A Siblings Promise (Katsuki Bakugo's adopted sister)(DISCONTINUED)

4:Thank You

Chapter dedicated to Shouko-narumi thank you for being a huge supporter of this book. Enjoy

Flashbacks in this chappy

"ITS A VILLAIN"

"QUICK! GET OFF THE STREETS!"

Citizens screamed as they dashed and scurried away from Tabbo plaza, trying to avoid the sludge like Villian that ran rampage in the market. A total of 4 pro heros where on the scene,along with several police officers. And news teams. A small crowd had also formed, obviously interested by the event that has begun to unfold.

There was nothing the hero,or the police could do. At first,Death Arms thought he could just reach in a grab Katsuki and (Y/N),and pull them out,but that ended badly,with the sludge beginning to try and consume the hero. Two more heros,BackDraft,and Kamui Woods couldn't do much either. Backdraft was busy trying to contain the fires that Katsuki's quirk created,and Kamui Woods,well, since he was practically made of wood,he couldn't do much, except help keep the citizens back,and help any that were trapped. Finally,the newest pro,Mt.Lady,was useless. She was in the gigantic size,but due to this,she couldn't fit down the one lane street.

'Man,these Pro's are useless' Katsuki thought. 'If this extra didn't have control of my quirk,then I could have gotten me and (Y/N) free already.' Suddenly,panic struck,as Katsuki realized that his sister was trapped INSIDE the Villians sludge like body. Out of panic,he began to wiggle his arm,to find that he could easily move it. With a smirk on his face,he begins to reach around for his reptile sister.

After several hours of searching,his fingers finally brushed against the fabric of a hoodie,which was the last thing (Y/N) was wearing when the Villian struck.∆ With a small cheer, Katsuki began to pull forward, hoping to drag (Y/N) out of the sludge. His struggling went unnoticed by the Villian,but Death Arms noticed. Rushing in again,he pludged his arms into the sludge,grasping something,before beginning to pull.

The thing he had grasped was (Y/N)'s horns,for as soon as her face was out of the sludge,her eyes open,and a roar left her lips. Using her dragon like strength,she pulled herself out of the sludge,her eyes no longer the (e/c) color Katsuki knew. They were now Ice blue,A color Katsuki became familiar with two years ago. 'Savage mode' he thought.

He watched as (Y/N) stood up,her tail swishing back and forth,her wings out, stretched in intimidation.  He knew he had to snap her out of it,or risk her causing more damage. He opened his mouth, noticing the sludge beginning to creep towards it. Taking a deep breathe,he pushed forward.

"SNAP OUT OF IT,SIS!"

As soon as those words left Katsuki's mouth,(Y/N)'s figure staggered. Shaking her head,she turned. Katsuki sighed in relief,for the trick worked,for her eyes were back to normal. But the relief was short lived,as Katsuki watched as (Y/N)'s neutral face,turned into one of horror.

"K..ka...Katsuki!" She stuttered. Her body was shaking,for her brother was trapped,all because he had saved her. Well now it's her turn to save him. Crystalizing her wings,she pulled out two large crystals,before reverting the wings back to normal. Stretching them out,she pushed herself off,using her wings to propell herself forward. Death Arms was in shock,as he began charging forward,hoping to stop the reptile girls actions,bit (Y/N) was faster. Swinging her Crystals,she made contact, ripping at the sludge Villians skin.

He wailed in pain, before lunging at the girl,who quickly dodged and surged forward again,cutting more and more into the Villian."GIVE ME BACK MY BROTHER,YOU WASTE OF SPACE!" (Y/N) yelled, continuing her attack. The Villian grew fed up with the reptile-girl's antics,for he unleashed a ruthless attack, striking at the building closest to his opponent.