I can't remember the name but a accountant man, just divorced, finds the grown up version of the child actor he loved. He's a man but he doesn't care. The accountant from then on follows the old child actor everywhere. Including back home

I don't remember much but these details. It was a super good manga. Please help.

Try "Sweetie" (Chapter 3) from Ookami no Ketsuzoku by Inoue Satou.