A/N - To any of the people who fallowed this story before, sorry that it got taken down along with everything else. I hope you all can find it again and I'll see about getting all the chapters back up, it might take awhile though. I managed to copy over every chapter from Wattpad but the formatting is a little different, so I'll have to skim through each one.

Once again, I'm sorry for everything getting all screwed up.

Disclaimer - This story is a work of fan fiction. I own none of the properties involved. All characters involved have been aged up to 18 and above.

BAM!

Izuku slammed the door to the dorm room shut and braced against it with his back. He panted heavily for air but quickly pinched his nose and held his breath as he heard footsteps charging down the hallway. Both to keep quiet and so he wouldn't smell them as they passed by.

The footsteps grew louder but then quieter as whoever it was, charged passed his door in pursuit of him.

Izuku waited as long as he could before breathing again, his face turning a little blue, before finally gasping for breath.

"Damn it! Of all the Quirks I could have been born with...why this one!" Izuku lamented with a sigh, as he looked down to his hand and saw a thin sheen of some kind of substance. Not enough to look or feel wet, in fact one wouldn't notice unless they were extremely observant or knew what to look for.

Yes, Izuku had a quirk. One that he was born with but wouldn't activate until after he turned 18. A quirk that they had kept secret from him.

It stung to know what his doctors did, but he could understand given his quirks nature, or at least what he could learn of it before being forced to run, but it didn't make it hurt any less, or save him from the situation he was in now, do to being unprepared.

One might be asking how this all started and how Izuku discovered his quirk.

Well for that, we need to go back a little bit.

Earlier today, during combat practice, Izuku and the rest of the class were fighting the teachers, and he just so happened to be with most of the girls from 1-A and was fighting against Midnight and Cementos.

The concept was simple. Navigate the sifting cement maze while avoiding Midnight's pheromone quirk.

The test in and of itself wouldn't have been a issue, they even made it a pretty decent way through, with only a few getting knocked out, before Izuku himself got a whiff of her pink gas. Not enough to pass out, but enough to get drowsy.

Or at least that's what he had thought, unaware of the changes to his own biology that made him now immune to the knockout aspect of her quirk. Years of minute exposure over the corse of his stay at UA, had triggered his own quirk to awaken a little sooner then expected, and now Izuku was beginning to feel hot.

"What is this?" Izuku asked as he held his nose "what's this smell?" he muttered as, even with his nose pinched, he still got a hint of Midnight's gas. It was like his sense of smell was heightened in some way and his head was staring to swim as he got sweaty.

"DEKU!" a familiar voice called out and suddenly he found himself being tackled out of the smoke by a flying, white and pink meteor.

"U-Uraraka!?" Izuku asked with surprise as she tried to save him from Midnight's quirk and he blushed deeply at how they landed, with her practically straddling him and her B cup breasts sandwiching his face. The skintight suit leaving nothing to the imagination.

Uraraka pushed herself up, letting Izuku breath as she looked around for any threats, then look down to him and froze.

At the time, Izuku had been very confused. He would learn later that her bare hand, had brushed the exposed skin on his face, letting the pheromones in his sweat get on her, which was why she was breathing really hard now. Then Izuku's new enhanced sense of smell kicked in and he got a whiff of something off Uraraka.

Something wonderful.

It was the most intoxicating aroma he'd ever smelled and he found his own breath quicken. Too caught up in the moment to notice Might Jr. in his pants, trying to pitch a tent and failing do to his suit.

Before anything else could happen though, the cement walls suddenly shifted and pillars shot out with the intent of hitting them.

Izuku acted instantly and instinctively. Activating One For All and picking up Uraraka and kicking the pillars to bits.

That was his fist mistake and the moment when his nightmare in heaven truly began.

In that moment, there was an explosion of mist from his body, not unlike Midnight's quirk.

The cloud enveloped the entire school in seconds, triggering a biohazard alarm do to there being no quirk like this registered at the school, and everything locked down.

Only a few were aware of this though, as the mist and pheromones took effect instantly.

Izuku was stunned by what happened and tried to wave the mist away as he held Uraraka, though it only settled an knee hight, creating a constant fog that refused to go away.

"What was that?" he muttered to himself but froze up again as he smelt that wonderful fragrance again. He quickly recognized that it was clouding his mind though and pinched his nose.

"Uraraka, something wro-muff!" Izuku was cut off by a pair of soft lips smashing into his and his brain stalled. His arms going slack and letting the girl in his arms fall to the ground, which also broke the lip contact.

Izuku just stood there for a moment, staring at nothing with blank eyes.

"Deku~" Uraraka moaned out from the ground and the greenet blinked back to reality, only to look down and see his friend and secret crush splayed out on the ground and looking up at him with hunger in her eyes and drool in the corner of her mouth. Her chest heaving with heavy breaths as her face burned atomic red.

"Take me!" She suddenly exclaimed to him while grabbing her left breast in her hand and working it while trying to pulled her pants off, to little success.

Izuku just stared for a few seconds as his friend continued to pant and beg for him. His own face then turned just as red as her's and a jet of blood shot out of his nose, forcing his fingers away from it.

"U-U-Uraraka! Whoa!" Izuku stuttered but had to dodge as she lunged for him and he quickly pinched his nose again before his mind could get too foggy.

"What's happening? Did some villain use his quirk on the school!?" Izuku thought as he slowly backed away from his friend, who was now crawling towards him.

"Please Deku~ Please take me now!" she begged him as she tried to pulled her costume down to reveal any kind of skin to him, only to curse her suit's designers, who made it with avoiding wardrobe malfunctions in mind.

Izuku desperately wanted to help his friend. He wanted to do anything to snap her out of it. But when faced with the sight before him, he did the only sensible thing he could think of in the moment.

He activated Full-Cowl and ran.

"DEKUUUUU!!!" Uraraka wailed in desperation as he ran as fast as he could. Bouncing off the walls of the maze.

"Gotta find help! Gotta find help!" Izuku repeated in his mind like a mantra to help ignore all the smells he kept passing by that seamed to mess with his head.

It was then that he spotted one of his classmates.

"Momo!" he called out with joy. To relived to notice anything else as he landed behind her.

"Momo, I'm so glad I found you! Something's wrong with Uraraka and..." Izuku trailed off as he finally noticed Shoto laying on the ground unconscious.

"Izu~" Momo suddenly spoke before Izuku could question anything, and she did so with a tone that sent a jolt of electricity up his spine as he had to pinch his nose again.

Momo then slowly turned to look at him over her shoulder with the same desire filled gaze his beast friend had.

"Ravish m-" Momo started as she turned and gripped her easily removed costume with the intent of pealing it off and exposing her incredible assets to Izuku.

The green clad hero was quicker though, and yelled in fear, as he used Black Whip to ensnare her. Making sure to rap the black misty tentacles around her so she couldn't pull anything off.

He was about to restrain her properly, when another voice filled him with dread.

"Ooohh, kinky~".

Izuku gasped and slowly turned his head to see Mina standing behind him. Bent over, with a finger pulling down her suit enough to show off her pink cleavage and was about to show more.

"I can't wait to try it out and show you some of my own~" she said with a sultry voice as she accentuated all of her curves and pulled her suit down further, only for Izuku to trap her the same way he did Momo.

An action he regretted as Mina moaned slightly in pleasure at being bound so tightly, causing Izuku to cringe. Especially when he realized he'd let go of his nose and was being assaulted by so many enticing smells that seamed to arouse him.

"Kiro"

Izuku's stomach took a swan dive and his face filled with dread, as he heard the frog-like croak and looked up to see Tsuyu sticking to the wall above him. His amphibious friend licking her lips as she stared him down with that same deadpan expression as always.

Izuku gulped with fear.

They had him surrounded.

Or at least that's what they thought, as even Momo looked both triumphant and expectant while still bound.

All three were disappointed and calling out to him as he dropped the two girls and punched down the wall Tsuyu wasn't hanging from, and kept going. Braking down wall after wall, every time he saw one of his female classmates, until finally he jumped up out of the maze.

"Gotta find a teacher!" he thought as he kicked the air, sending him flying over and out of the maze, where he landed in front of Midnight and a knocked out Cementos.

"Sensei! Something wrong with-" Izuku started but froze up again as he realized something.

"Ara~ So the big man finally made it out, and came right to me. You definitely know what you want~" Midnight said with a flirty tone as she snapped her whip and began pulling open her suit in a slow and sensual fashion. Ready and willing to get down and dirty with a student.

"Nope!" was all Izuku responded with, before releasing a smokescreen and running as fast as he could, knowing he wouldn't be able to handle a pro as well as his classmates.

"Gotta find a MALE teacher!...who's not knocked out!" Izuku thought in a panic as he saw that all the males on school grounds, save for himself, were all unconscious, and every girl seamed to be hunting for him.

"Oh, what do I do!? What do I do!?" Izuku thought as he continued to run. It was all he could do with a mob of superpowered and thirsty heroines in trining and veteran pros hunting for him, while everyone else was out cold. His greatest fear so far was running into Toru. After all, it would be hard to dodge a naked and horny, invisible girl.

"The school's locked down so I can't get out or let anyone in to help. I can't hide, there are too many here with sensory quirks and I don't what to risk hurting them in a fight. There are too many to restrain. Why is this happing though and why am I the only guy not effected. Is it an attack- mutter mutter mutter mutter mutter-"

"Mutter"

"Mutter"

"Mutter"

Izuku droned on as he ran.

He was so out of it, he didn't notice until it was too late, that Eraserhead's captured weapon was suddenly thrown out into the hall, tangling him up and pulling him into one of the rooms, where the door slammed shut and locked, with a blast door falling over it.

"Ah! No please! I'm not ready!" Izuku screamed as he struggled to brake free but didn't want to risk hurting anyone by using full power.

WACK!

Izuku was cut off by something hitting him over the head.

"We're not trying to screw your brains out idiot! Now stop using your quirk, or this situation will only get worse!" An old, feminine voice, berated him and Izuku's eyes snapped open in surprise, as he looked up to see he was in the nurse's office with Recovery Girl and Principal Nezu both standing in front of him, unaffected by whatever quirk this was.

Izuku was so relieved that he started crying in typical Midoriya fashion, and he finally relaxed and slumped forwards. One For All deactivating as he finally felt somewhat safe and the carbon fiber scarf fell loose around him.

"Finally! Thank goodness you two weren't affected! But wait, why weren't you affected? And for that matter why wasn't I? Who could be behind this? Could it be- mutter mutter mutter".

WACK!

"Ow!" Izuku moaned as Recovery Girl hit him over the head again.

"Brat we don't have time for this! We need to get your quirk under control!" the aging heroine yelled.

Izuku blinked in confusion though, as he rubbed his head.

"My quirk? What does One For All have to do with this?" he asked but then a look of horror dawned on his face "this isn't one of the quirks in One For All I haven't discovered yet is it!? Is this all my fault!?"

Nezu then stepped forward without his usual smile.

"I'm sorry to say this mister Midorya, but this is indeed your doing" he said with sympathy as he looked down at the boy, who fell forwards on his hands and knees with distress.

"I did this!? I'm made my friends..." he trailed off in disgust with himself and felt the urge to vomit.

"It's alright mister Midorya. This isn't your fault. If anything, you should blame the doctors who diagnosed you as quirkless" Nezu said with his usual cheer returning a little.

Izuku's head snapped up at the principal at that "what? What do mean by-"

Izuku was cut off by a folder being tossed to the floor in front of him, by a fuming Recovery Girl.

"When we get out of here, I'm going to ring those sorry excuses for doctors' necks out! Then I'm going to heal them so I can do it all over again!" she ranted before waking over to a gurney with a knocked out Eraserhead laying on it.

Izuku blinked at the elderly woman before looking down and picking up the folder.

"Wait...are saying that..." Izuku bagan, but didn't dare finish.

"You were born with a quirk Midorya" Nezu answered softly.

Izuku's hands started to shake as a million emotions ran through him.

Shock.

Relief.

Uncertainty.

Confusion.

Denial.

...

Betrayal...

...

"W-w-why?..." he stuttered out as he looked at the folder that he now realized was a medical file. Recently mailed to UA if the torn remains of a post stamp were any indication.

"Why would they lie? Did mom know, and if she did, why would she keep it from me?..." Izuku thought with distress.

Nezu shook his head with a sigh.

"Believe me, Recovery Girl and I are both disgusted by their decision to withhold this information from you the way they did. Especially given the recent consequences of you and the staff being uninformed and unprepared. However their reasoning was not without merit given your quirk's...unusual nature..." Nezu explained, though he seamed oddly uncomfortable with the last part. The change was notable enough to catch Izuku's attention and he snapped out of his funk enough to open the folder and start reading.

...

Only for his eyes to then widen and his face to turn scarlet as blood exploded out his nose.

Izuku quickly closed the folder and held it away. Both to protect it from the blood spray and so he wouldn't have to look at it. The folder somehow feeling unclean to his virgin hands.

"P-p-p-p-p-please tell me this is a cruel joke!" Izuku practically begged as he looked to Nezu. Unfortunately, the bipedal rodent hybrid just shook his head.

"I'm afraid it's not mister Midorya. Though the data available on your quirk is largely incomplete do to the only evaluation being your initial checkup with the specialist. Recent events confirm what little is recorded" Nezu explained with sympathy.

"Your quirk is geared entirely towards reproduction. The mist you unknowingly released is a pheromone cloud, similar to Midnight's quirk, except causing arousal towards you specifically in females and rendering only males unconscious" Nezu explained, much to Izuku's growing embarrassment and mortification.

Even now though, he couldn't help his curiosity and habitual need to analyze every quirk he came across.

"Why knock out the males though. And why are you and Recovery Girl unaffected?" he asked with an awkward blush.

"Elimination of competition" Nezu replied instantly and with a little excitement at being able to analyze and speculate about Izuku's quirk. He did feel a little guilty at deriving some form of entertainment from the situation at hand, but he couldn't help it. His darker and traumatized side demanded stimulation, and if it could help the situation in some way, he would allow it.

"By incapacitating rival males, you increase your own chances of mating and producing offspring. And since Recovery Girl is too old and I'm not Human, we weren't recognized as targets." Nezu continued but had to pause as Izuku shrieked in horror and smoke erupted from his head, as his spirit attempted to escape though his gaping mouth.

Nezu simply smiled as he waited for Izuku to come back to his senses and for his resident nurse to stop glaring at him.

It took all of Izuku's willpower not to pass out then and there. He was already in danger of becoming anemic from all the nosebleeds.

Izuku shook his head clear as he tried to organize his thoughts.

"Why didn't anyone tell me about this sooner! Now I've unintentionally drugged my friends and everyone at school!" he yelled out in exasperation.

"Yes, that was a terrible decision on their part, but not one without reason. The first and obvious one being that you were only four when you were diagnosed. The other reason is tied to another theorized aspect of your quirk" Nezu continued and gained Izuku's undivided attention again.

"Another theorized aspect of your quirk, is that you not only increase the chance of conception, but can also control what quirks your progeny receives" Nezu explained.

Izuku just stared at Nezu for a moment after that.

Then proceeded to pinched himself to make sure he wasn't dreaming, and gave a disappointed sigh at the very real pain he received.

"Ok, that is a pretty insane ability, but why would that make them keep quiet about it?" he asked.

"For your own protection. You know already the potential danger of people knowing about a Quirk that can be passed on to others. How do you think people and organizations would react if they knew they could control what quirks people were born with. Why if the wrong people got ahold of you and you really could do it, then they would have an army of extremely powerful soldiers, indoctrinated and trained from birth" Nezu explained with seriousness.

Izuku felt a led ball drop in his stomach at that. He did know how bad that would be, especially if someone like All For One found out.

If that happened, Izuku and some poor girls would basically be turned into breeding stock. Forced to cultivate powerful quirks for the worst villain to ever exist. A thought that sent ice running through his veins.

Nezu nodded as he saw the realization sink in on Izuku's face.

"Exactly, and while I don't agree with how they went about it, whoever mixed up your medical records clearly knew what would happen if the wrong people found out, and probably saved your life by doing so. At the very least, they were obviously planning to let you know after you turned 18, but your quirk awakened before we could relay the information to you or prepare for anything" Nezu explained.

Izuku groaned as he pulled at his hair.

"Oh, this is all too much! Why couldn't we have figured out about this sooner, and why is it so powerful!? I don't understand how so many pros could be knocked out so easily!" he vented his frustrations and confusion.

"You're forgetting an important detail brat!" Recovery Girl called out "you have another quirk that stockpiles power" she continued and Izuku's eyes shot wide.

"One For All" he spoke in horror as he realized why his quirk was so effective, with One For All amplifying it's power beyond what they may have originally thought. And he had been using Full-Cowl at a high percentage while running all over the school. If it really did amplify his original quirk, then just how bad were things.

Nezu gave a firm nod in agreement. As if he could read Izuku's mind.

"Indeed and I fear for the students' and faculty's mental conditions because of it. There's no telling how exposure to such powerful stimulants could effect them over a prolonged period of time. The only solas we can take at the moment is that this event is contained to the school grounds but we can't risk braking quarantine" Nezu spoke as he turned to Recovery Girl.

"On that note, any progress on countering the effects?" he asked and Izuku turned to the medical hero, who was now approaching him with a swab and syringe.

Izuku didn't ask questions. He understood what she needed from him and held out his arm, after removing his gauntlet and rolling up the sleeve so she could swab off a sample of his pheromone infused sweat and draw blood.

"Hmm...it will depend on what I can get from these samples. We may have to go to the support department to run proper tests" she explained as she took her samples then kissed Izuku on the forehead to heal him. She quickly leveled a glare at him though.

"This won't mean anything though if you can't get this under control. For now focus on shutting off your quirk while I focus on these samples" she ordered and Izuku went ramrod strait at the order.

"Yes ma'am!" he replied as an image of Gran Torino took her place momentarily. He may not have the same trauma as All Might, but the old hero still left his mark on Izuku.

Izuku quickly brushed that aside though as he clenched his fist and looked down at it.

Now was the time to work. He would spend what time he could focusing on gaining control of this power. He would-

BANG!

Whip his head to the door as it dented in.

"Oh dear" Nezu spoke as more banging and explosions were heard.

"It's useless hiding lover boy! Me and ears made a pact, so we know you're in there!" A loud voice was heard though the door, likely do to a vocal quirk or a megaphone.

Nezu quickly moved to a nearby shelf and hit a hidden button, opening up a secret exit.

"Go, we can't work on an antidote while dealing with them too. You need to lead them away and keep them busy" Nezu instructed.

"Yes sir" Izuku responded and he ran to the exit and activated Full-Cowl, but paused and looked down at himself. The last thing he needed was to spread the effects of his quirk more, but he wouldn't stand a chance if he didn't use One For All.

Izuku grimaced. He would just have to hope for the best. He did pulled back on the power though, in the hopes that it wouldn't super charge his quirk too much, and then bolted out the exit and resumed his evasion through the school. Shutting off One For All when he could and trying to get his quirk under control.

Which is what led to Izuku's current situation.

He had lead the girls of UA on a merry chase, but unfortunately, it appeared some had begun coordinating with each other out of desperation.

As such, those that were exhausted from the chase had time to recover, while those with sensory quirks tried to find his hiding places.

Fortunately, Izuku managed to incapacitate and restrain a few of them , if only temporarily, while leading them to the other side of the school. The real pain was avoiding the pros, who he didn't dare confront directly.

Fortune once again smiled on him though, as they were all too honey to think clearly and he was able to doop them into searching the wrong area.

Now the exhausted Izuku let himself fall to the floor to catch his breath.

Izuku pulled at the collar of his suit as the heat got to him. He was drenched in sweat and he couldn't tell if it was from his quirk or the workout of running nonstop for what had to be hours now.

"Ugh, I need to get this under control, or else it's never going to stop" Izuku bemoaned quietly as he tried once again to turn off his quirk or at least restrain it.

He found no success though.

Izuku sighed and looked around the room.

Apparently he had run into Uraraka's room. Something that made him blush lightly as his innocent mind thought of the scandal. Then his face burned even brighter as he remembered how the girl was when he last saw her. His mind going into less innocent territory as he thought of how her body had felt through the suit.

Izuku quickly slapped his cheeks to bring himself back to reality and out of the gutter. He'd already had enough near sexual encounters today to last a lifetime. He was honestly amazed, and slightly impressed with himself, that he'd prevented any of the girls from exposing themselves to him so far.

Though that probably wouldn't last much longer as the girls got more desperate. Especially if the one random girl yelling out that she'd start dressing like Toru if he didn't come out, was serious.

Izuku took a breath before standing back up and shaking out his sore muscles. He then decided to try and find something to dry the sweat off with. It was getting uncomfortable after all and he was already spreading his pheromones enough as is, without being drenched in them.

He tried flipping on the lights but nothing happened and he looked up to see a broken lightbulb. Izuku gave suspicions hum, but brushed it off as he refocused on ground level. Missing the shadow moving in the corner of the ceiling.

Miraculously, he found a dry towel hanging on the door to her closet. Probably left behind after a trip to the showers and dried on it's own while hanging there.

Or at least that's the logical conclusion Izuku's mind reached. Had he not been so tired and scatterbrained do to everything that was happening, he might have noticed that the towel was a little too pristine to have been used.

Izuku did arch an eyebrow as he sniffed the air.

"Perfume? I didn't think Uraraka used that..." he pondered aloud as he reached for the bait. Unaware of the hunter stalking him from the shadows above.

Izuku grabbed the towel and dried off his face, but grimaced as he felt the sweat beneath his suit. He hesitated for a moment before taking his top off and setting it over a chair, where he then proceeded to try and dry off some more.

Izuku froze though, as he suddenly felt like a rabbit caught in the gaze of a hungry wolf. He then felt hot and moist air against the nape of his neck, making his hairs stand on end.

Then he smelled it.

Hidden beneath the perfume, was that wonderful, amazing small from before, and it made Izuku's eyes shot wide in fear as his arousal suddenly spiked from the close proximity to it source.

"Got you Deku~" Uraraka whispered behind him and Izuku paled as he realized he walked right into her trap.

"Shit!" was all he managed to say, before a pair of arms and legs suddenly wrapped ground him and put him into a headlock. The pads of her fingers pressing down on him and taking away gravity, making him float up in her grasp.