Chuuya didn't remember anything from when he was a child. Literally, after being merged with Arahabaki, all of his memories before the age of 7 were gone. Then just that stupid lab, then Sheep, Port Mafia, Dazai leaving PM, the workload as one of the Port Mafia executives ...He practically didn't even have time to think about what childhood was like.
And he didn't want to. Neither Ozaki, nor Doc, Lippman or even Verlaine, when he joined Port Mafia, had shown him, so he dismissed the questions as stupid. Still, he was curious about what it was like. The so-called "carefree moments."
But he never had a chance until you joined Port Mafia. You were mostly an assistant, carrying papers here and there for the entire PM. That's how you became his friend because you had a passable personality according to him. You, on the other hand, accepted his temperament.
You don't know why, but he was interested in you. Probably because of your ability and the fact that you put up with him. You got along well, even despite the difference in hierarchy in Maffi.
You liked to go out, and he liked to go with you. He could go out by himself and do whatever he wanted, but your pastimes were like those on Wikipedia when he typed in "what childhood looks like." So he didn't want to miss such opportunities. Of course, Ozaki and Mori noticed it, but they kept their mouths shut.
From ice cream to arcades, amusement parks, galleries or cinemas, playgrounds, parks. He was happy . According to you, he sometimes even acted a bit more like a child or a person, letting down his usual guard a bit.
Today after work at Port Mafia you decided to take it out again and Chuuya of course wanted to go with you. You still addressed him as executive, but he told you to speak to him normally outside of PMs. It was rare to see him this open. Although it's no wonder, he was just reliving "his childhood" thanks to you."