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English
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Published:
2025-09-13
Updated:
2026-09-06
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7,607
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9/?
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Sex Quirk: Various Yandere My Hero Academia X Fem Deku X Yandere All Smite

Summary:

Izuki Midoryia was thought to have no Quirk of her own. That was until her eighteenth birthday. After that day, she could charm any man or woman. Also, it made so many people become attracted to her. On recommendation from All Might, she is allowed into UA University. Her life is not going to be the same. She can now be a hero, but did she want to be this type of hero...

(All characters are eighteen years or older)

(DISCLAIMER: I AM CHANGING IZUKI NAME TO IZUMI I LIKE IT BETTER CHAPTER 5 IT CHANGES-)

Chapter 1: 18th Birthday

Chapter Text

[Hello, My Sexy Muffins! I am here with a new story, and in this it comes from my sleep-deprived brain! So please enjoy this chapter!]

(No One's POV)

Izuki was sick, this whole week she felt off, then these last two days she has been burning up. Finally, her fever broke, but her mother rushed her straight to the doctor's.

"Please, Doctor, something has happened, my daughter has fangs, claws, and her body has changed!" Came Izuki's mother's voice.

Izuki groaned; her mom was not in the room, but she could hear every word. Everything was so loud. She let out a growl, and soon the doctor came in.

"My God!" He says, and soon he was taking samples of blood, saliva, and so much more.

Izuki was still out of it, but she bit the doctor a couple of times when he was too rough with her. Her mother was panicked, and finally, after 3 days in the ER, it was confirmed. Izuki had a very rare quirk, which only happened one other time.

"It is called the Sex Quirk. Your daughter turned eighteen, and that is when this quirk changed the one other person." The Doctor explained. "This Qurik is a medical mystery, and it is very powerful. I had to alert the top heroes of this because your daughter has great potential."

"Will she be okay?" Her mom asks.

"She will be fine. Right now, she is having growing pains from the changes to her body. She will be able to go to school come Monday morning. I suggest she become a hero; it will be the best way for her to learn to control her powers."

With that, she was left at home, and for the next two days, all Izuki did was sleep and eat a ton of food.

-Monday Morning-

"Are you sure you are ready to go back to school, sweetie?" Her mom asks. "You can stay home."

"I feel great, Mom!" Izuki says, flashing a fang-tooth smile. "I can finally become a hero!"

She left for school, and she could not wait to see the look on Kacchan's face.

On her way to school, she saw a villain who was assaulting a girl. She saw red, she walked up to him and punched him in the face. Then touched his cheek.

"You will stop what you are doing and wait for the police." She says.

She stayed there, and the police were shocked. "You are just a student." They say. "How did you stop him?"

"I just did." She laughs, the news was there, and she did not notice they caught everything.

-Meanwhile in class-

"Alright, class, I have some shocking news to share with you all." The Teacher says. "Your Classmate, Izuki, has developed a quirk. She will look different when she comes in, also she secretes pheromones that make her more likable. You are not to have sex with her."

"What the fuck do you mean she got a quirk!?" Bakugo demands.

"It is called the sex quirk; it only ever happens in one other person. It does not come out until the age of 18. Izuki was not Quirkless after all; she was just a late bloomer."

The door slides open and everyone's eyes lay on Izuki, getting her quirk made her hair grow out, her body become more curvy and thicc, and cleared up any acne. She looked like a model. Also, she had a succubus tail, sharp nails that could turn into claws, and bright white fangs. Not to mention pointy ears like an elf.

"Sorry, I am late, Sensie. A man was assaulting a girl, and I had to stop him." She says with a bow.

"HOLY SHIT! DEKU IS HOT NOW!" A boy shouts, and Izuki blushes, looking away.

"You can take your seat, Izuki." The teacher says, blushing, she was a 10 of 10. Also... She is legal now...

She walked in and sat behind Bakugo, who was staring at her. He ALWAYS had a crush on Deku, but she was now a total babe.

Class started, and Izuki was finally excited for school.

"Anyways, it is time to start applying to the universities you want to go to!" The teacher says. "I could hand out a bunch of career assessments, but I know what you all want. You all are going the hero route! But remember to get into a good Hero University course, you still have to have good grades. Which, honestly, most of you are all lacking."

"Ha!" Bakugo laughs. "Do not lump me together with all these rejects, teach. I got the grades and the Qurik to get into UA University."

"Yes, you do." The Teacher said, and Bakugo smirked. "But you do have competition now."

"What!?" He demands.

"Izuki wants to go there too, and with her rare qurik, I already have the facility asking me to push their University on her. In fact, every Hero University in the country wants her to attend."

"Really?" Izuki asks with her eyes wide. UA wanted her?

"The FUCK!" Bakugo snaps. "She just fucking got her Qurik and they want her!"

Bakugo turns around, ready to blast the stupid Deku off the planet. But he froze when he saw her, fuck! Why does she have to look so cute!?

"YOU- YOU BETTER NOT THINK YOU ARE BETTER THAN ME, DEKU!" Bakugo snaps, and then classes continue.

Izuki could not stop grinning. She actually has UA wanting her to be a hero! This day could not get better!

[YASSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS another chapter is done! I hope you all enjoyed this, and stay sexy, all of my sexy muffins!]