You know exactly what it means. [ he smiles a little at him, teasing - but kaneki knows he is right.

he smiles wider as Katsuki tells him he loves him, and arms wrap around him while Kaneki approaches his lips of the other's ear. He kisses the skin there, then nibbles Katsuki's earlobe ] You know... If you behave and avoid making your wound worse, you can come home faster. And- [ he whispers now] I will let you be as shameless as you want.

[ it has been months since katsuki last saw Kaneki, right?? So he will give him that. ] But only if you do everything the doctor tells you.