This is an AU My Hero Academia story in where Izuku is kidnapped and experimented on. I do not own the My Hero Academia franchise as it along with all of their characters belong to their creator Kohei Horikoshi. Warnings both Bakugo and Izuku may be a little OOC (out of character) so please don't hate. Please be sure to leave me your comments and reviews telling me what you think.

Key Guide: "regular speech", 'thinking', *mental telepathy*, italics - attacks & special abilities, bold - demon/nomu speech

Reunited

Bakugo tried to frantically wipe the tears away from his eyes. Aizawa has been watching and listening. Aizawa took the chance to look over the file. Included was a photo, extensive information or what they have done to the child, and what information they had about the child.

"I take it that you recognize this demon." Aizawa stated as he gave Katsuki a handkerchief. Bakugo dried his eyes.

"There is certain things about him that reminds me of a childhood friend. He was the only one who called me Kacchan since he had trouble saying my name." responded Bakugo. He watched the demon tilted his head curiosity. 'He has the same tic that Izuku had when it came to studying or when he was confused.' Bakugo thought to himself.

"Bakugo come here and take a look at this." Aizawa stated. Bakugo walked over towards his teacher to see an open folder on the table. In it laid a picture of Izuku. Shock stretched across Bakugo's face. He quickly turned back to the demon in the other room as he he ran up to the glass pounding his hands against the glass. Sparks of his quirk erupted from his hands.

"What the hell happened to you damn Deku?" he asked angerly.

"I take it that you recognize the boy in the picture." Bakugo nodded his head.

"I am not the only one. The detective would recognize that picture as well." stated Bakugo.

"Tell me more about your friend. What was his quirk?" Bakugo went over as he took a seat across from his teacher.

"As far as I know, Deku had yet to develop his quirk. He was taken the day that he was supposed to go to the doctors to find out about his quirk."

"Deku? Doesn't that mean useless?"

"The bullies in the past called him this because he was late in showing any signs of a quirk. Izuku Midoriya and I were childhood best friends as his mother and my mother were also childhood best friends as well. Izuku had a very sharp mind as he was able to analyze a person's quirk. Determining its strengths and weaknesses." Bakugo stated as he opened up his backpack pulling out a composition book. He opened it up to reveal in depth information about Aizawa. Aizawa's eyes widened considerably when he read the in depth infomation.

"What of his family?" Aizawa asked. Bakugo could only shake his head.

"Izuku's father left when he was just a baby. His mother committed suicide when the first victims turned up. She feared that Izuku had meet the same fate." Aizawa closed the book letting out a soft sigh.

"Poor child. It seems that he's had it tough from the very beginning. It's a miracle that he managed to survive after everything." stated Aizawa.

"Sensei do you think that I can actually take to him?" Bakugo asked.

"It might help. We have to see it he is able to remember anything from his past." The two walked into the adjoining room as Aizawa opened the door. "Subject 101... I brought someone to see you." Bakugo stepped out from behind his teacher. The demon's head tilted to the side.

"Kacchan?" the demon questioned.

"Long time no see Deku. It has been thirteen long years." stated Bakugo. The demon walked up to Katsuki. He took Bakugo's face into his hands examining it. Katsuki allowed the demon to do as he wished. A small smile stretched across the demon's face showing his fangs.

"Kacchan."

"Yeah it's me Izu." replied Bakugo as he pulled out one of the composition book. "Do you remember this?" he asked holding out the book. The demon took the book from Bakugo as he brought it over to the table. His long claws traced over the letters on the cover. He opened up the book to the page containing information about Aizawa.

"Eraser?" he questioned pointing to the page. Aizawa nodded his head, the demon then flipped to another page that contained information about Bakugo. 'This person seems familiar. Could it be the boy I seem to remember? I feel this strong connection to him.' The demon stared at the name on the page as it read: Katsuki Bakugo codename Ground Zero. "Katsuki... Bakugo... Ground Zero..." Bakugo nodded his head.

"You helped me come up with that hero name when we were kids. You even helped me with my training and designing my hero costume." stated Bakugo.

Memories of the past came flooding back of a time when the demon was still a human being. The blonde boy before him had just developed his quirk which happened to be explosions.

"That's great Kacchan. You have such a strong and powerful quirk." a green haired boy exclaimed.

"I will become a great hero just like All Might. Will you help me in the meantime until your quirk develops Izuku?" asked Kacchan. Izuku smiled as he nodded his head.

"Of course I will Kacchan. I even have the perfect hero name for you."

"Really?"

"Yeah it is Ground Zero."

'Ground Zero?"

"Yeah think about it. Since you are the source of the explosions which will make you ground zero."

"That makes perfect sense. I kind of like it. If I become a hero I will use it as my codename. Thanks Izuku."

The memories of the demon's past faded as he took a long hard look at Bakugo. A small soft smile stretched across his face.

"The memories are a bit hazy at the moment. I somewhat remember. What will happen to me now?"

"According to Bakugo, you have no family left. So, I have decided that you will stay with me. Once you have been rehabilitated, I plan to enroll you into the hero course." stated Aizawa.

"That's great Deku. You will still achieve the demon we both had as children. To become the best and strongest heroes around." The demon began to recall the promise he made with Bakugo.

"To protect everyone regardless if they are strong or weak, hero or a villain, an enemy or an ally, We should give hope to everyone while we protect those we cherish and love. This should be the goal of those whom desire to become pro-heroes." the demon stated as the words seemed to slip from his mouth. This caused Aizawa to smile.

"I guess you should get used to your name once again, Izuku Midoriya. Bakugo you will help me with his rehabilitation."

"Of course Mr. Aizawa."