Chapter 1

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My eyes snap open and I jolt up in bed, breathing heavily, my body in a cold sweat.

Holy freaking heck. That was intense.

Suddenly, my body apparently remembers I just woke up, so I go from being wide awake to feeling groggy as one does when suffering jetlag.

Yawning, I slip out of bed and make my way downstairs to the kitchen, where I find Spike and Twilight setting the table for breakfast.

There’s two plates, a cup of coffee in front of each, with what looks like French toast and a glass of apple juice in front of a plate with rubies.

“Morning, Deku,” Spike says, looking to me as he moves to sit down, before pausing, his expression seeming puzzled.

I yawn loudly, saying “Morning,” as I do.

Twilight pauses where she is, several jars of spreads held in her magic. “Um… don’t your species prefer to be wearing clothing, even if only a little bit of clothing?”

I look at her in confusion. “Yeah. Your point?”

She indicates down my body with her eyes.

Confused, I look down… so see my boobs… in clear view... along with the rest of me... completely naked.

There’s a long pause, before my face goes bright red and I rush back to the bedroom, hastily grabbing my Hero Costume, before looking down at myself.

Sniffing, I winch, deciding to head for the bathroom for a shower.

With how exhausted I’d been after Pinkie’s Welcome Party, I’d been too tired to shower and just gone to bed.

Odd that I was tired, yet being naked in bed was enough to make it harder to sleep. Why didn’t I just shower anyway?

Shaking my head, I call out to Twilight that I’m just taking a quick shower, before stepping under the water.

The warm water immediately makes my body release tension I hadn’t even realized I was feeling.

It takes a bit of courage, but I eventually get to cleaning myself.

Washing my hair isn’t too tricky, almost second nature. Did I let my hair grow long normally back home?

It’s hard to remember. Ever since I found myself in Deku’s granddaughter’s body, recalling my own memories has been… spotty, at best.

I can vaguely remember things, but very vaguely, almost like they were I dream I have to struggle to remember.

Either way, the hair isn’t what I have to use courage for… it’s the rest of me.

Washing my breasts makes me feel incredibly self-conscious.

Not only is it such a different sensation from washing yourself as a man, but I can’t ignore the fact this is the body of Deku’s granddaughter, not mine.

I keep feeling like I’m doing something illegal here, even if I’m the one physically in control of the body.

Once I’ve finished, I get out, steam filling the room.

As I dry myself off, it’s impossible not to notice myself in the full length mirror on the wall.

I look… good. Like, really good.

I didn’t really give my body a good look when I went to bed and I’d been wearing the Hero Costume all day, so never actually seen the body itself, the costume actually kinda hiding how my body really looks, a lot like most of Izuku’s clothes did in the show.

Now, though, I’m getting a clear view, and it’s impressive.

Sure, there’s the thing any guy interested in girls would notice, the boob size, they look about as big as Uraraka’s do in the anime.

But, that’s not what draws my attention the most.

For a girl, Deku’s granddaughter is pretty jacked.

She’s nowhere near the level of, say, Gran Torino in his prime, but, damn, she’s buff.

If I had to make a comparison, looking at the muscles on this body is like looking at a mini Nana Shimura’s, if a tiny bit more muscular.

I try flexing, looking my reflection over.

I smirk. “Damn. Not bad.”

After a few moments, I realize what I’m doing, blush and rush to the bedroom, hurriedly putting my sports bra, panties and Hero Costume back on.

As I do, however, I notice something I hadn’t before, back when I thought I was just a female version of Deku. My costume isn’t the same as his from season five onwards.

It’s similar, but I can tell there isn’t as much of a focus on the legs as Deku’s was after season three, where he started using shoot style.

The gloves aren’t even designed for the wind pressure attacks he developed. They look the same as before he made Shoot Style. And the cape/scarf from the war arc is not included.

I guess Nana wanted to mixed the two types of fighting styles Deku used together to make her own?

I walk back into the kitchen a few minutes later, one arm wrapped around the other, my face still red with embarrassment.

We all sit down and have breakfast, not saying anything at first.

After a while, though, Twilight speaks up. “I hope you don’t mind, but, Princess Celestia got back to us this morning.”

I glance to her, toast still hanging in my mouth.

“She wants you to come with us to Canterlot today, immediately,” Twilight continues.

I break off my bite of toast and chew, nodding. Makes sense.

Luna probably informed her a bit in on what happened last night, so Celestia would understandably be concerned.

We finish breakfast, wash up and then catch the first train to Canterlot.

Less than two hours later, we’re walking through Canterlot Castle towards the throne room.

The guards escorting us keep glancing at me, their eyes filled with mixtures of trepidation, interest and bewilderment.

We walk into the throne room, the guards leaving.

Princess Celestia is sitting atop her throne, Luna standing beside her, the former… with a none too pleased look.

I got a bad feeling about this.

We walk up to the throne, the three of us bowing.

“Your Highness,” Spike and Twilight say with respectful tones.

“Princess Celestia,” I say, keeping my tone just as respectful, doing my best to hide the worry her expression fills me with.

Celestia and Luna share a glance, before the elder sister speaks. “My sister has informed me your name is Nana Midoriya, correct?”

I nod, lifting my head. “But, if you would be so kind, Your Highness, please call me Deku. Being referred to as Nana feels… weird.”

The white Alicorn just watches me for a few moments, before nodding. “Very well, Deku, if you would prefer. I wish to know why you are here, in my kingdom.”

I can’t help feeling confused. Didn’t Princess Luna explain that bit?

Clearly my throat, I decide to answer anyway.

“To start, Princess, I am not truly Nana Midoriya. This body is indeed hers,” I hold my arms out for emphasis, “but my spirit is not. I’m… afraid I cannot say who I once was, as my memories have become… fractured, I guess is the best word for it, since I found myself in Nana’s body.”

Celestia looks to her sister as if in answer to something, nodding, before returning her gaze to me.

Was she making sure I didn’t contradict what Luna had told her? Was she simply testing me?

“I have also been told you possess an incredible power called a... Quirk, if I am right?” she cocks an eyebrow at me. “Just how powerful are you? What is the extent of that power? And for what do you plan to do with it?”

I think about her questions very carefully, before being just as delicate with my answers.

“In truth, Princess Celestia, I do not know the extent of how powerful I am,” I put a hand over my chest. “This body is not my own, so I do not know how far in her training Nana was before she meant to come to Equestria. My only information about her, well, my Quirk now is what I know from her grandfather, Izuku Midoriya, the first Deku.”

“And the extent of his power?” Celestia asks, her tone firmly.

I gulp. One For All or not, if she gets pissed off enough, I don’t think one million percent would even be enough to save me from her wrath.

Taking a deep breath, I go over what I can remember from MHA in my head.

“Last time I checked, her grandfather could only handle a maximum of 20% of One For All’s power output. He also had awakened one of the Quirks within One For All, Blackwhip.”

“And Blackwhip is…?” her tone keeps setting off my flight or fight response, neither of which I know would help me in this situation if it comes down to it.

I gulp. “W-w-w-well,” I stutter, fiddling with my fingers, “B-B-Blackwhip is basically a catching and ensnaring Quirk. It produces energy tendrils from any part of the body and the user can command them at will. It can also be used to manoeuvre in a confined space. It’s a Quirk that, i-if I remember correctly, is powered by emotions, primarily anger, meaning the greater the anger, the stronger the Quirk becomes.”

Celestia’s eyes narrow, causing my blood to chill. “So, if you were to get angry enough, that Blackwhip would be a danger to my ponies?”

Shit! Shit, shit, shit, SHIT!

I wave my arms frantically. “I-I-I-I swear, I’d never intend to harm any of your subjects, in any sense, Princess! I-I don’t even known if Nana has awakened that Quirk yet. It could even be possible only Deku was able to pull it off. Once One For All was passed to Nana’s father and then her, it could very well have just gone back to being an energy stockpiling Quirk and nothing more!”

Celestia stands up, causing me to wince and Twilight and Spike to look nervous.

The white Alicorn’s horn glows with a golden light and a dome of the same colour forms around me.

As I glance around, scared shitless as to what’s about to happen, Celestia speaks, her tone cold. “Use your power.”

I look to her, confused. What?

“Use your Quirk, Nana Midoriya,” she orders, her eyes fixed firmly on me. “Show me you can control this power you claim to have. If you cannot, or will not, I must view you as an immediate threat to my country and my subjects.”

“Princess, this is going to far!” Twilight cries out, but her calls fall on deaf ears as Celestia doesn’t break her gaze.

I shudder. “B-but, I don’t know how strong this body really is. I don’t know if Nana even trained enough for more than 8%. Just because my last knowledge of Deku was 20%, it doesn’t mean Nana is at the same level!”

Celestia’s horn glows a bit brighter… and the dome starts to shrink!

Looking around frantically, I glance down… and realize the dome isn’t under me. Celestia only limited it to the air around me, not below my feet.

I have no idea if I could break a magical barrier, even at 100%, but a marble floor?

Even 1% could probably do that.

Doing my best to calm my breathing, I do my best to remember what I did back when I first got to Equestria.

At once, I feel that warmth moving through my body again, hearing small sparking sounds. However, I decide to make it a little hotter than last time, just in case.

“Okay,” I say firmly, pulling a fist back and swing at the floor. “One For All: Full Cowling, 5%!”

The energy output is instant. I feel the force of my punch quickly pass through the marble, the backwind almost sending me flying backwards into the dome.

The floor cracks instantly, crumbling away like wet tissue paper, a hole rapidly expanding the area within the dome.

The spark of joy I feel is short lived, though, as a golden glow quickly covers the hole, stopping me from falling through.

Looking up frantically, I see Celestia is now scowling.

Now I’m slightly pissed. What’s this even for? Why’s Celestia putting me through this?

Looking around at the ever shrinking dome, I decide, since she cut off the only opening it could give myself, I’m going to have to break the barrier.

I try again, this time letting the heat increase further. I do so until I suddenly feel a slight strain.

That’s my limit. Just wish I knew what percentage it was. I’d guessed 5%, mostly saying it in hopes it could make Celestia stop when she saw what merely 5% could do, but I don’t know for sure.

Since it’s my limit, I’m going to guess 20%, since that’s Deku’s max by the first half of season five.

“Alright, Princess!” I shout, glaring at her, blue electricity crackling around me. “You wanna see my power? You got it. One For All: Full Cowling, 20%!”

I thrust my arm forward. The wind pressure immediately rush outward, bouncing around with immense force throughout the dome.

It’s a struggle just to stay standing in what I bet standing in a hurricane would feel like, but I do my best.

The dome doesn’t break, however and continues to shrink, the amount of room left less than a few feet.

My survival instincts are going off like mad. If this doesn’t stop soon, this dome will crush me.

But, I can’t risk using any more power than 20%. The slight pain I felt proves that’s my body’s limit. Going any higher now would be too risky, especially since Recovery Girl doesn’t exist in this universe and I doubt healing magic would do us good a job.

“Princess, please, stop!” Twilight’s voice yells from somewhere, but I’m too focused on my approaching death to care.

After another minute, the dome barely giving me any room to move, I make up my mind.

Screw it. It’s go for broke. Either I use 100%, or I’ll be crushed to death.

I want to believe Celestia would stop this before that happens, this being Celestia, but I don’t know how much I can truly trust that. The way she’s been looking at me isn’t a look she often wore in the show and, the few times she did, it didn’t end well.

I clench my fists, getting into a stance and focus.

I imagine One For All like a pot at the most highest boiling point on the stove. Up til now, I’d been slightly lifting the lid, letting small amounts of heat out.

Now, I’m just taking the lid off all together, releasing all that pent up heat in one moment.

At once, my body is wracked with pain. It feels like every cell in my body is literally on fire.

The wind pressure around me is beyond intense. I can’t even think of a word to describe it.

Struggling to keep my eyes open through the pain surging throughout my entire being, I look to Celestia through the dome. Her expression has changed. She looks worried.

Suddenly, a thought just appears in my head. I don’t know where it comes from, but I trust it.

Pulling back my fist, I scream from the top of my lungs, “SMASH!”

What happens next is honestly a blur.

I hear the sound of a massive explosion, screams of fear and confusion, feeling something warm held tightly in my arms… then everything goes black.

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As consciousness returns to me, I’m aware of a soft, comfortable mattress beneath me.

Was… was all of that… just a dream?

A quick shift of my body causing my naked breasts to rub against the cover, sending a jolt through my body and getting rid of any grogginess.

Nope. Definitely not a dream.

Sitting up, making sure to keep the covers over my body, I look around.

I’ve been in hospital a few times, so I know a hospital wing when I see one.

Why am I…?

Suddenly, I remember.

The magical dome, going 100% and… nothing.

I must’ve blacked out after using One For All at full power.

Letting the covers fall, I quickly look myself over… only to feel confused.

I don’t feel… anything. Not one bit of pain, nor do I see any sign of scaring. Even my legs, where I’d assume most of my power went, since the Shot Style legs of my outfit is near identical to Deku’s, aren’t even scared.

Did… I actually go 100% or just imagine that part? Did I subconsciously stop myself going all out, even when I’d decided to do so?

The sound of a door opening makes me look up to see a unicorn stallion walk in. his fur’s grey, his mane and tail brown and his eyes, behind rimmed spectacles, are blue.

I can’t make out his Cutie Mark due to his coat covering it just enough to obscure it from view.

He seems to notice me staring and smiles, looking behind him. “Nurse, inform the princesses she’s awake.” He turns back to me, before looking away, a slight blush forming. “Miss Deku, even if you’re proud of your child, please cover your teats.”

Confused by his words, I glance down to realize my chest has been bare for probably a while now.

At once, my face goes red and I pull the covers over my chest, glaring at him. “I’m not pregnant, you jerk! This is just how big they are naturally! And I would cover them if I had my bra! Why the hell am I nude?!”

Not long after (once a nurse provides me with at least my sports-bra), Celestia, Luna, Twilight and Spike arrive.

The solar monarch immediately starts apologizing, explaining how she’d wanted to test how I’d react. Given the power she told I held, she’d worried I’d just try and destroy the castle to get away after my first attempts to get out of the dome failed.

And, by going 100%, I did indeed destroy a good amount of the castle, mostly just the throne room and nearby corridors.

However, I’d apparently blacked out by that point, but didn’t actually pass out completely.

Understandably, with a part of the castle just suddenly collapsing, many ponies couldn’t get away and had started falling.

As if on instinct, I’d apparently used Shoot Style, judging by the way they describe it, and saved literally everypony in the castle, getting them all to safety.

It was only once everypony was safe and outside the collapsed area of the castle that I’d passed out, hissing in pain despite no longer being conscious.

As the doctors and nurses had removed my costume to treat my wounds… something odd happened, though.

When they’d removed my clothing, my arms and legs were in a bad state. They were red raw, with no skin seemingly left on them.

However, just as they’d started to attempt to treat my injuries, my whole body had glowed with a yellow light.

Worried, they hadn’t done anything and just watched on. As they did so, slowly, my skin grew back and my injuries healed. It took almost a whole day, but, once the light faded, I looked like I hadn’t been injured at all.

“That… doesn’t make sense,” I say once everything’s been explained. “One For All doesn’t heal the user’s body. That’s not part of it.”

“Regardless, it is what happened,” Luna says, a small smirk on her lips. “It would seem you have more to learn about your Quirk than you thought, Deku.”

I nod, looking down to my left hand and clenching it. It would appear I do.

“Again, I must apologize, Deku,” Celestia says, her expression practically pleading. “After Luna explained what she could gathered about the League of Villains, I feared you could’ve been part of them, pretending to be a good soul in Nana Midoriya’s body.”

I cock an eyebrow. “Come again?”

“Despite my assurances, my sister was worried there may have been more to that soul removing Quirk we observed in your dream memory,” Luna says. “She thought, if a soul had replaced Nana Midoriya’s not long after her soul was removed, could it have been a Quirk that transfers a soul? One that kicks the soul out of one body to take its place?”

I shudder. Actually, that’s a disturbingly possible idea. I know about Quirks that feed off others’ life energy, so a Soul Replacing Quirks isn’t too unbelievable.

Heck, isn’t that kind of what All For One’s Quirk did to Shigaraki, letting All For One essentially take over Shigaraki’s body?

“I feared, after what my sister said, you could’ve been that Mo-na-ma person, now in control of that body,” Celestia continues, her having to sound out Monama’s name in order to say it properly. “However, when the area of the castle started collapsing, your instinct to save everypony told me you couldn’t just be putting on an act. You are a good soul.”

I nod, before frowning. Something just mentioned is nagging at my brain.

It takes a moment, before my eyes widen as it dawns on me and I look to the four of them, my eyes wide with fear. “The League of Villains! They’re here, in Equestria!”

Luna holds up a hoof. “Yes, Deku. We are aware.”

I pause in my panic, looking to her in confusion. “And, you’re not worried because…?”

“Oh, we’re worried,” Luna says bluntly. “Absolutely fucking petrified.”

I blank. Okay. Did not expected that exact sentence to come out of Luna’s mouth.

Celestia gives her sister a disapproving look, before turning back to me. “It’s true. Luna has already told me about the League of Villains. We have scout teams already out looking for them and messages are being sent across the land. If anypony or creature notices beings of a similar appearance to yourself, they are to inform us immediately and maintain their distance. We don’t know what Quirks the League will have at their disposal or how many.”

“I… don’t suppose you could help clear that up a bit?” Twilight asks hopefully.

I just shake my head. “I have no clue who this League of Villains is. Since Midoriya was old enough to have a grandchild, chances are, this is a completely different League of Villains from the one I know. There’s no telling what personalities and Quirks they have. I don’t even know how long they’ve been in Equestria. The memory I have of Nana’s last moments suggests a bit of time had passed since the League went through the warp Nana tried to go through, so they could’ve been here for a whole year for all I know.”

They all sigh dejectedly, before Twilight smiles at me. “Well, in the meantime, Princess Celestia has suggested you stay in Ponyville. There, you’ll have plenty of open spaces to practice improving your Quirk until we need it. I’m pretty sure you intended to fight the League if we find them, no matter if we tried to stop you or not.”

I nod. “You’re damn right. This wasn’t my fight, but the League made it mine when their actions put me in this body. I wasn’t one to back down from bullies before, so why would I now? And… wait,” I blink. “How do I remember that?”

My eyes widen as I suddenly realize, I can remember my past.

I mean, not entirely. Like, I don’t remember my old name, exactly how old I was, names or faces from my past, but I can remember other things, like places I’d been, things I’d done, the people I knew even without names or faces.

This is weird.

“From what I’ve gathered, using 100% of your power so suddenly may have triggered something within you,” Twilight says, though sounding a little bit unsure. “I’m not completely sure, but, maybe One For All, as you call it, helped link some synapses in your brain after you overused it.”

“Like how you can find pieces of food floating in dirty pots after filling them with too much water too fast,” Spike interjects.

Thanks for the not so pleasant example, there, my scaly friend.

“Anyway, if you wish to test your progress during your time here, I believe Zecora could use help keeping the monsters of the Everfree from running too wild,” Luna adds. “Not long ago she sent a warning to the courts, saying the monsters are getting a bit more restless since the Elements were returned to the Tree of Harmony. We’d been trying to figure out the best way to handle such a situation… and now one seems to have just plopped itself in front of us,” she indicates to me.

I grin. Fighting the monsters of the Everfree to improve my abilities? Sounds fun.

Not long after, they leave so I can get some more rest, Twilight saying she has a surprise for me tomorrow, should the doctor say I’m free to leave.

As I lay down, trying to get some sleep… I can’t help being worried.

The League of Villains have been hiding in Equestria for I have no idea how long. There’s no telling what they could be planning in a world full of magic. Not to mention…

I lift a hand, frowning at it. Why did my body seemingly heal itself? My Quirk shouldn’t be able to do that.

I’m worried what this could mean for One For All.

Could it be something to do with Equestria itself? Was the magic of this world changing One For All? Or is it that Quirk Hatsume said was forced on Nana?

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A biped figure stood in the shadows of the trees of the Everfree Forest, looking out towards Ponyville, smirking.

It would be so easy to make these worthless creatures suffer… but this wasn’t the time.

Now that they’d found the portal to the human mirror world, they could put their plans into motion, building their names and changing the world to meet their design.

And, this time, there were no heroes to stop them.

Author's Note

Strange how some days can just make you wanna write.

Maybe i just wanted to have Deku set up for living in Equestria, maybe i wanted to plant some early hints i couldn't let chapter.

regardless, i ended up spending most of my birthday writing this, so i hope it turned out alright.

I guess, one reason i wanted to write this was to establish how the MC was going to be addressed in the future, as well as a few other things here and there, along with dropping a few hints for future revelations.

also hope my righting of Celestia didn't feel too OOC. Considering it isn't too far off from when the Changeling Invasion happened, i'd think Celestia cautiousness would make sense, but i could be wrong and it could just ocme off OOC.

i really just don't know.

Anyway, it's after 3pm and i'd like to get this published so i can try to really enjoy the rest of my birthday.

Hope this chapter was satisfactory and, til next time, stay safe, stay clean and see you later everybody.