Fics like Growing a backbone

What do you get when you cross Luigi with a mysterious potion that has unknown ingredients and origins? You get turned into a Koopa. Indefinitely. Now, as Luigi lives among Bowser, his troops and his children in the koopa kingdom, he has to face some interesting feelings about himself, and the guy who he's supposed to hate. Turns out, being turned into another creature, really brings a guy out of his shell, hah. But seriously, how can you hate a guy who you have to live with for months?

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