Author Note: So after quite a bit of thought I decided this story would be better if I started with some more build up on Izuku and Bill's relationship. Don't worry the cave arc will turn up again in a little few chapters.
Please let me know what you think.
Izuku felt like something was wrong. It was a strange itching sort feeling as if someone had shoved sand underneath his skin. Not only that but he had woken up with a painful headache. Logically he knew both were probably a product of the slime villain trying to take over his body yesterday, but that explanation didn't sit right with him.
"Are you okay?"
Izuku looked up to see his Mom staring at him, green eyes bright and brows furrowed. He hadn't told her about the slime villain because he didn't want her to worry. There had been no media present and All Might had never taken his name so there was really no reason she would ever hear about it.
"Yeah," he said. "I just didn't sleep well."
That was mostly true. That odd dream he had last night stuck in his head making it hard to go back to sleep. A product of his wishful thinking he supposed. Now that he had been told by the number one hero that there was no way he could become one he should really learn to let go.
By the time he arrived at school his headache was almost blinding in its intensity. The medicine he had taken in an attempt to get rid of it wasn't doing anything.
As school went on he found it harder and harder to focus on what the teacher was saying. Fortunately his teachers had never really cared what he was doing as long as Izuku didn't disrupt the class or do anything disrespectful. He was tempted to ask to go to the infirmary to rest, but he didn't want to draw any more attention to himself after yesterday. Izuku gritted his teeth and did his best to fight through the pain.
The migraine continued until about halfway through the school day then, with a feeling similar to a bolt sliding into place, it abruptly cut off. Izuku blinked in surprise.
That was odd, He thought.
"Eh, not really," A familiar high pitched voice responded. "It takes some time to move into a new head, you know? Anyway yours is pretty cluttered."
Izuku let out a yelp and shot up out of his chair. The class went dead silent and everybody stared at him. Izuku quickly sat back down, a flush creeping up from his neck all the way to his ears. He covered his face with his arms.
The class burst out laughing and the teacher glared at him.
"If you are going to zone out please do it on your own time Midoriya," The teacher said impatiently.
"Yes, sir," Izuku responded.
He sunk low into his chair and stared at the ground as the lesson continued.
Was he going crazy? No one else seemed to have heard the voice.
"Don't worry you're not going crazy."
Izuku went stiff in his chair. The teacher shot him a disparaging look.
"I mean anyone who makes a deal with me has to be at least a little crazy," The voice continued. "But hey! At least you're not imagining things."
Izuku covertly glanced around him. No one seemed to have noticed anything. He opened his mouth to respond. The bell went off. Izuku bolted out of the classroom and up the stairs to the roof. He slammed the door shut behind him and leaned against the fencing.
"Who are you?" He asked the empty air.
Was this some sort of strange new quirk? Was one of his classmates messing with him… or perhaps a new student at the school trying to prove themselves by playing a prank on the Quirkless kid?
"Calm down kid. It's just me, Bill! You made a deal with me last night, remember?"
Izuku flinched at the voice. It was the triangle from his dream. That had actually happened. The feeling of wrongness reasserted itself.
"What do you want?" Izuku asked, hands clenching into the cloth of his jacket.
"Yeesh you're a suspicious one. You agreed to let me into your head so here I am. Of course I'm able to talk to you. How else would an incorporeal being like myself teach you?"
Right he had agreed to that… What had he been thinking? Izuku sat down with his back against the fence surrounding the rooftop.
"So how is this going to work?"
"Well I hang out in your head. Take a little of your energy at a time and eventually…."
"I mean you teaching me to become a hero," Izuku interrupted.
"Oh that!"
The triangle hummed.
"It'll be simple. I'll send you on little quests to find useful things and then I'll teach you how they work as well as some other stuff… easy as stab in the eye with a sharp stick!"
"I don't think that's the way the saying goes," Izuku said.
It did sound pretty simple though. He grimaced. In his general experience the simpler something sounded the harder it tended to be.
"So how long will you be in my head?"
"Eh…. Just until I get enough energy back."
That was vague.
"But how long will that take? What exactly is 'enough' and how will it affect me?"
Izuku never got his answer because just then the door to the roof slammed open. Bakugou emerged an annoyed expression on his face. When he noticed Izuku his expression shifted to a malicious smirk.
"Oh there you are Deku," He said sauntering over to him.
Izuku cowered against the fence behind him, limbs shaking.
"What was up with that screaming in class today?" Bakugou asked. "See your own shadow or something?"
Izuku tried to reply but couldn't so he gave Bakugou a watery smile hoping the boy would leave him alone. Unfortunately it seemed to annoy him instead.
"What are you smiling about?"
Bakugou slammed his right hand into the fence above Izuku's head releasing a small explosion. Izuku fought back a whimper, a memory of what that felt like against skin fresh in his mind.
"Cool ability. So are you meatsacks gunna fight?"
"Why would I do that?" Izuku asked, caught off guard.
"Are you talking back to me, runt?" Bakugou snarled.
"N-No," Izuku sputtered. "I was just talking to myself."
Bakugou's lips curved into a mocking sneer.
"I guess you would talk to yourself. You're the only one who would listen after all."
The sneer disappeared of off Bakugou's face and he watched Izuku through half closed eyes.
"Listen, I'm not certain you got what I was saying yesterday. From what I've heard you haven't removed UA from your application list yet."
Izuku shook his head, eying Bakugou's hands warily. Bakugou leaned back and crossed his arms.
"Since I'm feeling generous today I'm going to give you one more chance…"
He examined his fingernails thoughtfully.
"Remove UA from your list and I'll ignore you this year. I'm going to be busy preparing for my future at UA so I won't have time to waste on a useless Deku like you. If I find out that you've applied though…"
He paused and a series of explosions went off in his hands.
"I will make your life a living hell. Got it?"
Izuku nodded automatically, eyes wide.
"Good," Bakugou said, giving him a mocking pat on the shoulder.
Izuku flinched, but Bakugou was already walking back toward the door. He waited until the other boy disappeared off the roof before he went limp.
Bill gave an impressed whistle.
"Wow, he'd fit right in with the henchmaniacs!"
Izuku stared at his shaking hands.
"Bill?" He asked.
"Yes Broccoli Head?"
"How soon can I start learning magic?"
He felt tears trickling down his face. He was terrified, but something had to change. He couldn't go on like this. He was tired of being useless. He wanted to be worth something. He wanted to be a hero. Maybe then he wouldn't feel so broken. He might not trust Bill, but the triangle was his only chance.
A foreign feeling of amusement drifted through his head.
"How about we start right now?"
