Uchi no Musume no Tame Naraba, Ore wa Moshikashitara Mao mo Taoseru Kamo Shirenai. (Novel)

From Konobuta:

He met a girl. A young girl branded with the mark of a criminal. That was the beginning of everything. “Crap, my girl’s so cute” This is the story of the two who became an overly protective guardian and an adopted child, changing relationships, and furthermore until how that relationship evolves.

Original Web Novel