The yellow flash of jujutsu high

Time skip.

Keitaro was seen looking a bit confused, Satoru had dragged him into the Gojo clan library, seeing so many white hair individuals was not a first, they seemed pretty nice.

Though he knew that niceness was probably fake, for one, he was the best friend of their clan head and for second, he was the main supplier of the pills to them so that was to be expected.

Satoru pressed his hand on a bookshelf which opened to reveal a secret passageway, he followed his friend down the passageway and just admired the secret passageway.

The seals placed all over it were quite impressive; he might replicate them for research purposes.

Eventually, they arrived infront of a gate, Satoru opened the gate and walked in.

"I am sure the book over there" The sorcerer was heard saying before he passed his hand through several books.

"Found it," he said before tossing Keitaro a few books.

Keitaro wore a confused expression, wondering about the books and why his friend had given them to him.

As he looked down at the book that was given to him, his answer came to him, the title of the book practically told him what the book was going to be about.

"Cursed Energy Techniques for Sterilization: How to Avoid Unwanted Consequences."

He opened the first page and just skimmed through the first couple of paragraphs, oh wow, something like this existed, for real.

His face was a deep crimson color, he did not believe what kind of book was in his hand right now.

The better question was how the fuck did Satoru know a book like that existed and why the heck did the Gojo clan have it down there.

"Uh... Satoru, why... why do you have *this* kind of book?" Satoru who was by now relaxing on a nearby chair had an amused grin on his face.

"The Big 3 families have been around for a long, long time, my friend. Plenty of their members just wanted to have fun without dealing with the consequences of having a kid," he explained quite casually as if this was nothing too important.

As if it was the most obvious thing in the world. "So they came up with ways to... you know, keep things under control."

The blush on Keitaro's face deepened even further. Why the heck would he be given those books."Right... but why give *me* these books?"

Why in the fuck would his friend give him those books, as far as he knew he didnt need them...

Satoru eyes sparkled mischievously, he slowly turned his head to face Keitaro, his expression deadpan as he gave him a classic." are you serious right now?" face

"Come on, Keitaro. You live with Shoko. I figured you'd need it."

Keitaro's blush deepened as he stammered, "It's... it's not like that!"

"Yeah sure and that Hickey on your neck just spawned there," Satoru said with a smirk on his face.

Keitaro sighed a bit, he was not winning this fight no matter how he sliced it.

Keitaro sighed, how bad could the book be....he decided to give it a chance.

He hoped he didnt regret it.

The first section broke it down step by step:

"By channeling curse energy directly into the reproductive organs, the user can disrupt the function of sperm cells temporarily, rendering them inert. This process must be performed with precise control, as too much energy could lead to irreversible damage, while too little would result in ineffective sterilization."

The fuck, why was it so descriptive, how many people have tried this shit out.

Nevertheless, he was curious so he decided to go on.

He continued reading:

"While the technique does not affect the user's fertility long-term, it requires periodic reinforcement, especially after the curse energy dissipates post-intimacy. Experts recommend practicing on non-essential tissue first to gauge energy control."

.....

....

If he was being correct which he was sure he was, was this book asking him to nut in a tissue?

He could understand needing to test it out beforehand but dam, plan B existed for a reason, though he guessed the sorcerer back then didnt necessarily have a plan B.

They probably punched any pregnant women until they had a miscarriage or something like that.

"Who the heck made this?"

He said utterly confused

Satoru shrugged, still leaning back casually. "Probably some genius with way too much time on their hands. But hey, you can't argue with results. The big families have been passing this knowledge down for generations."

"Plan B exists for a reason...." He said dryly.

"Old head, prefer the traditional way of doing stuff" Satoru added.

Oh, that was why.

Keitaro feeling tired of the first book looked around the room, his gaze eventually fell on the book in the middle of the room with no cover as if it was left there by someone....

It felt like bait.....

"What's this one about?" he asked, glancing at Satoru. If it was meant for him then he would bite, his curiosity was just too great.

Satoru grinned mischievously, an almost Devilish glint in his eyes. Why the fuck did he feel like he was being set up "Oh, that one? Why don't you take a look for yourself?"

This scream was a trap, deep down he knew that it was a trap, and his friend was probably trying to set him up.

However he was just too curious, it was just a part of him that he hadn't learned to repress yet and the book was sitting right there.

He walked over to the book with no cover and opened the first page, what could possibly go wrong?

The first paragraph read:

"Her breath hitched as his fingertips traced along the curve of her neck, leaving a trail of warmth and electricity in their wake. Every touch was deliberate, every move a slow burn that set her nerves on fire. His lips hovered inches from her ear, sending a shiver down her spine as he whispered promises that made her heart race faster than she thought possible."

....

...

Something didnt feel right....

Was this perhaps...

"She gasped as his hands roamed lower, the heat between them growing unbearable with every passing second. Their bodies seemed to meld together, as though the very air around them had thickened, making it hard to breathe. His lips captured hers, a deep, desperate kiss that spoke of unspoken desires they had both kept hidden for too long."

No, this was 100% smut, the fuck was that doing here, on the first fucking page of the book...Really.

Welp, he read 2 paragraphs and might as well read the third one.

"He pressed her against the wall, the cool surface doing little to ease the fire blazing between them. Their clothes, mere barriers that needed to be shed, clung to them like second skins. His touch, now rougher, more urgent, sent waves of pleasure coursing through her, making her body tremble with need."

Nope, nope, nope.

He was not going to read more, he slammed the book shut and just placed it where he had found it, he was not going to read that stuff.

Satoru burst out laughing...

"Hahahaha, you should have seen your face, precious" The 'strongest' sorcerer of the modern age was on the floor dying of laughter as Keitaro just looked very embarrassed.

"You took the bait...hahaha"

Keitaro groaned, he was annoyed.

A/N.....

If the picture below rings any bells for the readers...that means I did give in to my urges.

Story cover was made by @5_stargold on Instagram, Twitter, and Bluesky.