DISCLAIMER: DON'T OWN ANY CHARACTER, EXCEPT FOR MALI. SHE IS MINE. '

WARNING: THIS CHAPTER FEATURES SLIGHT GORE AND MENTIONS MENTAL ILLNESS. HENCE THE NAME OF THE CHAPTER.

A couple of months had passed when Mona Lisa was introduced and taken in by the family of turtle brothers and their father rat. She followed their rules to a "t" and never faltered. Mona Lisa didn't think that anything could bring her down. Still, Mona Lisa still, at times, was not able to fully adjust to life outside of StockGen.

Donatello told the brothers that Mona Lisa was probably suffering from PTSD and quite possibly Bi-Polar disorder, stemming from the abuse and neglect she endured while in StockGen. Donnie also warned them of the symptoms and they weren't pretty.

Because of her condition, she would go through violent and aggressive episodes and at times hurt the turtles; one time she left a huge gash on Leonardo's arm and another time, she had Raphael in a chokehold, and didn't let go until he was passed out. After every episode, Mona would seek refuge in the tunnels, ashamed and horrified at she had done, and every time, Donatello, the genius of the group, would come and find her and bring her back to the lair. But before that, they would walk the tunnels, trying to wash away the day's events from her mind.

Walking in the tunnels of the underground of NYC had become a pastime of Mona's. It gave her solace and solitude and gave her time to think. However, on this particular day, Mona wasn't feeling quite like herself. She was flushed and her eyes were wide, as though some unseen force was affecting her, more so than usual.

Donnie, as always, went looking for her and spotted her in a niche in the wall. Walking up to her cautiously, he kneeled in front of her.

"Lissey, are you ok?" Donnie went to put his hand on her head, but Mona snapped her head up and she shoved Donnie against the wall, her forearm digging into his throat, and his calls her help had his brothers coming, but it would be some time. Donnie had to think fast.

"Lissey, it's me. It's Donnie." The moment the words came out of his mouth, Mona Lisa let go of Donnie and looked at him, absolutely in horror.

"Oh my God, Donnie, please forgive me. I'm… I gotta go." Mona Lisa then sprinted off in a run, further and further into the tunnels, trying to desperately find a place to hide.

"Mona Lisa…" A voice sounded out, calling her name. But it didn't sound like Donnie's. No, it didn't sound like Donnie's at all. Actually, it didn't sound like any of the boys. It sounded out again.

"Mona Lisa… Where are you?"

Mona Lisa ran to to sound of the voice, hearing it more clearly as she ran. Mother.

"Mona Lisa? Where are you?" Mona Lisa heard her mother's voice call out again, and as she turned the corner, there she was. A tall jaguar mutant with bright blue eyes. She had human hair, black and set in a long braid. Wearing a white maxi gown, the mutant Mona Lisa had called Mother, but her true name was Mali, was standing there, right there in front of her eyes.

"Mother! I'm right here!" Mona Lisa called out to Mali, but she didn't hear her. Mona Lisa grew frantic. She tried to run closer and closer to her mother, but the closer she got, the further away Mali seemed to get. Then, something happened. Mali looked straight at her.

"Mona Lisa?" Mona Lisa stopped and was about to rush towards her, until she heard another, more familiar voice.

"Too late, bitch." Mona Lisa stood in horror as her mother's body was deconstructed in front of her eyes, and the owner of the second voice came into view. It was Hobb. Hobb killed her mother. No. It can't be. He wouldn't do that. She started toward them, but all of a sudden, the images of Hobb and the remnants of her dead mother started to fade and Mona Lisa ran and ran towards them, wanting desperately to gash out Hobb. And then, they were gone and Mona Lisa was left standing in front of a wall, with the distinct markings of blood and hair. Kneeling down, she saw a ring in a puddle. It was the same ring her mother wore.

Tears came to her eyes and she screamed out in agony as the realization of what she saw a few moments before became too much to bear. Continually screaming, Mona Lisa never felt Donatello come up behind her, she never felt him hug her.

Donnie continued to rock her, attempting to soothe her, but to no avail. She continued to hyperventilate as she cried and screamed and it broke him to see her like this. He needed to do something, and then, an idea popped into his head.

Tilting her head towards him, Donnie laid his lips upon hers. Shock came over Mona Lisa as she felt Donnie… KISSING her. But, as soon as the shock wore off, relief settled in and she kissed him back slightly. Parting from her, Donnie looked into her eyes, asking her if she was ok. Mona Lisa sighed and looked down.

"I saw my mother and how she died. Hobb killed her. He deconstructed her. I will never forgive him." Mona Lisa dug her head into the crook of his neck, and Donnie patted her head and rocked her until she fell asleep. Picking her up, he walked through the tunnels, until he was met by his brothers halfway. Leonardo noticed Mona in Donnie's arms and arched his brow.

"I'll give you the gist of it when we get back. Right now, I just want to get her back to the lair."

The brothers all nodded, and started back towards the lair. Raphael stayed with Donnie, and looked over to him.

"You look flushed." Donatello smiled slightly, remembering his kiss with Mona, even though it happened for the wrong reason.

"Ah, it's nothing. Do you mind watching over her when we get to the lair? She told me something that I wanna to some research on."

Raphael nodded, and as they entered the lair, Splinter noticed Mona in Donnie's arms as well, but didn't question it. Raphael took Mona from Donnie and brought her to his room. Laying her in his bed and putting the comforters around her, Raphael went to leave, but was soon pulled back by a sleepy Mona.

"Please don't leave me, Raphael." Raphael smiled and laid in the bed with her.

"Never would dream of it Buttercup." Mona smiled and fell back asleep. Raphael soon fell asleep as well, but not before wondering what exactly happened to her in the tunnels. He, his brothers, and Splinter would soon find out.