Splinter goes up to Y/N first and starts checking up on them to see if they weren't hurt or anything. "I've been freaking out; all you aren't hurt, right?" He asks, but Y/N shakes their heads. The turtles kept making excuses about their whereabouts and walked away from the situation. "Wait a second." Splinter says the turtles freeze in their spots.
"You guys said you'd go shopping and then you'd come right back," Splinter points out. "Technically, Mikey dragged me out, but whatever." Y/N thought to themselves, "Where were you?" He finally asks, and the turtles try to make up a lie, but Leo couldn't take the pressure anymore. Look, We're Really sorry, Master Splinter, But Some Of The Guys Wanted To See a movie, And I Tried to Talk Them Out Of it," Leo explains.
LEO!" The turtles shout at him in disbelief, "What!? You Watched A Movie With The Humans, Ugh!" He exclaimed in genuine disgust, "Dude, you ratted us out!" Mikey exclaimed, but Splinter snapped, "Hey! Don't use that word that way." He says, "Well, it's 2023, dude," Leo says, and Mikey apologizes.
"It Wasn't That Big Of A Deal! We Just Watched A Movie And Came Back; We're Fine!" Donnie exclaimed, but Splinter wasn't having it with their behavior. "Hmmm, you forgot, huh, you forgot why humans are disgusting monsters? Why are they dangerous? Why are they going to milk us for our blood?" Splinter exaggerated; the boys groan while Y/N stays put, like usual.
"We Don't Even Have Nipples!" They all shout back. "You Know What, I Gotta Tell The Story Again, About How Humans Are So Cruel That They're Willing To Abandon Their Own Child," Splinter says while gesturing to Y/N, "Oh, this story again..." they thought, and the boys groan even more from this repetitive story.
An framed picture on the wall shows the family back when they were young. Splinter was holding the turtles around his arm while Y/N was happily laughing while being wrapped around splinter's tail, dirt and crayon markings all over their R/C skin. "And just for that, I tell you the long version, hehe," splinter chuckled.
15 Years Ago...
"I was a young rat in my 20s. I mean, look at me. I was so cute. I was on top of the world. No! I was at the bottom of the world," Master Splinter exaggerates as we see his younger days; many of his peers rejected him. "It was Terrible! Nobody liked me. I had no friends; Raccoons never liked me; dogs didn't either, but you know who hated me more?"
The turtles all sighed as they reluctantly listened to the story Humans." They groaned; even though they knew the story meant a lot to their family, it was tiring for them to hear it repeatedly. Splinter stroked his beard and said, "Yes, I had one friend; he was a cockroach. We got along very well... until he died, then I ate him."
Ew!" Mike exclaimed. Quiet!" Splinter glared at him. The turtles groaned more. "Anyways, one day, everything changed." It shows Splinter climbing down into the sewers as a means to avoid the harsh rainy weather, but what he finds is unexpected: four baby turtles all covered in a mysterious green ooze.
One of the turtles approaches him, and Splinter gets on the defensive, moving in front of the nearest food source and attempting to growl it away, but to his surprise, it wasn't phased at all; if anything, it was amused. The turtle crawled up to him and snuggled him, saying, "You were the first thing I met that didn't want to kill me or eat me."
Splinter drags the turtles in a cup holder into a more dry area. "I couldn't just leave you there. But you were covered in this ooze that someone dumped in the sewers. Whatever this ooze was, it transformed us." Splinter's eerie transformation was shown in the shadow: "Because I was older, I became an older rat."
Splinter looks down at his new body. He was shocked to see that he was standing on his own two feet. The strange ooze transformed him into a human-like being. "You guys were babies, so you stayed, baby turtle creatures; when you think about that, it couldn't make more sense."

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Mutant Mayhem: Reader Insert
Fanfiction15 years ago, while Splinter was scavenging around the deserted streets of New York City for Supplies, he stumbles upon an starving human baby, all alone and abandoned. In the present day, after years of being sheltered, Y/N, a 15 year old human and...
CHAPTER 2: Family History
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