{Finally. The time has come.} Nana Shimura sat on a ledge of a building, her black and white world shifting both in color and imagery as the buildings vibrated and her skin became more lively; like she wasn't trapped within a world without color. Her plain black hair returned to its onyx color, her skin now a soft vanilla, and her costume having its original colors return.

She felt the buildings become more grounded to reality, the air no longer feeling like an endless wave, and her costume's fabric clung to her fit form, her nipples protruding as she happily thought of what Izuku would be able to do to her body.

Izuku felt his body floating in the blackness, the shadowy smog encapsulating everything around him. Soon, he felt the asphalt scraping at his feet as the fog attempted to lift. A cityscape surrounded him, now cloaked in the smog from mouth to toe.

'Ugh… where am I now?' he thought, trying to look around. It appeared to be the Korusan district of Tokyo proper, if a bit dated with the angled towers of business, and no sign of the Endeavor Agency in the middle of it all.

{"Took your sweet time getting here, huh Nine?"}

Izuku looked up to one of the nearby buildings to see a tall strong-looking woman looking down at him. As she slid off the corner of the ledge, Izuku instinctively rushed beneath her, but was surprised to see her gently float down, her stark white cape billowing in the smoky air. As insightful as before, he recognized the name coming to his mind as she became eye level with him. "Shimura Nana-san?"

The woman smiled confidently. {"That's right, Number Seven front and center, Nine."} Nana chuckled with her hands on her hips, her song gaze blending seamlessly with her oh-so familiar hairstyle. {"Gotta say, though,"} she licked her lips as a gloved finger stroked his covered jaw, and he could feel its pressure on his budding whiskers. The creeping sense of dread filled the young greenet. {"I honestly love what I.D. did to you. Can't wait to try out yo-"}

"There she is!" a voice sounded out, breaking the tension.

"I've got her." a gruff voice responded as Nana's body was suddenly wrapped in some sort of black energy tendrils.

"Damn it you old coots! Let me have thiiiiiiis!" the seventh wielder roared out as she was yanked away.

Izuku stood there as Nana was hauled over the edge of the nearest building, both relieved and concerned, until the city began to fade away.

"My… apologies, for that, Young Midoriya." a weathered voice said behind him. Turning around, Izuku saw a thin, lanky man with white hair looking up at him, a slightly glowing eye peering his gaze as the area shifted to an older style home, a table in between them. As the man sat down, Izuku felt his body begin to shrink, much to his great relief. When he assumed his shadowed form was back to his physical state before everything went screwy, he was now maybe a head taller than the man sitting on the floor in front of him. "Young Shimura has been… antsy, about you coming here, for reasons you can probably assume already."

Izuku said nothing as he sat down as well, but the cold sweat still persisted. Was this…

"I'm sure you've already guessed what I am." he stated casually.

'One for All...' his mind echoed. Questions started to reel in his head that he wanted to ask immediately, but his voice never came out.

"For simplicity's sake, you can refer to me as Ichirou." the spirit of One for All bowed his head as he set his palms on the table. "And you've been deserving of an explanation for what's happening to you and your… lovers."

Even though the misty face mask, the boy's blush glowed through.

"Young Yagi has already told you of my brother's rise to power, and my own rebellion against his ideology." Ichirou rambled, flashes of the past blinking around them that Izuku only just made out. "And when he forced the Stockpile Quirk onto me… well, it wasn't the only one he did."

Izuku felt the stretch of dread in the First's voice.

"One for All works similar to All for One, in that the Quirks taken in aren't immediately available. Unfortunately, neither of us realized that when he tested the Stockpile given." Ichirou gripped his shoulder in some phantom pain. "Believing that the Quirk was somehow nullified, he forced another on me, one that was more… recreational. One he stole from a westerner, granting others his preferences."

'That must be what's been happening.' Izuku thought. 'That second Quirk must be the cause of all this.'

"I've taken to calling it 'Ideal Desires', for it's altering effects. A simple Quirk, and it's best used for couples, but not even my brother could have seen what it could truly do…

"You see, Ideal Desires initially reconfigured the pituitary hormones to promote development based on the chromosomes available, a second puberty, one might say. Usually, this would just mean the Quirk would have access to the 46 present, with three Xs and the single Y."

The Ninth felt the gears in his head working. 'Usually? Shouldn't that mean normal- wait...' Izuku's curiosity shrunk his eyes. 'Stockpile Quirks reserve kinetic force and sometimes energy, but One for All does so over generations, building up the strength to face All for One… and he said Quirks taken… does that mean…!?'

"Your expression tells me you figured out part of the puzzle." Ichirou sighed with a sad smile. "One for All is indeed the sibling Quirk to All for One: the Quirks of your other six predecessors will manifest in time, but it's not just Quirks that come with my burden…

"Ideal Desires uses the Stockpile of One for All to retain the chromosome data, so the effects of physical changes are multiplied by the number of people who have been affected by I.D., and on top of that, One for All can only rein in the Quirk after it's run the course, which has always been after you've… spent separate company with the same number of people compared to how many successions One for All has gone through."

Izuku's eyes were so wide it was a surprise they hadn't fallen out yet. Not only had the other bearers dealt with this, but it had been getting crazier every generation! Even All Might had gone through -

"We were all honestly surprised when Young Yagi didn't act on any of the urges. A virgin, all this time. Especially with how… passionate Young Shimura was and is."

'...Eh?' Izuku froze as the words echoed around. Did…did he just say All Might was...

"Apparently, he has a preference for single mothers…"

'Oh my god...'

"...certainly didn't help him with Young Shimura…"

'All those rumors… debunked...'

"...granting him One for All by drinking her milk…"

'Well, at least those rumors of him and Sir Nighteye were completely wrong. Take that, FlaminHotWings003! Your Endeavor page is now and truly nixed!'

"...it was a surprise for me that she could do that as well..."

'Wait, did he say single mothers?' Izuku blinked and his irises became pinpricks. 'Is...Is All Might Interested In MOM!?'

Ichirou saw Izuku's head beginning to sway as his eyes started to spiral "Please sit, young one." The area changed from the old apartment to a somewhat small but modern living space with Izuku sitting on a black leather couch while Ichirou sat on a recliner facing the young teen.

"Would this be more comfortable?" The greenette nodded, his dazed expression lingering as he tried to figure out his surroundings.

"Wh...Where are we?" The room had a plain white wall with a dark oak table separating Izuku from the original One for All wielder. There appeared to be a door next to the couch but if it led anywhere, he didn't know. The floors were lined with a black carpet and the fan above them had what looked to be an old light attached to it. 'Where's the light switch?' Izuku wondered as Ichirou cleared his throat.

"Now, Young Shimura will be back soon, so I must tell you what I can about the practical benefits of Ideal Desires." Ichirou sighed again. "This was uncontrollable until you had laid with the number of lovers as many times as One for All has been passed on; in your case, nine. Now that you have, you can change yourself and your lovers to be more practical. But at the same time, neither you or your lover can change something about the other if it goes against anything they want."

Izuku felt a bit more relieved, the changes forced on the others could be reversed, and everything would go back to normal.

"Normal?" a voice barked from behind the door. "Kid, all that explosive abuse and self-deprecation really messed with your head if you think it'll be nice and peaceful from here on out."

Izuku saw Ichirou start to cover his face in exasperation as the door was kicked off the hinges. The figure stepped through the threshold to reveal Nana with an unnerving familiar smile on her face. A face he hadn't seen since before Kamino…

Much smoother and less crusty, though.

"Young Shimura..." Ichirou groaned as Nana loomed over Izuku, her opposite leg lifted over his shoulder in a sultry kabe-don. He could see she was already wet, somehow. Her costume was tight against her abs, and her hard nipples capped her approximate F-Cup wonders. Her moist pussy was fat and stuffy, womanly juices slowly dripping down her thick sculpted thigh. Ichirou knew that trying to tell the young man any more information while she was there was pretty much impossible at this point, especially when she's in that position. Izuku looked at him with scared eyes and all he could do was stand up and go to the door. "Please don't make too much noise…" he grumbled as he left the two of them alone.

A horny woman and an admittedly spooked boy.

Something Izuku never really considered, even before all of this madness.

"Mmmmm… Toshinori got a nice one." Nana licked her lips as she removed her gloves and started tracing her fingers over the ethereal mist covering his face before tearing it away like tissue paper. Izuku now could properly smell the sweat and gushing juices that were covering Nana's thighs. He audible gulped as he tried backing away, sinking deeper into the loveseat.

"W-Well I would have sex with y-you, but I don't know I'd be any good…" He looked at his normal scrawny self. "the way I am now. Here, in this place." Nana softly giggled and cupped his growing erection.

"Kiddo, even before this, you would have made any of those girls happy." She comforted as her grip tightened. "But if you feel that way, then why not use Ideal Desires to... remedy this situation, hmm?" He felt his muscles bulge as Nana held onto him, his head actually being engulfed by his ballooning form. "Mmmm… not bad, but we can go bigger." Her grip tightened on his shaft as he felt his bones lengthen until he was probably a head shorter than All Might, his bulk now looking more proportional, but still double his hero in size. "There we go… now let Momma Nana get this beast riled up." She squeezed tight and gave a hard twist at his base before his cock exploded in size to his original height before all this, but maybe three times girthier than his fist. "Now this is more like it~" Nana licked her lips and caressed Izuku's massive cock as she covered it in her saliva, extending her tongue to lick every crevasse of Izuku's vein-riddled member, cleaning it of smegma and dried sweat. She spun around the dick having her back to him and began growing her breasts against it, the firm pillows rubbing in tandem really riled him up.

"Ahhh… Shimura-Mmnmfff?!" He started to groan out before his mouth was invaded by her boot. He felt her leg retract while the boot remained and saw her looking back with a stern expression.

"That's Nana or Mistress, Nine." She glowered as she took off her other boot before running her toes over his abs.

It felt electric in this dream, and Izuku seized as his head arch back and crater the wall behind him; the shock of impact caused him to flinch. Looking forward saw Nana's unitard bunching up at the top of her thighs, shaping a lovely pair of sculpted ass cheeks. They looked stunning, and so firm, but strangely narrow for a mother.

That could easily be fixed.

His larger hands released their vice grip on the arms of the loveseat, tantalizingly reaching out in front of him to the fit goddess before him. His broad thumbs prodded the hem, but her body resisted, it's toned muscles defying cushion… for a moment.

Nana let out a squeal in her moan as her insides jostled while Ideal Desires did its magic. Even metaphysically, her hip bones cracked and broadened as her butt started to balloon. Izuku's hands grasped them tightly, his grip embracing each cheek wholly, until his fingers began spreading from the amount of ass fat coming out.

"Now we're getting somewhere, huh, cutie?" she teased, gyrating her still widening hips. Her sex was grinding at his base, the sopping juices dribbling down to his head-size balls that felt surprisingly smooth.

In fact, Izuku realized that aside from his head, his body felt like it had been waxed, so no hair was present.

"Not much of a fan of the gorilla look," Nana shrugged, kicking away Izuku's tree trunk arms and spinning around to face him. "I prefer my boys clean when I go down on them. Besides..." she teased as she thumbed the hem of her unitard holding back her now torso-dominating tits. "My girls here enjoy the smoothness, see?"

Izuku did see. Nana's boobs were bulging out past the seams, each twice the size of her head and a quick tug forced the fabric inward to pool in her vast cleavage, showing off her dark red areolae, small streams of white spurting out as they bounced, before continuing leaking steady.

"Mistress..." Izuku breathed, his hot gulps of air made her nipples pulse as more milk leaked out.

"Like 'em? Toshi did too. It's how I passed One for All to him." Nana's grin grew as his face went ketchup red. "And now you get to taste." she grabbed him at the base of his jawbone and pulled his head to her teats, cackling as she felt his breath reverberate in a muffled scream.

Gasping, Izuku was feeling her milk surge down his throat in rushing gulps. He only just remembered he was in some sort of mental scape and didn't have to breathe. The silky liquid was surprisingly savory as he lapped at the streams.

Outside of that, Nana's milk was making him think about Ideal Desires: Ideas, thoughts, possibilities, limitations. Everything that his predecessors had encountered with this Quirk; it all flowed into his mind with each spurt of milk. This newfound knowledge made his hands reach to her waist, thumbs prodding the abs, pressure causing her belly to begin to bloat with adipose, forming a musclegut.

"Ooo..." she cooed, feeling the rugged fingers molding her like clay. Nana missed this sensation; to be putty in a young man's hands, fulfilling his needs and her wants. "That's right, Nine. Make me like your girls outsi-EEEEEE!" she squealed as his cock bounced her off his lap onto the coffee table. The furniture groaned as she saw Izuku stand up and loom over her. Her torso covered the top of the table, and her full tits covered the lower half of vision, the rest being overshadowed by his massive appendage, but she teased her feet over his broad chest, grating abs, and phenomenal cock, just to feel her work.

Izuku's body felt exhausted, which was weird in itself being stuck in his head, but the sensations from these transformations surged in his brain and Nana's teasing was NOT helping. Looking down, he saw her chubby form, and it unnerved him how similar she looked to his mother, just taller, broader, and much more muscular. Even Ideal Desires hadn't taken away her muscles, which Izuku was thankful for, her thickened form was just softly layered fat over them, making her skin ripple with each teasing movement. Said movement added pressure as Nana kicked off his chest and her body began to float off the table, quickly righting herself to loom over him again.

"Hmmm..." she smirked, feeling her fat-covered abs, still pinching to shape her six-pack. "Not bad for a second attempt, Nine. So let's..." she straddled his pulsing cock, her pussy spread to invite his glans in as she teased it. "Go for broke, m'kay?"

The young hero suddenly felt his dick be jammed into the older woman, pressing onwards and inwards like the wringing of a sponge. At the same time, her hands grabbed at his pectorals as the oh-so familiar tingling spread throughout him, and his skin began to groan. His peripheral vision was slowly but surely being filled with even more muscle as Nana's gaze grew more manic. Her insides stretched over his still-growing cock, yet remained tighter than a vice. His arms were forced to spread out as his body continued to swell, and his shoulders hit the ceiling before his head had, and Izuku realized he was growing at a faster rate than the week, by a WHOLE lot. The room was getting smaller and smaller to the both of them, and Nana was reveling in it.

"Fuuuuuck yeeeeesssss, Nine!" she screamed as the walls buckled under Izuku's relaxed fists, now as thick as tanker trucks with arms like sequoias. He was becoming a total brute as Nana was thickening as well, her tits now as big as he was as she continued hopping on his dick, ass clapping at each thrust. "Fuck me boy! Be a motherfucker and sate this cougar you've brought out of her cage!"

Izuku had become numb to her words - and everything else, really - as the room tore apart as they both grew phenomenal in size, neither could see anything other than their own respective flesh, their innards flaring as Izuku felt his balls lurch and swell as Nana's inner walls tightened and began to sop with her juices. And in that final sense of clarity, he felt them both release, and everything went white.