Dragon Fighter and Chief Second in Command

Dragon Fighter and Chief Second in Command is about two six year old sisters, not twins, Kathy and Beatrice. Kathy is the girliest girl in the whole kindergarten, and Beatrice, who prefers to be called Dragon Fighter, is a HUGE tomboy. 
They are playing in the basement together, (which doesn't work that great) Beatrice is being a dragon fighter in their game, and Kathy is being the princess in the game. Beatrice pauses the game and starts a talk with Kathy."Why do you have to be so girly?" she asks putting down her cardboard sword.
"Why do you have to be so boyly?" Kathy replies, still admiring herself in the vanity mirror and pretending to put on makeup. Beatrice rolls her eyes. 
"You know what? I am going to make you a tomboy," says Beatrice putting her hands on her hips. Kathy sighs. 
"You can try," says Kathy, putting down her hairbrush and turning towards Beatrice.
"I must teach you first, about dragon fighting." 
"Okay."
From then on, Beatrice is called Dragon Fighter and Kathy is called Chief Second in Command. Kathy is now a complete tomboy, before Beatrice told her about tomboying, if Kathy got one mark on one of her dresses, she would cry. Now, she rolls around in the mud and wears random T-shirts and worn jeans. One day, Dragon Fighter is looking for a dragon to mail to the police to arrest. And they find one, well, it doesn't look like one. They find a red-eyed bunny and rip out some of Dragon Fighter's long black hair to tie it up with, while they tie it up, the bunny bites Dragon Fighter and she screams, the wound starts to blister immediately. They hide it from their mom and wrap it up with toilet paper. They still mail the bunny to the police with a messy note. The next night, they have to go to the hospital super bad, and while they are walking to the car, Kathy trips over a rock and breaks her ankle. Their parents head to hospital as quickly as they can. The next week they go back to school and the police has sent back the bunny in a cage, it sat there, staring at everyone in the classroom, it looks like it's waiting, just waiting. They go threw the day fine, but, the bunny, they find out it really is a dragon, in disguise. It is waiting for the right time to show itself, and kill everyone in the whole United States. How will Dragon Fighter and Chief Second in Command save the whole United States in their conditions?