Requested by: @Kisechan30 and before you kill me for not doing the love triangle first. Hear me out in the A/N at the end.
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Today the Armed Detective Agency actually seemed peaceful for once. No hard cases, the actions of the Port Mafia were being dealt with accordingly. It was quite peaceful, and organized quite a perfect atmosphere for a certain member. Kunikida typed up his reports finding peace in the still quiet, and also not being bothered by the idiot Dazai. He sighed contently, and then the front doors burst open making him jump up in his seat in shock.

"Hey! Kunikida-kun! Just who just came back to Japan!" It was Dazai yelling, and he had another person with him.

"Dop-po-chaaan!" He heard a very familiar voice call him. He turned seeing a (s/c), (h/c), figure. It was none other than his boy/girlfriend (L/n) (Y/n). On the outside he sighed annoyed, but a secret part of him was glad to see you no matter how much you annoyed him with your hyperactive attitude. He just never showed it since he was stubborn like that. You immediately raced in and hugged him tightly once you saw him.

"I'm baaacck!" You exclaimed smiling widely.

"I can see that." He said monotonously, but you can feel him wrap his arms around you.

"Did'ja miss me?!" You asked snuggling him. He choked on air and blushed heavily, but he cleared his throat to gain his composure.

"I did...a bit." He mumbled. You overheard and grinned playfully.

"Aww was Doppo-chan lonely without me?" You asked poking his cheek. He popped a vein slapping his your hand from his cheek. You didn't mind, it was just a fun rountine for you two, well at least you thought so. Dazai came up as well poking the other side of his cheek.

"I'm sure he missed you (Y/n)! He's just really stubborn~" Dazai teased. You giggled and poked Kunikida's cheek again.

"Aww how cute!" You cooed grinning. Kunikida had veins all over his forehead as his annoyance peaked.

"Will you two stop that?!" He yelled. Both you and Dazai gave a goofy smile at him making him sigh. You and Dazai high fived, your personality was so much like his. Well at least the lighthearted, goofy part of his personality. It was like you were a Dazai clone, and it was such a mystery to Kunikida how he could have fallen for you.

"Fine~" Both you and Dazai said giving a pouty face to him. He sweatdropped and sighed heavily. He grabbed your hand leaving Dazai there confused, but he got over it and went to find Atsushi.
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Kunikida finally dragged you to a vacant room, and you immediately raced in and started jumping on the sofa.

"Sooo Doppo-chan, now that we're alone, you can stop acting like a little Tsundere~" Kunikida choked on air and glared at you.

"I-I'm not a tsundere!" He yelled.

"Sure sure." You sat on the couch stretching.
"So what'd I miss when I was gone?" You asked interested. You always loved when he told you of the different cases the Armed Detective Agency took. Of course it was really rare for Kunikida to tell you cause he liked to keep them confidential. But that didn't stop you from going to Dazai who basically spilled everything about the Detective Agency to you.

"T-That's highly classified." He stuttered not looking at you in the eyes. You blinked staring at him for a moment before grinning slyly.

"Awww, you're not gonna tell me?~" You said playfully. You stalked up to him and he backed away. It was a game of predator and prey and it was clear who was what. Kunikida backed into a desk where you pinned him, a playful glint in your eyes. You leaned onto his chest tracing your finger up and down, Kunkida gulped loudly blushing like mad.

"You know you haven't told me a lot of things lately. What are you hiding Doppo-chan?~" You asked still teasing him.

"(Y-Y/n), s-stop that." He stuttered his composure falling. He blushed even harder when you leaned in on his neck. He could feel your breath which made his voice hitch.

"(Y/n), I'm serious." Kunikida said.

"I'm also serious." You said making him do a double take. You were never serious, either you were toying with him or something possessed you.

"You haven't been telling me what's been going on since I left. And even now you've been quiet. Is it that you don't trust me?" You asked, you kept your face hidden in the crook of his neck. He pushed you off to look into your eyes.

"Absolutely not that! It's just...the Agency has been caught up in some serious business. It's dangerous, and I didn't want you involved because you might get hurt. Just the thought worries me a lot really."

You grinned your playful grin at him, and your heart was beating very face.
"Aww!" You hugged him making him grunt and shift a bit.

"You're worried about me! That's the first time you admitted it!" You said snuggling him. His face was beet red by the way you were squishing him.

"But you don't have to worry! I won't put myself in danger...most of the time. I just want to be there for you." You said. He gave a tiny smile at your concern, one of the rare moments where he did.

"So pleeeaassse tell me what's been going on! Please please pleeeaassse!" You squished him hard while begging. He sighed and rolled his eyes as your hyper nature returned.

"All right! Just calm down and sit on the couch." He ordered getting annoyed at your begging.

"Yay!" You cheered. You left from the hug and jumped on the soft material patting the space next to you as you awaited him. He sighed to himself thinking of how to start his explanation.

"Ok so where do I begin...?"
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"Huh, so the Agency wants to make an alliance with the Mafia?" You asked confused.
"But aren't you guys enemies?"

"It's complicated, you don't need to indulge yourself more than this." Kunikida said.

"Hmm...Dazai-chan never told me about the alliance thing. He only told up until he said he was once a member himself." You said going into thought.

"He said what to you?" Kunikida looked at you in disbelief. He remembered himself when Dazai told him he was once a part of the Mafia, let's just say the news was enough to make him faint.

'How did they know that before me?!' He thought.

"I'll go ask him! Dazai-chaaaan!" You called running out of the room.

"W-Wait (Y/n)! Don't call that idiot!" Kunikida got up to run after you.
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You were fast, and you out sped Kunikida by a long shot. You found Dazai loitering in the office and shot up to him.

"Dazai-chan! Dazai-chan!" You called jumping up and down.

"Ah, (Y/n)!" Dazai pet your head with a smile.
"I thought you were with Kunikida-kun?"

"I was, but then he told me something interesting." You went up to his ear to whisper what Kunikida told you.

"Ah, that's right! We were planning on doing that. You see..." Dazai whispered back in your ear. Just as he leaned back Kunkida smacked him in the head hard with his notebook.

"Don't tell her every one of our plans bastard! Don't get them involved!" He yelled.

"But Kunkida-kun, they're your boy/girlfriend aren't they? (Y/n) he's being mean." Dazai whined to you holding his sore spot. You pouted at him as well folding your arms.

"That's right! I just want to hear for support I told you already! Don't be mean to Dazai-chan."

Kunikida flinched with the look you were giving him. But at the same time he couldn't help but feel this annoyed feeling building up inside him. Especially when you and Dazai ganged up on him.

"F-Fine..." He trailed off making you smile. You went up and hugged him, and no matter how hard he tried his red blush remained visible.

"Ooooh! Kunikida-kun is blushing!" Dazai called bringing attention. Kunkida growled glaring at Dazai with a dangerous aura. You just laughed and continued snuggling him.

"D-Dazai-san if you tease Kunkida-san any further he might, no will kill you." Atsushi commented sweat dropping.

"He's just quite the tsun tsun~"

"GO DIE IDIOT DETECTIVE!" Kunkida screamed in embarrassment. You just laughed harder. The habitual feeling of teasing your boyfriend returning.

"He sure is, but I love him for it~"

A/N: This is more romantic comedy fluffy. Ok as for the love triangle, I'm gonna be honest I'm trying to come up with a good plot for it. I want it to be worthwhile since it's the one most people are looking forward to. I take my writing seriously and I don't want anything to sound forced. I thought it would take place where Dazai and Akutagawa were both back in the Mafia, but I need it to make sense. I need to get a feel of their "relationship" before I add reader-chan in. So it might take a while. Or less than a while if I actually get something.

Next up:

Ranpo X Gentle!Reader

Ranpo X Reader (LEMON); this one's a little gift for marcchi_

Chuuya X Scared!Reader