Chapter 1: Gluttony

In a children's hospital suite in the Gunga Hospital complex, in the island nation of Japan, a doctor was currently sitting in a rolling chair while looking over the files of the patient who was sitting across from him on a patient's table.

Said patient was a four year old little girl with shoulder length green hair and matching green eyes. She also seemed to have a curiously intelligent look in her eyes far beyond what any child her age should even have at all.

She was dressed in a simple purple dress and purple socks, and seemed to have an All Might pin in her hair.

"Well, doctor? What is your prognosis?" A voice questioned the man, causing him to turn to a tall man in a dark suit, tie, and fancy shoes. A black fedora on his white haired head.

"It would seem that this girl has the ability to copy an infinite number of quirks, though it would seem that they disappear after a certain period of time, and she either has to see or make contact with the quirk in question." The doctor explained. "Though I believe that we can circumvent this drawback by using the quirk we acquired a few months ago–." He continued.

"Say no more, doctor." The fedora man nodded. "I can see where your plan is headed, and I approve." He added.

"Then go ahead and place the quirk in the child." The doctor prompted.

The girl seemed confused about what the men were talking about, but was too curious to try and stop them, so she made no move to do so when the man in the suit patted her on the head, his hand radiating.

Then she felt… something, entering her body. She didn't quite know what it was, but it wasn't hurting her, so she wasn't complaining.

"Now, miss." The man said, dropping down to her eye level. "Would you like us to let you copy and learn about all of the quirks you possibly want to study?" He questioned, playing into what he assumed was a gluttony for knowledge on the girl's part.

"Yeah! I wanna learn as much as I can about them!" The girl exclaimed in glee.

"Well, luckily for you, little lady, I gave you a special quirk that works with the one you already had. Now you can not only copy a quirk, but also keep it forever if you like it enough." The fedora wearing man explained with a smile.

This caused the girl's eyes to light up like a Christmas tree as she gave a giddy smile. "More more! Show me more! I wanna see all the quirks!" She exclaimed, almost bouncing in her seat.

"Haha! Calm down, kiddo!" The white haired man laughed in amusement. "I've got a couple that could be good for you." He added, reigning in his laughter to a chuckle.

"Yay!" The little one cheered.

The man then held his hand out as the girl hopped down to follow him. "My name is Torusube Shigaraki, and what may I ask, is your name?" He asked her as she took his hand.

"Izumi Midoriya." The girl replied as the two followed the doctor into a lab.

(Timeskip)

In Mustutafu, Japan–about eleven years later–Izumi Midoriya was now making her way to school, and now she looked very different than when she was a child.

Her hair length now reached her shoulder blades, for starters, and she also had a red tattoo of a boar on her neck just below her left ear. Additionally, she also had a beauty mark under her right eye and now took to wearing a bit of lipstick.

Figure wise she became quite the vixen.

She had a nice C-cup bust that went well with her hourglass figure, a heart shaped ass and legs that would catch the attention of any guy in her age group.

In fact, it had on several occasions, but for some reason, no one ever came onto her. This of course frustrated the girl to no end, as she'd always wanted someone to love her, but with that being the case, she threw herself into her closet hobby: Her hunger for learning about quirks and heroes.

It was how she got her nickname, after all–the Boar Sin of Gluttony.

As she came up to her usual train station, she saw a crowd that was watching a villain rampaging at the place, much to the girl's ire.

"Oh great. Just what I need today." She sighed in irritation.

Deciding to take notes on the quirks that were flashing before her from both heroes and villains, she was sure to be thorough–as she'd copy them later.

That was her quirk: Infiniti. This quirk allowed her to copy any quirks she came in contact with and use them for an indefinite amount of time. Even being able to use combos if she wished.

As she watched the fight unfold, she noted Death Arms and the new hero, Kamui Woods deal with the giant villain while Backdraft formed a barricade to keep civilians away from the danger. Right as the wood hero was about to restrain the villain, however…

BAM!

A giant woman came out of nowhere and kicked the guy into unconsciousness. Then she started posing for the camera while men took advantage of the fanservice.

"People these days…" Izumi sighed in exasperation.

As the attack winded down, Izumi continued on until she reached her classroom, sitting down in her seat while her teacher talked about everyone considering picking a career–only for all of them to go nuts as they displayed the desire to get into the hero track.

Izumi didn't join in, as she thought that they were acting stupid, not really feeling like she had to show off like everyone else.

That was, until one of the students spoke up over the crowd of twenty odd kids.

"Hey, teach! Do me a favor and don't lump me in with the rest of these D-listers!" One Katsuki Bakugo yelled over the noise. "I'm the only one here who's good enough for the hero track! There's only one good place for that and it's UA High!" He continued.

"Going to the national school? It has a .2% success rate. It's nearly impossible to get in normally." Izumi said, flipping through her notebook idly, not really paying attention to the blonde's bluster. "The only guaranteed way to get in is through recommendations and I highly doubt you'd get something like that." She added.

"Wha–! Take that back! I will get in without a recommendation, Izumi!" The red eyed boy exclaimed indignantly.

"Make me." The girl deflected, still looking at her notebook.

"Ah yes, Midoriya. You're planning on trying for UA too." Their teacher nodded

"Oh I am, alright." The girl shrugged, not even looking up from her notes. "I know what I have, and how to use it. It may be impossible to get in, but I think I have a fairly good shot." She added nonchalantly.

"And you think I don't?!" Katsuki questioned.

"It's not a matter of skill I'm referring to. It's more a matter of… Temperament." The Sin of Gluttony replied. "I don't think they'd let someone as hothead as you in without serious supervision. Not saying it's impossible, just saying I know how these teachers operate." She shrugged, tucking her hair behind her ear.

"Okay, that's enough, you two. We still have a class to do." Their teacher told them, causing Katsuki to grunt as he sat back down in his seat while Izumi put her hero notebook away.

(Later)

Izumi sighed as she put her stuff away to leave the classroom, only to feel herself get slammed against the classroom wall as an angry Katsuki looked down at her.

"You really think I'll just let you get away with you looking down on me like that?!" He snapped with a glare.

Izumi hissed as she looked up at the boy in front of her before she smiled, placing a hand on his cheek as she looked at him with almost seductive eyes.

"I dunno, seems more like you're the one looking down on me here." She purred as she ran her hands down his body slowly until they reached his chest–and then she used his moment of distraction to turn him around and slam him against the wall, her chest against his back as she had him pinned.

"What the–!" He yelped in surprise.

"Oh come now, Kacchan. I've had this little maneuver in the bag for years." The verdette chuckled as she kept him where he was.

However, when she put her hands on his neck, the boy grabbed them and slammed her against the wall again, her hands above her head, and uniform popped open, revealing her bra clad chest.

Izumi panted as she looked at Katsuki, and then the position they were in, before turning her cheek with a perverse grin.

"Expecting a kiss, are we?" She purred, a blush forming on her cheeks. "What's your next move–Kacchan?" She questioned, hooking the boy around his waist with one leg.

Katsuki's eyes went wide as he realized what he set himself up for before he quickly disentangled himself and took a few steps back, trying to calm his racing heart and get rid of the blush on his face. Izumi, meanwhile, giggled at his expense.

"You really can't take much teasing, can you?" She teased as she buttoned her shirt back up. She then walked up to him and dragged a finger across his face and raised his chin up. "I wouldn't have minded, just so you know." She told him as she walked away, hips swaying and swishing her skirt.

Katsuki stared at her as she walked, his eyes fixated on her ass the whole time. When she was gone, he snapped out of his trance.

"That girl is gonna be the death of me somehow…" He muttered with a bigger blush than earlier.

(Elsewhere)

Izumi let out a frustrated groan as she levitated her favorite Fushigi ball in her hand, using a scrying quirk that she'd copied years ago to see all the possible ways that her previous situation with Katsuki could have ended.

And of course, the way it ended was one of the ones out of the 14,000,605 outcomes, it had to be one of the ones she didn't want to happen.

"Come on! Let me find a kickass boyfriend already!" She exclaimed angrily to the sky. "Honestly, this is getting annoying!" She growled, right before a green mass of slime became reflected in her orb behind her.

"Oh look, a skin su–" The mass started to say before Izumi blasted him across the tunnel they were in.

"I am not in the fucking mood for your shit, asshole! So do me a favor and fuck off!" She yelled at him, having used a shockwave quirk she copied to dispatch him. "Seriously, what is it with things today…" She sighed, walking away until a manhole cover popped up behind her and someone jumped out of it.

"There's no– huh?" A booming voice started to say before noticing the situation's aftermath. "I guess I'm not all that needed." He mused. Izumi turned and blinked at who she saw.

"Oh, hi, All Might." She greeted casually upon seeing the No. 1 Hero…. Then that information sunk in. "What the-?! What're you doing here?!" She exclaimed in excitement, not just because she was looking at her favorite hero in person, but also because this meant she could take this opportunity to see and study his quirk up close.

This was a great opportunity for her and her gluttonous mind.

"I was chasing down a sludge villain… one that you appear to have subdued." The man replied, glancing around. "Now, I just have to clean this up." He added, opening up a 2 liter bottle of soda he had with him and emptying it.

"Oh, let me help out with that." The girl said before she started concentrating. "Endless Whirl!" She exclaimed as a tornado started tearing through everything around them before funneling all the slime and funneling it into the bottle, which impressed the muscular hero a good amount. "That should do it." She told him.

"Impressive." The man nodded as he put a cap on the bottle. "Young woman, what is your name?" He asked.

"Izumi Midoriya. Though I am also called the Boar's Sin, the Sin of Gluttony." The girl explained.

"Boar Sin of Gluttony? What did you do to garner such a title?" The No. 1 Hero wondered in confusion.

"It's because of my quirk, which lets me copy and store an infinite number of quirks I know or come in contact with." The girl explained. "For example, see how I have such fair and glistening glossy skin? That's because I copied the quirk of my best friend's mom, Glycerin, when I was thirteen." She said, her skin seemingly shining in the sunlight.

'Her quirk… it's almost like…' All Might thought before shaking his head. 'No. It's more like an evolved version of his quirk. Not to mention she's not copying quirks out of malice. She sounds like she's more of a scientist of sorts, if nothing else.' He continued.

The man then knelt before her and took her notebook from the ground, before writing on it.

"Here's your notebook back, young lady." The man said. "Take care now, I must be off." He told her before leaping away.

This caused Izumi to panic, as she wasn't ready to stop speaking to him yet–especially when she still wanted to study his quirk. She couldn't let him get away, at least not yet!

"Damn it! Gotta go after him!" She hissed before using a flight quirk to try and catch up with him.

Luckily for her it was an easy task, but in her haste to catch up, she ended up shooting past him and onto a rooftop–causing the man to lose balance and land a little shaker than he had planned, but otherwise fine.

"Whoa!" All Might gasped as he tried to get his balance back, managing to do so a few moments later. "What exactly made you chase after me like that?!" He questioned the girl, sounding lightly peeved about her sudden appearance.

"I'm terribly sorry, All Might, but–you see–I love learning about quirks, almost as much as I enjoy learning about heroes." The Sin of Gluttony explained, bowing apologetically. "And, well, your quirk is by far one of the most powerful, if not the most powerful. And… It would be a tremendous honor if you could allow me to copy and study your quirk, even if just for a little bit! I don't want to miss out on such an amazing opportunity!" She exclaimed, eyes shut tight.

'She want's to…' The man trailed off before he started steaming. 'Shit, no! Not now!' He gasped mentally before his whole body was consumed by steam.

"Huh? All Might what's–Oooh my." The girl questioned before gasping as she saw a now almost skeletal All Might whose body looked like it was just on the mend from a recent stomach transplant.

"... Shit." The man sighed as he coughed rather harshly.

(Later)

A few minutes later, Izumi was now examining a still healing injury that All Might had on his stomach. Partly from the initial wound and from the surgeries.

"So let me get this straight." The girl said, backing up. "Five years ago you got this injury during a fight with a villain as powerful as yourself–with him dying and you getting this injury." She continued. "And this same villain was the one who had killed your predecessor?" She added.

"That's pretty much the gist of it." The lanky man nodded in reply. "I lost my respiratory system and stomach in the fight, but got this transplant last year so I can recover." He added. "But that only bumped my time limit up to four hours, so not much has changed." He sighed.

"I see… " The girl sighed. "I wish I could help in some way, but unfortunately I don't have any recovery based quirks as of yet, I'm sorry." She told him apologetically.

"Don't worry about it. I've managed this long, and I'll continue to do so." The blonde told her. "My real name is Toshinori Yagi, by the way." He added.

"It's nice to meet you, Mr. Yagi." The girl nodded. "So, would it be possible for me to try and study your quirk?" She questioned, deciding to get back on topic.

"I'm not sure if–" The man started to reply before an explosion went off in the distance, causing the two of them to snap their heads in the direction it came from and see a column of smoke rising up.

"What the fuck?!" Izumi gasped before she looked at Toshinori and spotted his apparently empty pockets. "Toshinori, your pockets! The bottle holding that villain is gone!" She exclaimed, causing the man to search his pockets and come up empty.

"Shit! Let's move!" He exclaimed before the two of them started running toward the blast site.

Upon arriving, the two of them saw that the sludge villain had not only gotten free, but had also taken Katsuki hostage. The explosive boy was trying to use his quirk to get free, but was only causing more collateral damage than he should be.

"Oh no, Katsuki!" Izumi gasped, covering her mouth in shock.

"You know that boy?" The Symbol of Peace questioned.

"Yes, he's–he's…" The Boar Sin nodded as her eyes started to fill with tears. "This is all my fault…" She choked.

"What?" The Symbol of Peace asked as he glanced at her, but got no answer.

Izumi watched as Katsuki struggled to get free to no avail, seeing the growing look of fear in his eyes. The fear of dying. The Boar Sin couldn't stand it.

"No. No. I won't let him die. I can't!" The girl said, before her body started moving on its own, with the girl's levitation orb floating out of her bag to help her use her quirks more effectively. "Copied Quirk: Explosion - Use: Stun Grenade!" She exclaimed as she gathered up nitro sweat from Katsuki's quirk and then released it as a bright light, forcing the sludge villain to become blinded and release Katsuki.

"Gah!" The pomeranian blonde gasped as he got his mouth free. "That's one hell of an assist! Nice one, Izumi!" He told her.

"Don't thank me yet!" The girl said as she sifted through another copied quirk. "Copied quirk: Fiber Master!" She exclaimed, using the quirk she'd copied from Best Jeanist after meeting him in person–grabbing Katsuki by the fibers of his uniform and pulling him free from the villain's grip, both of them tumbling to the ground in the process.

"Gah! You little bitch, I'll kill you and that shit friend of yours!" The sludge villain roared angrily as his sight returned.

Katsuki groaned as he got up, and realized that he was on top of Izumi right now.

"When this is over, we're finishing what we started." He told her.

"What're you…?" She questioned before shaking her head. "Doesn't matter." She said as the two got back up. "Let's just get this slime ball." She said.

"Right behind you." The boy nodded, explosions going off in his hands.

However, as the two got ready to throw down with the giant slime villain that had been messing with them all day, they were suddenly saved from an attack directed at them.

"Look at this, an area full of pro heroes and we had to abdicate to two children." All Might said as he blocked the attack. "I really am pathetic, aren't I?" He sighed.

"You really picked quite the time to intervene, didn't you?" Izumi remarked.

"Yes I did, it would seem." The blonde nodded. "Now, to deal with this scum! Detroit SMAAAAAAASH!" He roared before he threw a punch strong enough to make a tornado… and change the weather a moment later. In the end, the sludge villain was dealt with.

"Incredible…" Izumi gasped.

"So that's what it means to be the strongest…" Katsuki nodded.

(Later)

All Might was then swarmed by reporters and both Katsuki and Izumi were checked for any further injuries.

Needless to say, they were livid at Izumi for rushing in like she had, but soon found that trying to reprimand her was pointless by then, as her mind had since then switched gears to analyzing their quirks via contact and copying them.

After that, the two teens started making their way home. Though Katsuki had quickly caught up with Izumi, intent on finishing what started after school earlier.

"Whoa! What the–?!" Izumi gasped as Katsuki grabbed her by the wrist, spun her around and pressed her close to him, his right arm around her waist.

"Alright, Crimson Boar. I'm only gonna ask you this once." The blonde stated.

"What are you?" The girl questioned, looking up at him.

"Cut the dumb act! Ever since middle school started wrapping up, you've been getting real flirtatious. More than usual." He retorted. "And it's been especially brutal with me!" He continued, slamming her against a wood fence. "So cut the crap! Get to the point and tell me just what you want from me?!" The blonde yelled as Izumi looked up at him.

Her face was full of shock, surprise, and a bit of confusion as to why her flirtatiousness got to him so much when he clearly never showed any interest before… At least until her head was finally able to connect the dots.

"What do I want with you?" The Sin of Gluttony questioned before she got one of her hands free and stroked Katsuki on the cheek as she grinned at him seductively. "Where should I start?" She purred.

"J-Just get on with it already!" The explosive teen stuttered with a blush.

"Oh finally!" The girl exclaimed as she grabbed the back of the blonde's head and kissed him, hard, her leg wrapping around the boy's waist as she did this.

Katsuki, meanwhile, was sure his brain crashed for a second when Izumi kissed him and was frozen. When he snapped out of it, though, he was quick to reciprocate the kiss and picked her up by her legs, her other leg wrapping around his waist as he held her up.

"That's what you wanted? A kiss?" The Pomeranian questioned, a little annoyed that her desire was just that simple.

"I wanted you to initiate, but you wouldn't do it earlier." The girl told him in reply. "Now, I want you to take the next step forward here." She continued, before whispered in his ear. "Make me your woman." She added.

Katsuki was tempted, he really was, but he decided that this was not the time or place for that.

"Not today." He told her, causing the Boar Sin to pout in frustration. "But, if both of us get into UA, maybe we'll manage it then." He added.

"I'll hold you to that." The Boar Sin nodded, kissing him once more, before they parted ways.

Seconds later though…

"Hahahaha! I am here!" All Might exclaimed, zooming into view.

"Gah!" The girl yelped in surprise at the sudden appearance. "I thought you'd still be busy with the press!" She exclaimed before the No. 1 hero deflated.

"Nah. I finished dealing with them a while ago. Anyway, I was looking for you, actually." Toshinori told her in reply.

"Really?" Izumi questioned. "Why? I screwed up your capture." She added.

"But you made up for it in the end." The man corrected. "But that's not why I'm here." He added before looking the girl in the eyes. "Young lady, you will not simply study my quirk, but I wish for you to inherit it!" He told her firmly.

"Wait… What do you mean by "inherit"?" The ever inquisitive Izumi questioned in confusion and curiosity.

"My quirk is a special one called One for All, a stockpiling quirk that grows in power as it's passed along." The No. 1 hero explained. "This power, it has been cultivated in order to defeat the great evil I mentioned, the quirk of its antithesis: All For One. A quirk that allows the user to steal quirks and either keep or pass them onto others." He continued. "A quirk that is eerily similar to yours." He added.

"Strange…" Izumi muttered in contemplation. 'Stealing quirks to keep or pass on to others… Did I actually meet him back then?' She thought, recalling the meeting she had with that white haired man when she was four.

Though she decided not to bring this up with Toshinori, at least not now.

"Well, young Midoriya? Do you accept my offer?" Toshinori questioned.

"Yes. I accept." The girl nodded in reply.

"Good, then we begin training you. First thing next week." The man nodded with a grin.

Let the story of the Boar Sin of Gluttony begin.

Dragon Emperor0: That's number four out of seven "Seven Deadly Dekus" story series out of the way with the Sin of Gluttony. This version of Izuku, Izumi in this case will be the same kind of ravenous knowledge seeker like in canon. But as you can see, it's partly because of the quirk she has rather than because of a lack of a quirk.

ThermalsniperN7: And she met All for One himself as a child, too. Can't say I'm surprised by her lack of action at the time. Seriously, you can't expect a child to identify an old villain like him immediately, can you? Plus, AFO's had, what, 200 years-ish of experience living in disguise among other things? That could help him not get spotted at all.

Dragon Emperor0: And as for why he was so interested in her, I have a feeling it'll have something to do with Ujiko eventually figuring out how to copy quirks to use in Nomus. Like a living quirk archive or something.

ThermalsniperN7: It'll also have a high risk of coming back to haunt them worse than a Revenant hunting its target. You can't look at someone who can copy any and all quirks they come across and not feel like mistakes were made… Speaking of which, no, Izumi ain't letting it go to her head like Monoma did with his own quirk.

Dragon Emperor0: She copies and keeps quirks to study them. Not going on a power trip… Though the fact that she's taken to telling Katsuki straight up to make her his woman. Makes me wonder if she's gonna take to getting into relationships with boys that have quirks she likes… and girls too, probably.

ThermalsniperN7: Hard to tell at the moment. Anyway, see you guys next time.