So the idea for the scars came from a fanfic I read a REALLY long time ago back when I was first getting into TMNT fanfiction when the 2003 show was first airing, getting myself refamilarized with the original Fred Wolf cartoon since I had only really watched it during my preschool years so I barely remembered anything about it, so discovered a series of fanfics where 80s Donatello gets romantically involved with the Author's SWAT Kats OC and they have a daughter who's an albino turtle and she gets captured when she is a baby she lives in the Lab until she's a teenager and has ugly scars on her arms and legs before she finally gets free.

So Scarecrow called Jervis 'Mad Hatter' Tetch and Edward 'Riddler' Nygma telling them not to wear their costumes in his sanctuary, all he had told them was he found something that he believed both of them would find very interesting but he couldn't say anymore over the phone...Being they were all criminals Jervis and Edward accepted that explantion believing Jonathan must have found something really...Juicy.

By the evening, Jonathan informed Enna that tomorrow company was coming so she had to wash herself and change into some fresh clothes "I've already prepared something you can where tomorrow." He said

That was the first time he saw both fear and anger flicker in her purple eyes since she got here, Jonathan was not sure what wire he had tripped but he was determined to try to maintain control, but he feared she might mind trap him out of desperation.

"Take a bath I'll do." Enna said "But I'm putting these clothes back on when I'm done."

"Enna." Jonathan said calmly trying not to trigger her animal fight or flight instincts "You stink and those clothes stink, both need to be washed."

"No." Enna said folding her arms

"Enna..." Jonathan said "...What is it you're trying to hide?"

"It's nothing OK!" Enna said trying to leave the living room

Suspecting there was something she was hiding under her clothes, Jonathan hoping this wouldn't backfire, quickly grabbed the sleeve of her gray hoodie and pulled it back...

What he saw...Even though it was something he suspected, made him pull back and gasp!

For from her wrist to her shoulder, her arm had been mostly sahved and had one long, deep ugly stitch along it's entire length, all signs pointed that it had happened recently.

"You happy now?!" Enna said angrily "I got another one just like it on the other arm!" She rolled back her other sleeve to show it was exactly the same on her left arm, "And on both legs too!" She pulled up the pant legs to show each leg had a stitch.

"Enna..." Jonathan said "You...You shouldn't have tried to hide these scars, you should have told me..." So deep was his shock he could only think "What was the purpose of cutting your arms and legs?"

"I don't know!" Enna fumed "They just decided to do it for some reason..." Jonathan suspected Enna knew a bit more than she let on even if she didn't know everything. Jonathan wouldn't push anymore on that now.

"Well..." Jonathan said "...Speaking from experience, it's a good thing I saw these scars before you cleaned yourself...Were you going to get into the tub?"

"Yes." Enna said

"I know from experience you should never soak your stitches in a bath." Jonathan said "You should only use the gentle spray of the shower, and you must carefully dry the stitches afterwards, I...It's clear I need to help you wash yourself safely."

Enna gave no further objections now that Jonathan had seen the scars.

Getting into the bathroom, Jonathan was grateful he had invested in a shower cubicle large enough for both of them, he was only wearing underpants and an undershirt and he wasn't the kind of person to have any kind of swimwear, the beach was not the place for him, he burned too easily, Enna undressed herself, Jonathan trying to look as quickly as possible took a quick peek at her chest to see if she...Was in anyway like a human girl at that sense, but no, her chest gave no indication it would grow human like breasts, Jonathan was beginning to rethink his idea she was a hybrid of human and animal DNA maybe she was just an...Advanced animal, whatever the Athena mixture was pushed whatever creature it came in contact with towards the human.

And Enna seemed not bothered by being naked in front of a male human, seems it was just her scars she wanted to conceal with her clothes, she didn't have the human concept of body modesty...Jonathan supposed he couldn't blame her for feeling shame about her scars.

As they got into the shower, Jonathan turned on the water, and he pushed and pulled Enna back and forth from the water stream to keep her stitches from getting too wet, Enna just seemed to be enjoying the pleasant touch of the water.

Getting the shampoo bottle Jonathan realized that there's a reason pets have their own seperate shampoos, something about animal skin's not having the same pH leval as a humans but for now this would have to do, he lathered up Enna's tousseled mop of black human-like 'head-fur' that was different from the fur on the rest of her body deep chococlate brown with cream on the undersides, and her upper back.

"That shampoos smells nice." Enna sighed as he lathered up her back

Jonathan looked at the bottle "Lavender scent, a calming scent isn't it?"

Finally after throughly drying her off, Jonathan reaveled he had taken an old sheet and made her a nightgown that went down to her feet, so she would be well covered as this was what should would wear tomorrow, it had no sleeves so her arm scars could be seen but Jonathan said "Let them see your scars they should know about it."

"It does feel nice." Enna said feeling her new nightgown "Will be a lot better to sleep in this, but why do humans wear clothes when they sleep?"

"A few reasons." Jonathan said "Sometimes humans must sleep with other humans who are not kin, don't care for those humans to see them naked and in case of there is an emergency during the night and no time to get dressed, better than running out naked...But in a way you're right, Pajamas are actually a fairly recent invention in human history only really took off in the 19th century two centuries ago."

"You're really smart." Enna said "Most of the scientists couldn't answer half the questions we asked."

Jonathan couldn't help but beam at that praise, he had felt he would have never wanted to teach young children because he couldn't stand children but already he was beginning to see the charm a well mannered child could bring

So like many other stories I imagine this story takes place around 2006 after the Turtles fought the Tengu Shredder