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Dazai and Chūya deciding to get married was completely on a whim.
One day Chūya got home from a mission that he didn’t think he’d come back from. Dazai had broken into his apartment for the nth time, hoping to pull prank on Chūya, “Hey, Chibi! Are you getting shorter, or am I just growing taller?”
When Chūya saw Dazai after getting home, instead of yelling at him to get out, Chūya began crying and hugged Dazai. Dazai sat there confused for a moment as he caressed the smaller’s back. Chūya latched onto the taller’s coat, pulling him closer to hide his face. He was so consumed in his relief that he didn’t notice his hat falling off his head.
“Chūya, what happened?” Dazai moved his hands into Chūya’s hair, and began massaging. Chūya squeezed Dazai tighter. “Chibi, please don’t actually squeeze the life out me. I don’t think it’d be painless..”
“Dazai,” Chūya looked up at Dazai, and Dazai caught his gaze. Something’s different from usual , Dazai thought. “Let’s get married”
Dazai had known Chūya for 8 years. He knew his habits, his wants, his thoughts, and his beliefs. This was not a suggestion that Dazai had expected out of Chūya.
“Is this because of whatever just happened?” Dazai wonders aloud. Chūya’s eyes grow softer, and he brings his hand to Dazai’s forehead.
“Who cares if it is?” Chūya responds, moving Dazai’s bangs away from his face. “It made me realize something”
That night Dazai spent at Chūya’s place-the place he’d soon begin calling home. They got married the next day, and went in a little late for work. Neither one told anyone about it.