," Yukio finally spoke out, "Detention for both of you."

"Your fault," I whispered as Bon and I took our seats.

xxx

Detention could have been worse. All it consisted of was moving some desks and clearing some boxes in the class adjacent from the exorcism class. The only thing that was bad about it was the very awkward tension that rested in the air. I wasn't going to be the one who had do apologise. After all, he began this argument when he said I was all over Rin and decided on embarrassing me in front of everyone.

We were nearly finished when Bon decided to take a bathroom break and landed me with the task of getting a box down from a high shelf. Damn that bastard for leaving me at such a crucial point of the operation. Him being his usual six foot self should have made it his job in the first place.

I decided that if I wanted to get stuff done, I'd have to do it myself. In genuine terms, yes, but also metaphorically. That sentiment all went out the window when I nearly killed myself trying to jump up and catch the box in my arms.

"Need some help?" asked a voice which I knew all to well.

I hesitated a bit before reluctantly agreeing.

"Thanks," I said when Bon roughly shoved the box in my arms.

"Whatever."

The atmosphere felt as though it was on its last thread before Bon finally spoke up.

"(Y/N), I'm so-,"

"I'm sorry too!" I cried, running into his arms, him stepping back a bit from the impact but nonetheless, embracing me too.

"I never want to argue with you again," I said on the verge of tears, "You'll always be my best brother and nothing can change that."

He softly patted my head, "And you'll always be my little sister that I'll help whenever she needs it. I'm sorry about saying you were hanging all over Rin. I just got upset because I don't want him to hurt you, ever," he said, being his serious self.

I pulled back from the embrace to look him in the eyes, "Bon, you know I love you and I'd never do anything to spite you. I do like Rin a lot and it really hurt when you said that. I don't think he'd ever intentionally hurt me and it sucks that you guys were good friends before I got here. Please go back to that," I pleaded with him.

"Sure. I'll do it for you, sis. But just know, if he hurts you, I'll kick his ass!"