You were abandoned by your real parents when you were still a toddler: you were left to your fate in the sewers when Splinter found you, taking you in as his adoptive daughter. He loved you like you were his own, just how he loved your four turtle brothers.

You grew up together basically not even questioning your differences till the age of 10, when Don got curious and wondered why you weren't green or had a natural shell, getting all the others curious as well. But that still didn't change your relationship. To make you able to roughhouse and play with them Donnie had the idea of making you your own shell with pillows, but when he grew up it became more sophisticated and he turned it into a proper combat turtle shell.

You being an human was kinda handy, since you could easily go to the surface without much problem and get the groceries or anything else they might need from the surface, while checking you were ok by following you hiding on the rooftops.

As you all grew up you started going on your own… and sometimes you got into trouble. And that’s how you met Shredders son: he was an enemy yes but something between you two was different. You two met in secret, hiding from both your families, but subtly you both tried to change the others mind.

You knew it was wrong, but he was just… so… you couldn’t even explain it but every fiber of your being wanted to be close to him, even if you hated him because he had tried to hurt your family many times.

Your family wasn’t stupid though, they knew you were hiding something, and sooner or later Donnie started to track you down after Leo got worried about it, since they had no idea what you were doing.

One day they followed you till your usual meeting spot on top of a tall building, which normally leaded you to an abandoned warehouse… to which you… “spent time with eachother”. They silently all followed you to see where you would go… not expecting who you were gonna meet with…