Leo's POV
We were exploring the sewers since we were only 5 years old. I heard a cry of a baby and said "Guys we need to find that sound". We followed all around the sewers until I saw a box with a pink blanket in it. Not only a blanket, but a baby! "Sheesh what is that thing?" Raph huffed.
"Raph it's a baby girl of some sort. We should take her to Splinter." I said picking her up. We walked back to the lair and went to Splinter. "Dad Leo brought a monster in the lair!" Mikey said. "Mikey she's not a monster!" I yelled which made her cry. Splinter took the baby and calmed her down.
"She's a baby human. Where did you find her?" He asked. "In the sewers." We answered. "Was she alone?" He asked. "Yes." we replied. "Well now she is your new baby sister." He said.
"Yay!" We cheered. "What should we name her?" Donnie asked scratching his head. "How about . . . (Y/n)." Splinter said. "Yeah." We replied. She was really cute.
I held her in my arms and poked her nose making her giggle. Mikey started making his funny faces which made her start to laugh. Raph started to chase Donnie and that made (y/n) laugh uncontrollably. "Welcome to the family sis".
