Everyone gets stunned. Especially Donatello, who thought he had alarms all over the place.
"But how? I mean... I have..."
"I have lived there since I was a kid. When you installed the alarms, they automatically set up themselves to that I was one of you."
"But why haven't you come to us before?"
She hesitates, "Because I wasn't ready. I was not so good at ninjutsu, and I thought at I had to prove myself worthy your trust."
"Prove yourself worthy?"
Splinter looks at Yosha.
"Yes. Though, it did not went as I had planned..."
"You don't say..."
Raphael crosses his arms. Splinter looks at Raphael.
"What?"
Splinter shakes his head and then looks at Yosha again, "What exactly is your task here Yosha?
She looks down in shame, "I..." She straightens up again, but she is turned away from the others.
"I need a new place to stay on." She turns around and doesn't make a face, "The roof is too small for me and I cannot make it up on the surface. Besides... It is getting a little lonely to just watch you train."
"Wait. Watch us train?"
"You mean you have spied on us?"
"Yes. Since I was too afraid to come here, I watched as master Splinter trained you. That is how I have learned to move so silently."
Splinter looks suspiciously at her, "Where have you learned the technique to use your weapons at the right timing?"
"By my grandfather. My parents was killed when I was recently born, so my grandfather took care of me until I was 4. Then something happened and I had to move to New York. I have lived outside the lair ever since."
Leonardo turns to Splinter, "Well? What do you think master Splinter?"
He thinks for a minute or two before he looks at Yosha again, "Very well. You can stay here. But only on one condition."
They wait for the continuing.
"You have to train as much as the others, and you have to have to promise to never tell anyone about us, unless we are with you and we are talking as well."
"I promise."
"Good. Now, there is some rules here. Most of them, I come up with after my sons little... adventures."
"I am listening."
"On your tasks around the city, Leonardo is your leader. He will tell you what to do, and you will follow his instructions."
Yosha looks Leonardo and he looks back without making any face.
"You are not going up to the surface alone, or without anyone here knows it."
"Understood."
"And the last one is to protect my sons if anything happens to them."
She looks around at every one of the four turtles.
"I promise."
"Well then, go to bed everyone. It is late and it is a new day tomorrow, for new training."
-Awwh...
"Goodnight my sons."
"Goodnight master Splinter", everyone
"There is an empty room upstairs. Leonardo will show you the way."
"Thank you."
She looks at Leonardo which is more suspicious about her than before.
"This way."
He turns around and jumps up to the top floor. Yosha follows.
They come to a large room where it is only a madras in the middle of the room, and a lantern.
"Here is your room."
"Thank you Leonardo."
"Feel like home."
They bow, then he walks away and leaves Yosha standing there alone. Her stone face slightly turns to a sad face. She pulls out a necklace from her coat, and holds it in both of her hands. Then she walks towards the madras and places the necklace carefully on it. Then she starts to cry.