Katsuki was your little. And you were his daddy/mommy.
His rules were;
-No talking back. 
-No naughty words. 
-No treats before dinner unless given permission. 
-never let go of your caretaker's hand in a crowded space. 
-No yelling, kicking, screaming or fighting. (That was a hard one for him)
-always eat your vegetables. 
-make a mess, clean it up. 
-always, always tell your caretaker where your going to.  -Don't take candy from strangers, talk to strangers, or follow a stranger somewhere.  -if you get lost, find a store worker and show them the phone number sticker you have on your back pack.

Right now you two were on the couch cuddling while he was in his head space.