It's Common Sense That a Mother Gives Sex Education When Her Son Becomes an Adult
She came in, all right.
Entranced by that beauty of hers, she stepped into my room.
True to its status as the Emperor's bedchamber, it was lavish beyond measure. Blinding gold leaf everywhere was the bare minimum; the bed was swathed in luxurious silk, and the mattress was stuffed so densely you could feel how soft it would be before you even lay down.
Among all that splendor, Valeria—once my wife, now my mama—settled demurely on the edge of the bed first. She carried herself like she had something weighty to say, so I sat down beside her.
"Haaaaaah……"
Valeria let out a sigh so deep it could have cracked the floor.
When I asked why she was lamenting as if the earth itself were collapsing,
"Because of you, of course, Otto!"
"M-me?"
I wondered what crime I could possibly have committed. The coronation had gone off without a hitch. Maybe the previous owner of this body had pulled some stunt I didn't know about?
"I am genuinely speechless… Do you truly not know what you've done wrong?"
"No, Your Majesty, I really don't."
At that, Valeria's face flushed crimson. She muttered under her breath, Becoming Emperor and still managing to shame this mother of yours…, then snapped,
"What else could it be?! You're a proper adult now—an Emperor who's already held his coronation! At this point you ought to be able to handle a little jerking off on your own like a man!"
"…………Excuse me?"
The shock hit like a bolt of lightning straight through my skull.
Valeria—who looked elegant enough to breakfast on morning dew alone. A beauty who possessed not only grace but genuine dignity—had just uttered the vulgar word jerking off, and something like a massive temple bell started clanging inside my head. Who would have guessed such filth could come out of a face like that?
And the next line hit even harder.
"Otto the Second! Confess before the gods this instant. Is it true that you still have no experience with a woman?"
"E-excuse me…?"
"Are you really going to play dumb until the end? Listen. If a son reaches his coming-of-age ceremony without ever having been with a woman, it is this mama's duty to personally provide him with sex education!"
"……What?"
Was this for real?
This was the fantasy world I had created. Sure, I had made it as unhinged as possible for the sake of entertainment… but I had completely forgotten about this.
"I am genuinely at a loss for words…! You truly didn't know? This is a solemn law proclaimed by the ancestors of House Heim. I am a member of House Heim now myself, and even an Emperor is by no means exempt."
I was stunned. That such a law could exist. That such a magnificent, progressive culture could exist!
This was the world I had built. But I had touched so many parts of it, and so many of the laws had been slapped together on a whim for the sake of a good time, that I couldn't remember them all one by one.
Was this… a revision I made to weed out whether my descendants were gay or not?
This coronation had doubled as my coming-of-age ceremony. After the previous Emperor died, Valeria had briefly served as regent, tidying up the council and domestic affairs, then timed the transfer of the crown to the moment I became an adult.
Anyway. I had no idea when I had written this insane law, but—
"Then, Mama…?"
"……♥"
The perfect scenario was already painting itself in my mind.
Valeria didn't waste another second. As if she had finally accepted reality, she moved with the air of a mother who had simply given up in front of her own child.
Click…
She undid the brooch resting on the shoulder strap of her pure-white robe—a garment that suited her far too well.
Slip…
Obeying the beautiful law of gravity, the beautiful white fabric slid down. And there it was: skin of flawless white jade that, until now, only a single man in her entire life had ever been allowed to see. Skin so exquisite that even a goddess secretly watching would have forgotten jealousy and simply gone slack-jawed.
The deep, elegant line of her collarbones. My gaze traced those perfectly placed bones, then traveled lower—and stopped at the swelling mountains of her chest.
…There's no mosaic.
They were so obscenely large they absolutely should have been censored. Beautiful, heavy arcs that rose into plump peaks designed to stoke a man's lust—tits that practically screamed grab them with both hands and knead. The quarter-elven blood in her veins was on full display in that skin; it begged to be stroked.
Lower still, a neat little navel nestled in a soft hollow. I wanted to look even further down, but a golden sash still cinched the robe at her waist.
She's walking pornography with legs…
"D-don't stare quite so hard…♥"
Even at this level alone, my blood was pounding hard enough to give me a fatal case of hypertension.
Valeria. Once my lawful wife, the woman I had loved more than anyone while I was still Otto and roaming every corner of this world. Now, after entering her son's body, my one and only mama. Thanks to the elven blood flowing through her, she possessed a beauty that would last nearly a lifetime—four characters that would shine forever.
"O-Otto… this is your punishment for not taking a woman even before becoming an adult."
Valeria turned her upper body toward me. Both of those beautifully balanced breasts were now fully exposed before her son. She spread her arms in a clumsy invitation and issued her next command.
"Suck on this mama's breasts right now. Learn just how important a woman is to a man."
"Mama… are you serious?"
"W-would I be joking in a situation like this?! H-hurry up! This is a punishment I'm giving you!"
"Mama!"
"……Nngh♥"
I tested the waters once—then lunged without a shred of restraint. I buried myself in Valeria's breasts, those breasts that felt like a blessing just to touch, filled both hands with the soft flesh of the woman who was now my mama, and suckled.
Slurp— sluuuuurp♥
"Nngh, nnngh…♡"
I sucked greedily. I coated them thick and glossy with my saliva right away, then treated them like they belonged to me, wrecking their shape according to pure male instinct.
Having offered her breasts to her own son, Valeria covered her mouth with the back of her right hand. She was trying to smother any moans while her son nursed at her chest—determined not to let a single sound escape. She stubbornly held out as if refusing to admit she felt anything under her grown son's hands, even as he bit and suckled and chewed on her tits.
Fuck, Mama's tits are so hot…!
On my end, dopamine was flooding so hard I could have died happy. To get to taste my original lawful wife again—the woman who had let me fuck her senseless and even given me a perfect heir—this time as her son! It was the happiest scenario imaginable. Every treasure in the world was right there in Valeria's breasts.
"Mmngh…♥ Nngh…!"
Valeria kept her moans crushed down behind a flushed face. Then, as if signaling that it was her turn next, she slipped a hand inside my robe.
Because of the coronation, I was also wearing traditional imperial dress. It was light fabric, so Valeria's hand wriggled and swam around underneath without much trouble. Her embarrassed face made it look like she was groping around searching for something, but there was no need.
Twitch!
"Hwah…!"
My cock had already risen on its own. Valeria hadn't managed to find it with her shy sidelong glances, but there was no mistaking the massive pillar that had surged up past my waist. Anyone looking would have sworn I'd grown an extra leg.
From the very start, this body had been improved by mixing genes from every direction—a monument to House Heim's long history of selective breeding. Valeria floundered. Whether she had never expected to see her fully grown son's raging erection right in front of her nose, or whether it was even more than she remembered from the last time she saw it, she turned her head away in vulgar shock.
"Honestly… after I gave birth to something this magnificent!"
"Mama…"
She was right. In the original game, you carefully screened and re-screened among your sons for the one who would inherit. First criterion: the child with the strongest territorial claim, the one with zero reason for the lands the ancestors had built to be taken away. Next: the child who was physically and genetically the finest specimen.
By that measure, Otto the Second was the perfect legitimate heir. Highest bloodline, fully worthy of inheriting the name of the previous era's legendary adventurer, "Otto."
Hoo… this kid came out with a real sweet potato attached. How thoughtful of him.
Even looking at it as the original father—now inhabiting this body myself—I felt proud. The cock I had just seen easily surpassed thirty centimeters. Not just the length; the girth was vicious enough that the moment it went in, it would turn any woman into a dedicated breeding vessel for the imperial bloodline. A cruel blunt weapon.
"Honestly… I can't live like this…"
Valeria grumbled as her hands busied themselves. While nursing her son with those enormous breasts, she stroked and fondled the thick sweet potato of the boy she had raised so well.
"Nngh?!"
She might have been complaining with her mouth, but her hands moved with the practiced skill of someone who had handled something similar before. An all-too-familiar touch. Almost as if she were feeling nostalgic, she gripped that massive cock without fear, squeezing and working it boldly.
"There, there—this is the spot that feels good, isn't it?"
"Th-there, Mama…!"
"When a woman shows her breasts, a man is supposed to suck them eagerly. And when a man shows his cock, a woman is obligated to serve it willingly without shame."
She said it as if it were the most natural common sense in this world. And she was truly skilled. It wasn't just mechanical stroking of a pillar; she stimulated the underside of the urethra, rubbed softly, then clamped down hard for pressure. Mama's technique melted me completely.
A world where you suck on Mama's huge tits while getting a handjob. I'm so happy I might ascend to heaven on coronation day. This country had its priorities straight.
"Mmm… making a man happy is… a woman's duty when she guards the home…"
Slurp, sluuuuurp♥
"Nngh… for someone who can stimulate a nipple that well… why on earth have you never been with a woman until now…♥"
Basking in heavenly pleasure, I let my hands wander further. I casually groped Valeria's thighs. I rubbed them obscenely so she would feel it, teasing close to that place without quite reaching it, flipping the robe aside and grinding between her thighs. Mama did her best to ignore it and kept her focus locked on my cock to the bitter end.
"Th-this should be enough, so hurry up and cum! By now you ought to know how to finish on your own."
"Mama, just a little more of Mama's delicious tits…"
"Quiet and c-cum already!"
She hastily swept her cascading hair aside, then declared,
"Sex education is no joke. Whether you can properly fulfill your role as a man—whether you can live as a gallant Emperor like your father—this mother has a duty to watch over you!"
"Nngh! Mama, Maaamaaa!"
Valeria squeezed my cock even tighter. She rubbed hard just beneath the head, then formed a tight ring with her fingers and tried to milk her son dry. I couldn't hold out there.
My first load of cum was almost too precious to waste, but those soft breasts felt too good, and her wrist technique was flawless. In the end I went all the way. My lower body trembled and shuddered like a volcano giving its warning signals before eruption—
SPURT!
"Eek?!"
SPURRRRT— SPURRRRT! Spurt, spurtrt! Spurt! Spurt!
An enormous volume erupted. With the grandeur of a real active volcano blowing its top, I admitted as her son that Mama's hand had made me feel so good I came. This was the result of maximizing House Heim's fertility. We had needed to breed faster and more, so the men born of Valeria's line had been improved to the point that a single round of sex could guarantee pregnancy.
That was why even Valeria, with her elven blood, had been able to conceive. Ordinarily, elves and humans could mate for years without a successful fertilization—but days of nonstop sex glued to Valeria's side had made it possible.
"Nngh… it's so sticky…"
I dirtied Valeria with that volume. The first sacrificial victim of my cum was none other than Mama Valeria. At the last moment I deliberately angled it, painting her thoroughly with her son's cock-juice. Easily enough to fill a large beaker. With a little exaggeration, enough to fill an 800-milliliter water bottle to the brim. A mad cum-tank sex-machine Emperor only possible in a fantasy world.
Twitch!
But it still wasn't enough. This body, with its fertility cranked to the absolute limit, treated that much as nothing more than an appetizer before the main course. My breeding drive wanted more.
I hurriedly reached for the golden sash around Valeria's cum-soaked waist—
Smack!
She struck the attempt away hard. The soft hands that had just been stroking her son's cock were gone; she slapped my hand away as if she meant it.
"M-Mama?"
I was thrown. The same Valeria who had been so diligently giving me sex education now flinched at my action, clutched her robe to her chest, and stood up.
"Just where do you think you're putting your hands on your mother?"
"E-excuse me?"
"Don't tell me… Otto the Second, you aren't in heat for this mama of yours, are you?!"
"Excuse me?!"
I was stunned—by the statement itself.
Fuck, she just showed me everything and even gave me a nursing handjob, and now she's suddenly talking like a normal person?!
Of course I was in heat. I was in heat for Mama, which was why my cock had risen and why I had given her a cum shower via external ejaculation.
But Valeria looked utterly appalled by my attitude. She suddenly clasped her hands in prayer, then looked down at me sitting there dazed with a gaze full of contempt.
"Please, don't you dare entertain such a horrific thought even in your dreams! Honestly… I've given you a proper education, so go wash up already! You're a perfectly healthy young man, so why would you…"
"E-excuse me?"
"If I see this kind of impure attitude again, I will report it to the gods—keep that in mind! ……Honestly, how shameful, right here in the palace!"
Valeria quickly fixed her clothes. Looking genuinely furious, she stomped her delicate feet—thump! thump!—and left the room first. The door slammed shut with a bang!
My mind went a little blank. I sat there dazed, replaying the last few minutes.
This was definitely the incest fantasy I had created. Originally it hadn't been that kind of game, but I had forced it, installed mods, and steered it until it became one. In this world, incest was common. Culturally and religiously, noble incest was permitted. Commoners couldn't, but among the nobility, siblings pairing off left and right was ordinary.
……Wait.
Something snagged. When I asked myself exactly how far I had allowed that feature, I couldn't remember precisely.
Marriage to a hot cousin? Possible. Marriage to a promiscuous old-maid aunt or a fierce paternal aunt? Possible. Half-sisters and even full-blooded sisters from the same womb? Possible.
In that case—
Damn it, did I set it so first-degree relatives are off-limits?!
Looking back, that was exactly it. I had fucked every race under the sun, even held a joint wedding with an aunt and my full sisters—but I had never once tried marriage between parent and child. I hadn't. There had been too much else to do, so I had skipped that one. That was why. That was why there was no data.
In this place, love between parent and child had been absolutely locked down.
Don't tell me… every other woman is fair game, but Valeria is completely unconquerable?
My mind went hazy. I didn't want to believe this reality. I had become the Emperor who ruled forty percent of the world's territory—someone who could do anything. And yet the woman I had loved most in my previous life, the one I had cherished enough to make my lawful wife and fucked raw over and over, was now permanently off-limits.
It was the worst. This was a living hell and a nightmare.