The Ninja Turtles jumped from building to building under the night sky, light rain falling as they held a vial of a strange substance stolen from a Krang base. They were still panting from the effort of their recent escape when a ruthless Foot Clan ninja appeared in their path. Her hooded and agile figure emerged from the shadows, ready to eliminate the brothers as she had tried so many times before.

Leonardo unsheathed his Ninjatōs, while Raphael, Donatello and Michelangelo wielded their weapons. The fight began fiercely. The ninja moved with speed and precision, dodging the brothers' attacks while throwing her own lethal blows. She kicked Donatello, sending him reeling. The vial she held in her hands flew through the air and landed on Leonardo, covering him with the strange substance.

Raphael, Donatello, and Michelangelo stopped abruptly, alarmed by what had just happened. Leonardo blinked, wiping his face, but something had changed. His blue eyes, which always showed focus and determination, now had a disturbing gleam. There was something unhinged in his gaze, a mix of obsession and desire that hadn't been there before.

Leonardo began to chase her with a disturbing intensity. His movements were no longer calculated as usual, but erratic and desperate. Finally, in an unfortunate move, she tripped and fell to the ground. Leonardo was already on top of her, holding her tightly.

Leonardo: "You can't run away from me... I love you... I need you..."

The ninja struggled desperately under Leonardo's weight, terrified by the turn of events.

Raphael: "Leo, what are you doing?!"

Donatello: "It's the substance! It's affected his mind."

Leonardo seemed to have lost all control. His only thought was her.