This story takes place after the end of 'The Invasion, Part 2' It's basically a continuation of the ending scene. This also ignores any future episodes.

…

Harmony

Splinter shifts slightly as he awoke from his sleep. He looks around and he notices he is in the sewer. He questions what he is doing here when he remembers his fight with Shredder, the Kraang invasion, and the last time he saw his sons. The looks of horror on their faces didn't calm his mind as he thought about what they might be doing now. He could only hope they have escaped the city and haven't been taken out by the Kraang.

Splinter suddenly feels a weight on his chest move and he looks down to come upon the sight of his mutated daughter, Miwa, sleeping. He looks behind him to find that he was resting his head against her tail. She's resting her head on his chest, breathing peacefully while flicking her forked tongue out every so often. He realizes she must have saved him from drowning and was too worried about him to leave his side. Despite the fact that the snake is a natural predator of the rat, Splinter feels no fear from being so close to the serpentine mutant. He wonders if she actually remembers him, or her memory of him is just her instincts that made her recognize him.

He then hears a hissing sound and looks down to see Miwa has awakened. She looks at him and says, "Father, you're awake." Splinter looks into her reptilian eyes and realizes his beloved daughter is still present in the creature before him. She then hugs him and he hugs her back, crying tears of joy. Splinter says, "Miwa, I thought I lost you again." He rejoices in the fact that his daughter's mutation hasn't turned her into another mindless beast like the other mutants he's seen or the humans on the surface that have been mutated during the invasion. They hold each other for what seems like hours, Splinter never letting go of his child, fearing that if he does, he'll lose her again. Splinter says, "I'm sorry for everything you had to go through, my daughter. I should have never told you the truth about your mother." Miwa says, "I do not blame you for anything, father. Not even my mutation. It's Shredder I blame." He can only imagine what the last few weeks have been like for her. Isolating herself from humans, surviving on her own, and getting used to her new body must have put so much stress on her. Despite how happy he was right now, he still mourns how his own daughter has been subjected to the same fate he was given over a decade ago, and at such a young age for her too. Splinter says, "Thank you for saving my life, Miwa." He then says, "I have been so worried about you, daughter. Why did you not come back to the lair? I would've been able to help you with your mutation."

Miwa then says, "That was the problem, father, you wouldn't have been able to help me. After I saw myself constricting you and how close I was to hurting you, I wanted to stay as far away from you as possible until I could sort myself out. I decided to survive by myself until I knew I could fight my new instincts, and I could keep myself from hurting you. I was actually thinking of returning home after a few more days, but I guess the lair is no longer an option."

Splinter then hears what sounds like Kraang droids coming down one of the tunnels. Miwa turns towards the tunnel and hisses. Splinter moves to get up but a sharp pain erupts from his side. His daughter pushes him back down and says, "You're still injured father. Rest and let me take care of this." Miwa starts to slither away and Splinter gasps, "Miwa, please! Don't leave me!" He may have lost his sons during the invasion; he didn't want to lose his daughter as well. She turns around and says, "I'm not leaving you, father. I shall return." She then slithers down the tunnel to confront the Kraang. Splinter rests a little and touches his side where the pain is coming from and seethes as he feels the sting of his injuries from his confrontation with Shredder. He hears the gunfire of the Kraang and the hisses of Miwa from down the tunnel, and he watches a decapitated Kraang droid head roll down the tunnel. He sees his daughter return and says, "Now the Kraang are after me." Surprised, he says, "What do they want with you?" She replies, "Probably to return me to Shredder." His daughter lies down beside him in the same position she was in before, with her tail behind her father's head so he can relax, and her laying her head on her father's chest. Splinter rests his hands on her head and starts to fall asleep, grateful that he still has his daughter.

…

I created this because there are no stories that are just about Splinter and Miwa, which is something I really love about this version of the cartoon, and I felt sad that there are no stories on this website that shows the love between a father and a daughter with these two.

Why did I call her Miwa? Because I feel Karai is just a reminder of the way Shredder treated her; like a weapon to inflict harm on his archenemy. Also, it's the name her real father gave her.

If you didn't get the title, Harmony in Japanese is 'Miwa'

If I ever feel like it, I may create a sequel to this in the future.

PS, if anyone reading this is also a follower of my main story, I'm working as best I can to post the next chapter. My college life makes it really hard to work on my stories.