Requested by WaffleCake00 enjoy!
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You stepped out of the white hospital building breathing in the fresh air of spring. You sighed out of breath of happiness, now that you're out of the hospital you were now free to roam as you pleased. Now the question...why were you in the hospital? The answer is simple, you suffer from a condition called Paroxsymal Supraventricular Tachycardia or PSVT for short; it was where you had an irregular, fast heartbeat. You hated it, you had just discovered this condition a month ago. Your chest felt so tight like it would explode any second, and you barely felt any oxygen come into your body. It was during a case for the Armed Detective Agnecy that this happened, and the one to save you from it, Doppo Kunikida, you still remember the incident.
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~flashbacks~
"Kunikida-san I've got a bearing on the criminals location." You said to your partner for this case, Doppo Kunikida. You and Kunikida were sent out to catch a couple of criminals who had bombed a famous business building in the heart of Yokohama.

"Great job (L/n)-kun." He praised. Your cheeks turned slightly pink at his praise, you were still not used to compliments.

"Where are they moving?" He asked.

"Umm.." You checked your portable laptop, displaying a GPS tracking system.

"They're moving in our direction!" You exclaimed.

"Then we shall ready ourselves then!" Kunikida declared. He got out his favorite notebook preparing his supernatural ability. He scribbled down words as quickly as possible.

"Doppo Poetry! Notebook change into a pistol!" The page shined as it morphed into a silver pistol. You got your own gun out too as you prepared yourself.

"According to this they'll be here in 3...2...1!" You declared. Two gruff looking men came running from down the hall. You two pointed your weapons as them and they froze in their spots.

"You two, not another step!" Kunikida exclaimed.

The two men looked panic, but decided to put on a tough guy façade.
"Well if it isn't two pawns from the Armed Detective Agency." One guy with spiky black hair dressed in a ripped jacket and blue jeans said.

"Oh yeah that guy from the Mafia told us about you." The other brown haired man said.

"You have affiliation with the Mafia?!" Kunikida asked in shock.

"No, we were just paid a heap to place bombs around in this place by some scientist guy." The black haired guy said.

"You two..stay right where you are. We're taking you in!" You declared bravely.

"Well aren't you brave? Don't get your hopes up babe. We're definitely running now that we did what he asked. So move aside!" The brown haired guy spat. Kunikida tightened the hold on his gun as the word spilling out of the thugs mouth came out as insults directed towards you. As he continued his nonsensical insults the other thug pulled out a gun aimed towards you. He didn't hesitate to pull the trigger. Kunikida panicked as he saw the bullet go straight to you, our of instinct he went to get you out of the way. You on the other hand had the felt the adrenaline pump in your veins. But it felt...different.

Kunikida gave a deadly glare at the two thugs who tried to make a get away. He got the silver pistol aiming for the bottom of their feet, he pulled the trigger making them stop in their tracks.

"Like we said, you're not going anywhere." He said.

"Bastard.." The black haired thug hissed.

"Well then we'll just have to fight!" The other thug declared as he went towards you in an attempt to punch you. You remembered the training Kunikida offered you when you first joined the Agency. Your self-defense kicked in as you grabbed the man's wrist and judo flipped him.

"Nice try." You said giving a smug smile. Your heartbeat out of adrenaline and didn't feel like stopping anytime soon.

Kunikida shot his pistol intercepting the bullets of the other thug. Just as the thug ran out of bullets, Kunikida made his move as he punched the guy in the jaw and then judo flipped him.

"Nice job Kunikida-san! That was awesome!" You exclaimed grinning. His cheeks turned pink as he heard the words come from you. He cleared his throat to compose himself.

"Yes, well...we should wait for the others to come here to take them in." He said looking at the two unconscious thugs.

"But who would've thought the Mafia would get involved." You said, you rubbed your chest as you felt a slight pinching feeling.

"They have gotten more active lately." Kunikida commented.

"A-Also Kunikida-san," You stuttered as you blushed slightly.
"Thanks for saving me." You said smiling slightly.

His cheeks got even more deep in color as your smile made his heart race.
"Of course, I would always be there to save you." He said, his deep voice giving off a sincere feeling.

You blushed deeply at his declaration as your heart beat wildly. But suddenly you felt your heartbeat too quickly, even if the man you have fallen in love with was standing there smiling at you. The pinching feeling turned more severe as you felt like your chest was being compressed by a heavy weight. You eyes widened and you gave heavy pants, you clutched your chest as the racing heartbeat and compression felt unbearable. Kunikida's eyes widened as well as he saw your body and face scrunch in pain. You collapsed on the floor with a loud groan as you heard nothing put your pounding heart.

"(L/n)-kun?!" Kunikida rushed to you as he elf your torso in his arms.

"What's wrong?!" He asked panicking. You didn't hear him as the squeezing of your chest occupied your being.

"It...hurts.." You gasped as the pain finally managed to knock you out.

"(L/n)-kun!" You faintly heard Kunikida call until darkness consumed you.
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You had remained in the hospital for a week, getting constant check ups from the doctors as well as a diagnosis for your condition. The doctor said it wasn't fatal, but it would affect you if you went on without medicine. So you got prescribed some drugs that would apparently help you, and left the hospital with that.

"It sure felt fatal." You mumbled as you walked the city streets.

The hospital felt really boring to you. You never left your bed, and the constant sight of white walls and nurses got boring very quickly. The only thing you looked forward to were the visits from your colleagues at the Agency, especially Kunikida. You blushed slightly as you remembered he stubbornly stayed by your side for an entire night, while also acting like an adorable tsundere the entire time.

You giggled at the memory. But now your were even happier as you finally get to see him again without waiting and without restrictions. You took out a small journal from your bag as you skimmed the pages, they were your entire thoughts written on paper. A majority of them concerning your feelings for Kunikida. You had developed the habit of recording everything you did from him, as he had an addiction to his little notebook. You saw the doors to the Agency just a few feet away, a feeling of excitement bubbled up within you as you jogged towards the door slamming it open.

"I'm back!" You exclaimed happily. Everyone stopped what they were doing as they looked at you with looks of relief, and happiness.

"Welcome back (L/n)-san!" Dazai Osamu greeted you with a bright smile. His recruit Nakajima Atsushi stood next to him with an equal happy expression.

"How're you (L/n)-san?" He asked with a small smile.

"So much better now that I'm out of the hospital." You said stretching.

"I bet you missed me Atsushi-kun." You teased as you poked his cheeks. He blushed in embarrassment while facing downward. You had a tendency to read your minors a lot like a big sister, once Atsushi joined the Agency he had become the victim to your teasing.

"I missed you!" Dazai exclaimed while raising his hand like a child.

"Why thank you Dazai-san!" You said gratefully.

"Um, by the way," You said with your cheeks turning pink. "Is Kunikida-san around?" You asked suddenly becoming shy.

"The workaholic? He went to do something for the head. Che he's so boring." Dazai complained, you and Atsushi both sweat dropped.

"Who are you calling boring?" Kunikida appeared out of no where giving Dazai a glare.

"You of course! You couldn't even put your work down to notice (L/n)-san had come back, especially after you told me how much you like-" Kunikida whacked in the head with his notebook to stop Dazai from confessing any further. You blinked at both of them, confused at what Dazai was saying.

"Like?" You repeated. Kunikida looked at you with a tiny blush and panicked look on his face.

"I-It's nothing!" He stammered. He held your hand in his as he lead you to his work space, mumbling something about Dazai being an idiot.
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You sat on his desk observing how organized everything was. Even though it has only been a week you missed seeing this place.

"Are you alright (L/n)-kun?" He asked adjusting his glasses.

"I'm fine, the doctor says this isn't anything fatal. I just need to take pills." You said. He felt relief flood him as he heard this news.

"But he also said this isn't going to pass. I could have more attacks happen in the future, especially if I engage in a massive amount of activity." You said as you gazed down with a slight look of sadness.

"If that's the case..you probably should stop going on missions." He said.

Your snapped your head at him looking at him like he had gone crazy. Stop going on missions? Sure you had a heart condition, but you didn't want to stop going on missions because that meant...you would spend less time with Kunikida.

"I don't want to." You said. He faltered as he saw a sort of determined look in your eyes.

"I'm not going to quit, just because I have this heart condition." You said.

"This is matter of your health (L/n)-kun. What if another one of those attacks happens when you're on a mission what would happen then?" He asked.

You thought about it for a minute before looking at him with a slight glare but determined look.
"I'll fight, fight with everything I've got. I'm not the type of person to just sit down and give up. I'd fight until fall." You said. Kunikida had this uncomfortable feeling grow up inside of him with that last statement.

"You're not going." Kunikida argued.

"I'm sorry Kunikida-san, but I'm not listening to you this time." You said.

"You can't.." He said sharply.

"Why not?!" You asked getting a little angry.

"Because!" He snapped at you with a harsh tone, one he had never used with you.
"I wouldn't be able to bear it! If someone I loved had died while I just...can't do anything." He said his voice trailing off in sadness. You saw nothing but worry and anxiety in his eyes as his expression became downcast.

Your face flushed as his confession played on your head like a recording. He...loved you, he loved you. Just like you loved him. Your heartbeat started beating not irregularly, but out of adrenaline, our of love. You rushed towards him tackling into a hug. He stumbled back in surprise, but quickly steadied himself as he looked to your form.

You looked at him with a smile on your face, "I'm not going to die." You stated.
Kunikida blushed but looked at you skeptically.

"How can you be so sure?" He asked.

"Because...it's like you said. You'll always be there to save me. And I'm going to expect it, so I know I'll be safe." You said. You snuggled in his chest as you felt nothing but love. He blushed deep red now as his composure fell. He wrapped you in his embrace as he held onto something he believed was precious, more precious than his beloved notebook.

You were right, he would always be there to save you, and Kunikida knew that well.

The two stayed there in their own little embrace as they listened to the sound of their pounding hearts.