Fics like The King and The Little Bastard.

Katsuki is the pissy, hissing show cat that only lives for the lavish life, while Izuku is the tiny, quivering ball of fluff that digs through trashcans to survive. Kirishima loves them both. - It had honestly been a coincidence when finding Izuku. Kirishima had been on his way to work, locking the door behind him, looking down to see a black mound on Katsuki's outdoor bed when Katsuki decided to 'brave the harsh and deadly wilderness' and go outside. (The bed has never been used.) Kirishima didn't pay any mind to the shaking, tiny lump in Katsuki's outside bed before taking a second look, seeing bright, teary green eyes look up into his soul. BAM. Critical hit to his animal-lover heart. - or; the bkdk cat au nobody asked for but i gave because I'm weak for animal versions of my fav characters

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