The Legend of Ben 10: Book 1, Sentience.

Chapter 4: The Chase

Ben narrowed his eyes at Azula. "What are you going to do? What is it you exactly want from me?"

Azula shrugged. "Honestly I think I've told you everything. I want you as part of my task force, loyal to me. In return, you get to help me reunite this world under the hands of a humanitarian cause. The Ladies came to this world because it was starving under the rule of the Avatar. He and the Spirits were the real invading force. Think about it. Why is there a spirit world now? That was not originally a part of this planet.  The Ladies work with the Plumbers, they are what's left of it. You know the Plumbers right? The intergalactic Police, they still exist.  Mia's father was a Plumber too."

Ben gritted his teeth. "I see. So you intend to lie to me so you can use me huh?"

"Whatever do you mean?" Azula said. 

"I've traveled with the Avatar's friends, you can't pretend who they are, what they are." Ben exclaimed. 

"They were lied to too. Avatar Aang brainwashed them, it's why I haven't killed them. I will show them mercy and allow them to live their lives. It is Aang who wishes to use them." said Azula. "See..?"

Azula gestured a hand to show several Soldiers holding Toph between them. Her wrists and legs were bound in what appeared to be platinum cuffs. 

The cuffs were undone and the soldiers stepped away from the surprised girl as Azula smiled in a seemingly benevolent way. 

"You see? No harm." said Azula. 

"Don't listen to her Ben!!" Toph yelled. "Azula's cunning! She's trying to manipulate you!"

"Oh please, look at these two members of my task force, they couldn't be happier." said Azula.

"It's true." said Mia. "Me and Chris have been here for a while M-Mr. Ben 10 sir! she saved our lives! I don't know what the trouble is with this Toph person, but-."

"We trust Azula completely. She's our captain. We've seen her give food to the poor and save villages from the tyranny of the rebels under Fire Lord Zuko ourselves." said Chris. "Please, er Ben 10 sir. We could use a hero like you to help us. Help the Matriarch save the Earth."

But Ben was shaking his head. "I've seen the girls you captured, can you explain that?"

Azula sighed. "Those girls were infected with a rare type of disease that we've been trying to deal with. Unfortunately it is highly contagious, so the Ladies can't risk touching them directly. So other methods are utilized in taking and treating them. Many have misunderstood-."

"You really expect me to believe that instantly!?"

Azula smiled, and for the first time Ben felt that she was showing a genuine expression of smiling.  Her cheeks turned pink. "Well, at least believe the fact that we have plenty in common. You and I have much in common. We're both warriors, we're both fighters, and we're both meant to guide this world into tomorrow.  And I'd like to have you at my side. Trust me when I say, I've never seen another person in the same way as I see you. You're genuinely confounding."

Azula took Ben's hand in her own gentle grasp. "I'm sure you understand how I feel."

Ben just stared, feeling shock course through him. "Azula..?"

Toph just puffed up her cheeks, trying not to vomit. "Y-you've GOT to be kidding me."

"BEN!" Katara's voice shrieked into Ben's coms through the Omnitrix. "The Girls.. the Girls are all just bodies for them. The Ladies are laying their eggs in the girls and killing them so that the bodies can be their children's bodies! That's what they're doing!"