Fukuzawa doesn't have much romance in his life, he honestly preferred to be alone, doing missions alone.

Though he met you a few days after meeting Ranpo, it felt like you two were parents of a very annoying and childish Ranpo. But.. He couldn't help but find the idea endearing.

Ranpo would always chat to you when he feels the need to flex—also for the extra praise since mostly everyone in the Detective Agency knows what a softie you can be. But Ranpo always has just seen you two as his parents, though biologically nor physically, he just imagines it.

Though, Fukuzawa finds himself slowly falling for you. It tries to deny it but finds his usual stoicism and sterness fading when you're near by.

When you patted his head with a murmur that you trust him. In the eyes of others, it is ultimately meaningless and silly. Yet, to him, that single gesture meant the world. And behind closed doors, he rests at ease, knowing his heart is in your hands.