Key
'Fight' - Thoughts
"Fight!" - Speech
"FIGHT!" - Demon

~ BTYB Izuku trying to be macho ~

Izuku's lips curled up into a wicked grin, only confirming the thought that he was a villain to the three people around him. Then, he brought up his knee right into Crawler's junk, causing the man to let the freckled fighter go. Without a second to spare, he punched Crawler in the cheek, forcing him to be knocked into Knuckleduster.

Next, he tackled Pop Step, forcing her into the brick wall that burst on impact, flinging shards of brick into the air. Running off into the street, he kept his head low with a hand holding down his hood while the other flung around in the air. Before long, he was smacked into the ground and felt a foot pushing him further into the firm sidewalk.

"That was for my balls!" Recognizing his attacker as Crawler, Izuku's wicked grin shrunk immediately.

Moving his hands behind his back, Izuku tensed up the muscles in his arms. "And this is for my back," he mumbled as a swift shink was heard and Crawler's legs were scratched on the outer sides. Keeping his claws out, the freckled fighter pushed himself off the ground and threw Crawler off balance until he fell on the ground. Before the hooded vigilante could strike back, Izuku stabbed his claws into each of his arms, watching the crimson blood swirl around each claw and gather around the base of Izuku's knuckles.

Retracting his claws, the slit between his knuckles sealed up and left behind a pale patch of skin. Starting to run again, Izuku didn't look back until he found another alley to go through and he kept snaking around alleys and streets. Only to stumble and crash into a wall.

Turning his back to the wall, Izuku slumped to the ground and closed his eyes with one of his hands covering them. "Hey, human, make sure you watch your own back." He said, feeling the pain in his eyes simmer down. "Watch my own back?" Izuku repeated, his hand falling down to reveal that his eyes were no longer slit.

He stayed against the wall for a few minutes, letting his fatigue diminish. While he sat, he listened for any sign. There wasn't any hint for nearly ten minutes, and by then, Izuku already stood up and started to walk through alleys, following the echoes of villains and heroes.

For the next few minutes, he walked, one hand against the wall and another holding his hood down. Far in front of him, he heard shouts of dramatic attacks and even a few citizens in need of help, though most of them ended rather abruptly. Finding the end of another alley, Izuku stopped and kept close to the wall.

There were a few people walking on the sidewalk, tired and slouching. All of those people had ignored the freckled fighter, allowing him to walk among them while he searched for another route.

"I found him!"

Kicking down to the ground, he found the succubus woman had found him this time, though she held down his head and arm instead of standing on him as Crawler had done. With the arm she wasn't holding, he pushed himself off the ground and managed to throw her off balance with the sudden burst of strength.

Once he was free, he ran off again with his head facing the ground. Fleeing into an alley, he made sure to knock down a trash can and a few bags left lying around so there would be obstacles for anyone who followed the trail. Though he didn't check if anyone followed him, instead, he kept running until he made it into the downtown area, where more heroes and villains would be.

Yet when he was there, it seemed all the fights had settled down. There was no overdramatic shouts, only casual chatter among those walking along the sidewalk and the side of automobiles. Taking this chance to catch his breath, Izuku walked among a small crowd, hoping that would hide his presence for the time being.

'Those guys were strong and without my demon genes, they'd certainly have sent me to jail.' He thought to himself, expecting some of Shiori's input, though she still had yet to answer him at all. 'But after I ate that lizard-man's soul, I remembered each moment I spent during stage 2. That must mean my demon genes are growing stronger, especially since I have that woman's claws. Though I don't remember her claws absorbing blood to heal her hands.'

Taking a quick glance at his hands, Izuku saw the pale patch of skin between his centermost knuckles. He wanted to look into the newfound ability as soon as he could, but he decided to stuff his hands in his pockets instead.

Still walking, he heard a scream, echoing through the night. Turning to his left, he broke into a sprint toward the source of the deafening screech. Pushing a few people out of his way, he narrowly jumped over a car before he was grabbed by a tough yet thin material that wrapped around his arms, legs, and even his horns.

"Kid, sit still." A gruff voice ordered in a lazy tone. Knowing he wouldn't be able to escape this trap, Izuku stopped pushing forward and turned toward the man who captured him.

Standing on top of a lamppost, a man in all black held onto a dull grey scarf that wrapped around his neck several times. Covered by that scarf was stubble and black hair that reached to the man's neck. Taking a moment to take in all the details, Izuku's eyes bolted wider upon realizing who it was.

"Eraser Head." He muttered, looking at the man who eyed him as a hawk would to its prey.

"Let the heroes handle this," the underground hero replied, throwing his scarf to swing up to the top of a building.

'Eraser Head is just like other underground heroes. Serious about their job and antisocial.' The freckled boy thought, watching the man swing away. 'But he's not stopping me.'

Starting to run again, Izuku tried to follow the path that Eraser Head took, though the man was too fast for the demon vessel, so he lost the man's trail. Nevertheless, he kept looking for the source of the screech, though there weren't any more screams.

Sighing, he started to head back home with his hood still covering his horns. It wasn't long before he was sucked into his own thoughts, reflecting on the latest events. 'Eraser Head works at night and can stop me in the blink of an eye. I'll have to stay away from him, though I might be able to cut off the capture tape he uses with my new claws. Now, how do I use those claws?'

"I found a new toy!"

A knife pierced Izuku's arm while a girl jumped on top of him, sitting on his abs with a knife in her hand. The girl had a messy blonde bun on either side of her head while she adorned a slightly torn up and bloody school uniform.

Around him, every single person had either ran away, called for help, or started to record the situation on their phone. Trying to defend himself, Izuku tried to grab the girl by her arms, only to have a hand stabbed into each of his hands. Screaming to any hero that could hear him, he was stabbed in the arms two times.

"You're fun to play with!" The blonde girl laughed maniacally, pulling out two more knives from her sweater. "I wonder how long you'll last!" She shouted, impaling yet another blade into Izuku's body, this time, she aimed for his left shoulder.

Screaming in agony, Izuku closed his eyes and heard the shink sound again. Now, from between his knuckles, there were two bloodied bones sharped along the inner edge, especially at the very tip. With his right arm, he tried to swipe at the blonde maniac, only for her to grab the knife that was embedded into his arm and use it to push him onto the ground again.

"You're a feisty one! I like that!" She squealed, leaning closer to Izuku's face, though he kept his eyes closed. "Come on! I want to see you all bloody!"

'Why do I feel... lightheaded?' Izuku thought, watching as the knives jammed into his hand were pushed out and replaced with a pale patch of skin. 'I have to do this quickly!' He shouted at himself, figuring out his new weakness.

Waiting for the next pair of knives to be pushed out, Izuku headbutted the crazed girl with his horns. Then, he stabbed her in the left shoulder and shoved her off of him, followed by two knives crashing onto the ground. Getting up, he had to use his claw like a cane after he took his other claw out of the girl's shoulder.

Gazing over the crowd that had built up around the scene, Izuku grit his teeth and charged at his attacker while she got up from the ground. But before he could stab her again, she tackled his waist and kept laughing to herself.

"This is fun!" She shouted again, pulling another pair of knives out of her sweater. Bringing the blades down on Izuku, she pierced his chest, right under his shoulder blades. "I got you now!"

"And I got you," he huffed out, his arms stretched out in front of him. When she looked down, Izuku's bone-claws were piercing through her abdomen with her blood being sucked out by the blades. With the blood crawling into Izuku's body, his lightheadedness had remained, but the other knives that the girl had shoved into his body were pushed out.

"Ah!" She screeched pulling herself away from the freckled vampire and removing his claws from her body in the process. "I'll... We'll have more fun later!" She shouted, running away into an alley.

Sheathing his claws into his arms, Izuku wasn't helped up or even asked if he was okay, so he had to get up on his own. Standing in the middle of the crowd, he pulled his hood over his horns and ran away, stumbling a few times along the way. By the time he was out of the crowd, people were already posting the video of his fight, not that he had time to think about it.

~ Time Skip ~~ BTYB Izuku passing out on his bed ~

 "AH!" Izuku shouted, falling onto his behind. Grabbing onto the rim of the bathroom sink, he slowly peaked over and looked at himself in the mirror. In his reflection, there wasn't anything different about his horns. But his eyes held a different problem. Instead of being surrounded by white, each of his irises was surrounded by pitch black.

He rubbed his eyelids, hoping that would fix the issue. When his eyes had remained unchanged, he started to pinch himself. Still, nothing had changed. Even splashing his face with water yielded no results.

"Shiori? Are you there?" He asked, but she had yet to appear. Instead, his reflection had changed. The eyes of his reflection became slit and its mouth had fallen into a scowl.

"Human, you just killed a snake-man in an abyss and you freak out when you look in your reflection." The reflection spoke to the other side of him.

"How do I change back?" Izuku frantically asked his reflection. "I can't stay like this!"

"Rude." He commented, watching the real Izuku panic around the bathroom. "Close your eyes and focus on the human side of you." He informed.

"The human part of me?" Izuku repeated, tilting his head slightly.

"Think about your happy place. You know, imagining yourself as the number one hero." The reflection joked, causing Izuku to sigh.

Nonetheless, he followed the reflection's orders. Closing his eyes, he thought of what had made him happy and there were few things that would do that. The first was becoming an actual hero with a legal license too.

When he opened his eyes, the sclera was white again, allowing Izuku to sigh in relief. "See, not that hard." The reflection commented once more.

"Thank you," Izuku muttered to the reflection before raising his head with his head tilted again. "Wait... how are talking to me?"

"Would you believe me if I told you this was all a hallucination?"

"No... not really," he answered, causing the reflection to smirk. "Shiori always appeared in my reflections. Actually, where is she?"

"She's probably napping again. Combining souls tuckers a demon out, even one of her rank." The reflection answered, before returning to the previous question. "And since your genes are settling inside your body, I, your demon side, can speak to you, your human side. Well, until we combine, but we'd have to consume a few dozen souls to do that."

"Thank you," Izuku muttered again, washing his face again. "I... I have to get ready for school."

"Yeah, I know." The reflection replied to the other side. "Just don't rely on me too much. It'll speed up the combining and then you'll be on your own."

"Right," Izuku nodded, turning on the showerhead.

~ BTYB Shiori Napping ~