In this AU, the turtles are humans, and you're the mutant! You are their youngest sibling and live in hiding since mutants aren't accepted by humans yet. The brothers and their dad Splinter found you one day, and decided to raise you and take you in. You aren't allowed to leave the house and live in the attic. You can decide what type of mutant you are.

You were sitting in the living room with your brothers, silently reading while hearing the chaos

Donnie: Mikey, you totally copied off my homework!

Mikey: I did not!!

Raphael: Which one of you losers ate the last slice of pizza??

Leonardo: You guys need to chill out!!