From a young age, you already knew the world was cruel and uncaring, it was kill or be killed. So you joined the Port Mafia and worked your way up to a good rank. You'd be fifteen around now. Going on missions, killing, then going to your cheap apartment, and the cycle continued. You would usually work alone... until some kid joined. Chuuya Nakahara.
Mori, even though Chuuya was supposed to be Dazai's partner, wanted you to go on a mission with him. You got the information on it and so did he. You were expecting the weather to be decent, not to do a full 180 and suddenly start snowing. So now you're walking around the snow, occasionally having to walk in the snow too. It was freezing and you were shaking, though you were too stubborn to ask Chuuya if you two could maybe take a break or find somewhere to stay.
Chuuya still noticed, to your disdain. And you tried to ignore it since he didn't say anything and kept walking. You could see your skin changing slightly, to a small light blue, how long had the two of you been out in the snow...? Never mind. You suddenly felt something warm wrap around you, and you glanced at Chuuya, who'd taken off his jacket and wrapped it around you. He had pulled up the hood of his hoodie and kept his gaze away.