[Request from Archive of Our Own]

EDITED

Reader's quirk

With the help of the demons inside a weapon passed down by your bloodline, you can control darkness.

Drawback

You have to conquer the demon inside the weapon to be able to be fully control of your quirk and to wield a different weapon. If you fail to do so, the demon will take over and kill everything in sight and may only be stopped until you fight it and take over.

For short it's like an Owari no Seraph thing

You stared in the mirror in fear of yourself. Tears slowly ran down your cheek as you remembered what happened earlier during training which made you run off to your dorm room.

"(L/n) and Kirishima. Take your places and train. Next, Uraraka and-" Aizawa trailed off as Kirishima walked over to you with a grin

"Let's go all out!" Kirishima said, you nervously nodded and followed after the cheerful male. Once you were far enough, you both halted. Kirishima turned around to face you with a curious look on his face

"Since you just transferred to this class this year, I'll tell you about my quirk!" He lifted an arm and activated his quirk

"I'm able to harden any part of my body! How about yours?" Kirishima grinned at you as he deactivated his quirk. You rubbed one hand up your arm

"Darkness Wielding, I can summon weapons and they let me control darkness" You muttered

"That's really a really manly quirk! I can't wait to spar with you!" He took a fighting stance and activated his quirk and began to rush towards you

"W-Wait!" Out of reflex, you summoned your scythe and used it to hit him back

"I can't control my quirk!" Kirishima's eyes widened. This girl he admired that who rose from class 3-C can't control her quirk? Was that why she has been in class C for so long?

Kirishima regretted it as he saw the fear in your neon green and (e/c) eyes-

"Neon green?" Kirishima used his quirk to defend himself as you swung again, you suddenly screamed and held your head for a minute before stopping. Kirishima stared at your standing form, ready to activate his quirk.

You suddenly lifted your head and he gritted his teeth. Your eyes were neon green, a crazy grin was on your lips as you reached for your scythe and charged at him while maniacally laughing.

"(L/n)!" Kirishima crossed his arms in front of him as he activated his quirk. He couldn't do anything but defend himself.

'I can't risk calling others for help!' Kirishima continued to dodge and defend, suddenly he was thrown back making him grunt in pain.

Just as he opened his eyes to stand again, you were already charging at him with your scythe transforming into a sword. He was about to use his quirk again when you suddenly stopped. Your eyes went back to (e/c) and the sword in your hands disappeared.

You stared horrified at Kirishima's beaten up form and the destroyed surroundings.

"I did this...It's the same when my quirk first activated" Tears quickly rolled down your cheeks and to the ground beneath you. You grit your teeth and clenched your fists

"How can I be a hero..." You lifted up your face to see Kirishima already standing up

"When I keep hurting others?" Just as he was about to reply, you bolted off to the direction of the dorms

"(L/n)-" Kirishima hesitated before shaking his head and unknowingly followed you to the dorms without your knowledge

"(L/n)?" Kirishima knocked on your door, he twisted the knob and hear you sniffling. His heart broke as he stood at the door and watched you cry.

He frowned and shut the door before walking to your side. You paused and turned to the red haired male beside you

"W-why are you here? I'm a monster" You told him, tears continued to fall down your cheeks as you tried pushing the frowning male out of your room. He slowly lifted his arms and wrapped them around you before pulling you into a hug.

More tears gathered in your eyes as he held you in his arms

"I-I want to be a hero...!" You lifted your arms and clenched the fabric of his tank top

"I don't want to hurt people!" You continued. He let you cry a bit more before he began to move his right hand to comfort you.

Feeling a bit more confident, he grabbed your arms and placed his forehead on yours

"You're going to be a hero." He grinned

"The reason why we are all here is to learn how to control our quirks and use them to save people!" He added before leaning back to place a gentle kiss on your forehead

"You'll be a great hero. I believe in you" He muttered, his cheeks turning red as his red eyes stared back at your glossy (e/c)

"Kirishima- no, Eijiro..." You trailed off, you gently pulled his hands to make him to bend down

"Thank you" Your cheeks were slightly pink as you thanked the male. He placed his hands on your cheeks and slowly pressed his lips against yours, despite being surprised; you recovered quickly and moved his hands down your waist so you could wrap your arms around his shoulders as you returned the kiss with much gusto.

Once you both leaned back, you panicked and pushed him away

"I-I'm sorry!" You squeaked as you turned away from him and hid your face, he let out a chuckle before walking behind you and wrapping his arms around your waist

"You're so cute! It makes me love you more" He stated as he placed his head on your shoulder.

You slowly removed your hands from your face and stared at him through the mirror

"How can you love... a monster like me?" You asked him, a sad expression replaced your previously flustered one

"I guess I'll have to show you that you're not a monster" He muttered, he tried to be as gentle as he could as he pushed you to sit on your bed. He placed a hand on the back of your neck and pressed his lips against yours.

I had to remove the lemon part cause I really can't write it well for this one I'm sorry QwQ