A/N: WARNING! This oneshot is NSFW. If NSFW is not your thing, feel free to skip this chapter, or proceed with caution. As courtesy, I have also written a SFW oneshot for Dazai's birthday as well as this fic, so y'all can enjoy the best of both worlds, or have something to fall back on if you don't like NSFW.

This is also my first ever time writing NSFW, so please forgive me if it's not good. But I hope y'all can enjoy this regardless.

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He hears the wails. He sees the red. He feels the shuddering of the ground beneath him.

He knows what this means.

Corruption.

Dazai has never run as fast as he does when Chuuya uses Corruption. He can't let his precious chibi die. Despite the two going separate ways, they each have been the one constant in each other's lives. Neither could bear to live without knowledge of the other still living as well. So when Dazai feels the tremors of Arahabaki, all he feels is adrenaline.

Following the screams and the glowing red, Dazai finds Chuuya, shrieking like a godforsaken banshee, forming a graviton.

Dazai inhales sharply. This is bad.

The brunette hastily grabs onto the redhead's arm, bringing him back to his senses the moment No Longer Human gets its mitts on that horrible demon inside his beloved chibi.

As his consciousness returns, Chuuya trembles and collapses to the ground, a normal thing he does post-Corruption. However, the blood he coughs out and the fists he balls so hard he breaks his skin are most certainly not normal.

"Shit, Dazai...make it stop already, you idiot…"

Dazai crouches down and holds the shorter man in his arms. "I did make it stop. I nullified Corruption already. You're okay, Chuuya."

"Dazai...it...it hurts...make it fucking stop!"

"But I did."

Chuuya squeezes Dazai's arm weakly, trembling, until he suddenly goes limp.

Dazai's worst fear has come true.

"Chuuya, no, no!!"

Dazai wails in despair, violently shaking the redhead in his arms in a futile attempt to wake him up.

"Chuuya...please, don't leave me…"

"Dazai!"

Dazai's eyes quickly open as he feels something loud in his ear. He realizes now that he is no longer in the rubble, holding his fallen, bloodied ex-partner in his arms; rather, he is in the king-size bed he and said ex-partner share. He is not in his trenchcoat; rather, he is wearing a loose T shirt and shorts, bandages still on. 

Must've been a dream. A damned, lifelike one at that.

The brunette rolls his head over and sees that redhead beside him, leaning over him and holding his arm, a look of concern in his eyes.

"You were screaming my name in your sleep. Nightmare, huh? Are you okay?"

Dazai responds by wrapping his arms around Chuuya and pulling him into an embrace.

"Chuuya...please, never ever use Corruption without me there."

Chuuya sighs. Those words were an answer enough on their own. Dazai often has nightmares about losing him to Corruption. Chuuya wishes that man wouldn't be so afraid of his potential recklessness.

He kisses Dazai's forehead. "Osamu…"

He climbs on top of him and then kisses him on the lips repeatedly, in between each sentence he speaks. "You know that I'd never use Corruption without you. I love you too much to take that risk. I promise you."

Chuuya licks at Dazai's lip as if asking for entrance. When the brunette parts his lips as a green card, the redhead slides his tongue in, lovingly tasting the taller man.

"Thank you, Chuuya…"

Dazai's words are muffled coming out of his mouth.

Dazai's hands wander into his lover's hair, pulling slightly as Chuuya deepens the kiss, occasionally pulling back for air, only to press their lips together once again and run his tongue over the brunette's soft lips and swirl around the inside of his mouth, thriving on the sweet little noises Dazai lets out at his more rash actions.

It's when Chuuya feels something hot and hard press against his pelvis that he pulls back for more than a second.

Briefly, he's startled by the sudden feeling, moving his head back and waiting for the strand of saliva connecting the two of them to break before a smirk dances across his own lips.

"Already, Osamu? You just woke up."

Dazai shifts around, adjusting to his lover still pressed against him paired with the uncomfortable hardness in his shorts. "It's not my fault that Chuuya gets me all worked up~"

Chuuya sighs for show, smile still on his lips, as he straightens his body until he's straddling the brunette. He grinds his hips down as a tease, relishing the soft moan Dazai lets through his lips. "Now, now, I'm not doing anything until you tell me what you want."

Even more teasing.

Dazai groans. He never likes asking for what he wants directly, but Chuuya adores hearing the words from him, and Dazai knows he will not get what he wants until he caves. He curls his fingers into the sheet, face already turning red.

"Chuuya, please...please fuck me…"

Chuuya smirks, grinding down once again. "There we go. Now, won't you be a good boy and get me the lube out of the nightstand? I'm sure your lovely long arms can reach the drawer just fine."

Dazai groans again, reaching over to the bedside nightstand and fishing out the bottle of lubricant his lover requested, handing it to him, face redder than before.

"Thank you, darling."

Chuuya takes the bottle from the brunette, raising his hips to pull off his own shorts.

"Hm hm, I must say, you look quite adorable, all flushed like that. Now, take off those shorts for me, Osamu."

Dazai does as he's told, raising his hips to slip his fingers under the waistband and pull his shorts down to his ankles, struggling to not get distracted by the stunning view of his lover's length. Since they were partners, Chuuya had always been well-endowed, being bigger than Dazai despite the drastic height difference.

Chuuya scoots back a bit, chuckling as he notices where Dazai's eyes are aimed. "Now, normally I wouldn't do something like this, but it's your birthday. My lovely Osamu shouldn't have to start his birthday with a nightmare, so I think I'll do something extra special."

Dazai fiddles with his fingers as he struggles to meet Chuuya's salacious gaze. "Wh-what is Chuuya going to do for me?"

Chuuya closes his eyes as he pops the cap off of the lubricant, pouring a generous amount into his hand. "Today, I am going to ride you until I feel you come. I should get to feel something inside me once in a while too, right?"

Dazai moans and Chuuya's lewd words. 

"Hm hm, what a cute sound that was."

Chuuya chuckles to himself lightly as he closes his hand around the brunette's cock, slicking it up carefully, drinking in the way Dazai is already shuddering. It breaks Chuuya's heart how quickly Dazai starves of any form of human contact, but he knows that this time, it's not merely due to that that causes the brunette's shivers. 

Whilst he slowly strokes his lover's length, he scoffs, pulling the shorts and boxers around Dazai's ankles down and off him completely, tossing them to the floor. He knows not to touch his bandages. But he knows as well that it's okay to touch the shorts, especially in a moment like this.

Dazai wraps his arms around Chuuya, digging his fingers in the fabric of his shirt, already breathing heavily. "Please, Chuuya...just do it already."

Chuuya chuckles again, letting go of Dazai's cock. "Ah, how could I ever refuse when you ask so nicely?"

Moving forward and straddling the brunette's hips again, he slowly eases down on the taller man's erection, inhaling deeply at the feeling of being stretched open. Dazai lets out a loud beckoning sound at the sensation of Chuuya on him, clawing deeper into his shirt until the redhead swats his hands away.

"Mm, Osamu...you feel so good inside me."

Dazai's face reddens further and he moans again. Chuuya always knows exactly what to say to get his motor running.

Dazai chews his bottom lip and does his hardest to keep another embarrassing sound behind his teeth as Chuuya begins to move up and down in a most pleasurable rhythm.

"Chuuya...take off your shirt, please."

Chuuya opens his eyes and smirks. "Ah ah ah, if you're keeping your shirt on, I'm keeping mine on."

He slips his middle finger under the bottom of his shirt as he continues his movements, slowly sliding the shirt up to reveal more of his finely tuned chest. "Besides, isn't it more...tantalizing if I keep it on, only leaving your mind to imagine me fully naked?"

Dazai groans at the sneak peek Chuuya gives him of his torso before he moves his hand and lets the black t-shirt fall back down, covering him once again.

Following this, Chuuya closes his fingers around the hem of Dazai's shirt, lifting it up to reveal his pale chest, clear of bandages. He predicted this, that bastard.

Chuuya's eyes dart to his lover's nipples, moving his hand to poke at the bud, adoring the way Dazai throws his head back at Chuuya's contact with the sensitive spot.

"Y'know, Osamu, I've always thought you had the cutest nipples."

Chuuya purrs as he rolls one in between two fingers.

"They're pinkish, and supple, and the perfect size."

Dazai moans at the touch and Chuuya's words. The shorter man's hand moves to Dazai's other nipple, pinching and massaging the bud, drinking in every noise and thrash Dazai makes.

"I also adore the way you react to me doing this. Fuck, Osamu, you're perfect."

Chuuya's free hand moves down to his own neglected cock, taking it in his hand as he begins to pump it. Dazai's eyes move south to that area and he whips his head back at the sensations and views he's experiencing.

Dazai digs his fingers into the pillow his head rests on at the low moan Chuuya lets out from the movement of his hand, while still keeping the pace with his hips, going up and down on Dazai's length, gifting the brunette with the pleasure he deserves.

Chuuya swallows heavily and looks into Dazai's eyes, a smirk forming on his lips. "I'll bet you're loving this, aren't you, Osamu? Getting to watch me jerk myself off while I fondle your nipples and fuck myself on your dick? I'll bet you're in heaven right now."

Dazai moans again in response.

"I make you feel good, don't I, Osamu?"

Dazai bites his lip and swallows a moan as Chuuya slams down on his length particularly hard at a lack of response.

"Well, Osamu?"

Dazai gives in upon a second hard pound on him, voice practically yelling. "Yes! Yes! Chuuya makes me feel good. So good that I feel complete with him on top of me, fucking me! Nobody has ever done me this well, Chuuya. Nobody can make me feel good like you. Don't stop, Chuuya!"

Chuuya throws his head back slightly at Dazai's words. "Fuck, Osamu."

The redhead leans down as he continues to ride on Dazai's cock, pressing a kiss to his lips. A large contrast to the sensations Dazai is already receiving, the kiss is slow, gentle, and loving. Dazai sighs into it and kisses back, not even caring he can hardly breathe. This is ecstasy for him right now. No form of suicide could make him feel half as happy or complete as he does right now.

Dazai forces himself to pull back slightly so as to catch his breath (or at least, attempt to), and so he can speak. The gorgeous, prurient look in the redhead's eyes is making him lose his mind.

"Chuuya, please…"

Chuuya grins. Watching the usually cool and collected ex-Demon Prodigy utterly break beneath him, begging, makes him feel happier than practically anything else could make him. "Please what, bien-aimé?"

Dazai pants as he loses his fingers in Chuuya's hair, astounded how the redhead, despite leaning over him, can still continue his ministrations on both Dazai's and his own lengths. "Please...say my name again. I love the way it sounds rolling off your tongue...please, Chuuya, call me Osamu again. Over and over again. Please."

The redhead chuckles again. "Hm hm...I could never refuse you when you beg like that."

Chuuya places one more fleeting kiss on the brunette's lips, then straightens his back, hand leaving the brunette's chest, causing the brunette to whimper cutely, and he grinds down especially hard, warranting a loud moan from Dazai.

"Osamu~"

Dazai moans again at the way Chuuya draws out his name, at how Chuuya can make his name sound like a sin rolling sweetly off his tongue and rasping Dazai's spine.

Chuuya rolls his hips again and continues to jerk himself off, as if trying to taunt the brunette even more, not missing the pleading look Dazai gives him. "I love how red your face gets when you're embarrassed or turned on, Osamu. You're so cute, so perfect for me."

Dazai inhales sharply through his teeth, squeezing his eyes shut, as his fingers dig into the sheet beneath him. "Ch-Chuuya…"

"What is it, my love?"

Dazai opens his eyes and they meet Chuuya's gaze, his whiskey-colored orbs gazing in desperation. "Dammit, Chuuya, I...I'm so close. Please, Chuuya, let me come…"

Chuuya throws his head back and laughs. "I'm most certainly not stopping you, Osamu. I never finish before a lady."

Dazai whines at the taunt.

Chuuya rolls his hips down even harder and lets out a loud moan as he feels the tip of Dazai's cock brush his prostate and that does it for Dazai. He screams as he feels himself release into the shorter man on top of him, squeezing the bedsheet so tightly his fingernails meet his palm and biting his lip so hard he can taste blood. Upon feeling Dazai fall over the edge, Chuuya joins him, releasing his seed all over Dazai's torso, Dazai groaning at the warm liquid cooling on his skin.

Chuuya sighs, rising off of the brunette, wrapping a hand around the flushed length and jerking it until the brunette is milked of all of his come and is left whining from overstimulation.

Slowly, Chuuya lets go of Dazai's length, reaching over to the nightstand and gathering tissues, lovingly wiping the brunette down until he is clean, smiling at him lovingly.

"Did that feel good?"

Dazai's face is still hot and red as Chuuya bends down to the floor, still seated on the mattress, as he grabs their discarded shorts. "Yes, Chuuya. That felt a-amazing. Thank you…"

Chuuya smiles again, pulling his shorts back on and leaving Dazai's beside him on the mattress as he fixes Dazai's shirt and lays on top of him again, kissing him on the tip of his nose. "Happy birthday, Osamu."

Dazai smiles back, tilting his head up so Chuuya kisses his lips. He sighs into the kiss as he toys with auburn locks upon his lover's head.

"I love you."

I love you.

The words echo back through the brunette's cranium. Love is a difficult concept for Double Black. After all their rough times, bumps in the road, betrayals and reconciliations, love felt like it was lost to them. And yet somehow, they put the pieces together, and managed to find it. And now that they have, they will never let it go.

"Chuuya, I...I love you, too."