You and Tsukasa had a pretty decent relationship despite how horrific he was, he provided you with protection when you needed it, and company.

He would come into your boundary casually since you didn't mind him all that much, he would sit and talk to you about his week excitedly while you continued your business.

He was also a bit of a cuddle bug, when you say down he'd lay in your lap, sitting in a chair to do work? He'd sit in your lap and lightly bite you while he yapped, he'd cling to your back like a koala on a tree.

Being friends with him you learned he loved to bit and chew things, you knew that when he bit you and left marks behind, it wasn't a sexually thing, just a stimulation thing.

One day you were sitting in your boundary, Tsukasa sat in your lap facing you as he spoke about everything going on so excitedly, you reaches out and held his face carefully, he leaned into it, a little confused. "My darling boy.." you whisper to him

And his whole face lit up like Christmas "Wh-what did you call me?" he asked now calmer and slightly surprised