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He should've noticed it sooner.
He should've noticed the first second Dazai looked at him, dammit.
Those dark and dead eyes, that fake smile and deadly smirk, everything, he should've noticed something. What a fool he was.
It started right after their first mission together.
Chuuya was covered in blood and dirt, Dazai was no better. The redheaded teen huffed and began to wipe off the grime on his uniform, wiggling his hand in the air so the substances slapped onto the ground and off his fingers with a sludge.
"We done here?" He asked as he turned to his partner who was looking at him out of the corner of his eye. Chuuya blinked, confused. "Dazai?"
"Yes," Dazai instantly responded, shaking his head a little. "Yes, we are. Just...one moment." He pulled out his gun from behind him and walked over to one of the bodies about ten feet away from him. Chuuya huffed again, crossing his arms.
"He'll bleed out in a few minutes, shitty-Dazai," He said, clearly impatient. "Let's just go. I need some wine."
Dazai hummed, but otherwise, walked over to the man bleeding on the ground.
"Yes, but," The older teen began, cocking his head to the side. "This man, he touched you." Chuuya raised an eyebrow before blinking again and holding up a hand to cradle his cheek that was starting to bruise.
"So?" He asked. "He got a good lick in, it doesn't matter. Come on, let's just leave."
Dazai ignored him, crouching down next to the man.
"You don't get to touch what's mine." He whispered so softly that Chuuya couldn't hear, and pointed the gun at his head. "No one will ever touch what rightfully belongs to me. Understand?"
The man under him heaved, eyes wide with fear and tears.
"Plea-"
BANG!
*
The constant touching and eyeing was another warning.
Another giant red flag, was that he caught Dazai sneaking into his room in the middle of the night to do God knows what.
He didn't let the teen stick around to find out.
After that, he didn't go to sleep for almost three days.
Now, they were eight-teen and full of hormones, constantly arguing with one another and spitting insults every chance they got. Well, more like Chuuya did, Dazai just kind of replied back casually, but his eyes were always full of mirth.
"Chuuya, dear," Kouyou said one day, eyeing him with concern as he finished up a few more pages of paperwork. "I've...come to notice that Dazai-san tends to become....overprotective of you, so to speak."
Chuuya raised an eyebrow. "What?"
Kouyou grunted into her fist. "It's not like it is a bad thing, well," She paused. "Perhaps, it could be. Just...be careful, alright?"
Chuuya looked away for a moment before looking back. "Uh..." He was totally lost. "Um, okay, Ane-san. I don't know what the big deal is, but, I'll be....careful."
She nodded, looking distressed for a moment before eyeing the area around them as though she was afraid someone was watching before giving him a strained smile and nodding before walking away.
Chuuya watched as she did so, completely lost and left confused.
*
"Dazai..." Chuuya began, eyes wide as he stared at the bloody mess that was Mori's office, hand trembling against the door as his heart stopped, horrified at the scene before him. "What the hell have you done?!"
Dazai, from where he was crouched down on the ground next to (oh God, that was Ane-san, that was Ane-san) Ane-san's bloody and broken body, looked up and smiled brightly as he laid eyes on Chuuya. "Chuuya!" He shouted before standing up quickly and taking a few fast steps over to the other boy, the younger yelping and falling back.
Dazai stopped, smile fading.
"What the hell....what..." Chuuya could barely comprehend what he was saying, a hand running down his face and gripping his skin as he shook in fear. "What the fuck have you done!?"
Dazai's smile returned and he gave a little giggle, twirling the completely engulfed in blood knife, in his hand.
"I've cut our strings," He answered. "Now we're free."
Chuuya shook his head in total exasperation, not even looking at Dazai, even as the teen walked over, dropping the now forgotten knife onto the ground and slowly shutting the door and locking before coming to sit down next to him, wrapping his arms around his waist as he nuzzled his neck.
"We're free," He repeated. "No one can touch us now."
Chuuya choked on a sob and Dazai cooed, reaching up to gently thumb away his tears. "It's okay, it's okay." He said. "It's just the way things had to be, you understand, don't you? It was the only way for us to be together."
Chuuya's hands trembled. "Ane-san..." He whispered and Dazai kissed his cheek.
"She had to go." He said. "She interfered with my plans. She wanted to keep you away from me." He growled. "She made her choice."
Chuuya shook his head again, another tear rolling down his cheek.
Dazai smiled, hugging him more tightly.
"Now, we can have our happily ever after. With Mori gone, I can take over the Mafia and no one will ever hurt us again."
Chuuya felt his heart stopping and Dazai's smile turning sickeningly sweet.
"And we can be together, forever..."