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Chuuya can’t see them, probably doesn’t even know that they’re there, but there’s a faint line of scars tracing the length of his spine. They’re not the same as the other battle scars that dot his body – little more than long-faded clusters of barely there lines and dots – and Dazai never fails to touch them whenever he gets the chance.
Maybe he shouldn’t. There’s only one reason Chuuya would have those marks and it’s not a pleasant one; the scars are a tangible reminder of everything he endured during years trapped in the laboratory. By lavishing attention on them, pressing kisses on each and every scar as he works his way down Chuuya’s back, Dazai’s drawing attention to a part of Chuuya that he’s worked so hard to move past. Personally, Dazai doesn’t see a problem with it - they’re all part of what makes Chuuya his irritating, fascinating self.
Maybe he should tell Chuuya… then keep doing it anyway - it’s not like he ever listens to anything Chuuya says, and Chuuya enjoys the attention, even if he doesn’t know the real reason for it. But Dazai also likes the idea of there being something about Chuuya that only he knows.