The Redhead Perfection (1)

"Could you keep your hands to yourself?" A sharp voice berated Kai but... damn that voice! If he COULD keep his hands to himself, he would. Since he COULDN'T, he didn't. Letting out an exhausted sigh and keeping her giddiness to herself, not knowing that the monster constantly fondling her ass through the thin layer of her spats was privy to her emotions more than she realized it.

Adopting a more youthful hairstyle from her past and tying her thick blonde tresses into a high ponytail, Tsunade kept her hands clenched while leaning her washboard chest and cheeks against a smoother glowing tree. In Shikkotsu Forest, this is a grave... but fuck it, the two were eager to meet each other after a few days itself.

'Young' once again since they decided to try dating her in various stages of life except when she was just too young, Tsunade glared back at the imp while feeling the folds of her crotch turning damp a bit and she had no doubts that it would show since... she was 'ordered' to keep her ass naked under the outermost layer... given she lost it to a bet.

And he caught on.

Still on his knees with his thumbs splaying her lower lips open, Kai DID hold back from tearing her spats away and sticking in. Unlike Mikoto, Tsunade did want it slow. And the busty blonde had no intentions of giving it to the moment itself and just do it. Just one Dan was enough to make Tsunade cautious in these matters even if the other party was someone she admitted to trusting her life with.

"Hoh~ Tsunade, looks like you missed me, too!"

"Is that how you treat your Sensei?!" Tsunade scoffed in return and demanded, "And is that how you planned the entire evening?"

More than confused, Kai reluctantly stood up and let go of her tight little ass as she turned around and stared into his eyes.

"I did? I thought you had something planned. You were the one who wanted to come here... I'm just filling the blank moments with happy memories," he smirked at the end of it.

"Oh, well, maybe I'm luring you to stall," Tsunade suddenly developed an impish smirk, too, and then Kai's eyes widened. After all, in just that moment, Kai no longer grasped Tsunade's emotions or her presence while she still stood in front of him. The violet diamond seal on her forehead turned verdant green, her amber irides shifted to gold yellow, and straight, dark green patterns spread from her eyes and marked her face from the end of her jaws to the start of her hairline.

{A/N: Similar to how she releases her seal in the war but green and instead of intersecting, it just remains straight completely.}

As she was taking her sweet time, Tsunade reassessed the force she was trying to mess with since Kai did not take more than a moment to enter his Sage Transformation, unlike her current skills which finally allowed her to adopt Sage Mode... but not as quickly as she'd like.

"You... got it?" Kai muttered in an amazed tone. After all, Tsunade is a physical force to be reckoned with and in this state, she's even more dangerous.

Keeping her hands crossed behind her back and leaning forward somewhat, noting the fact that her bust would be pressed against him if she was in her actual form, Tsunade smirked, "Surprised?"

Really, the cheeky minx was only looking for some well-deserved praise. After all, she may have used Katsuyu's help to finally learn how to control Senjutsu but it still needed quite a bit of talent and practice. Not to mention... the bonus she was hopeful for finally did arrive after interacting with nature energy.

"I am..." Kai blinked and then smiled earnestly, "It's good! Really! Now I know how we can spend our evening!"

Just when Tsunade was having her hopes high... just when she was thinking how to reciprocate for the one night that kickstarted their relationship since Kai's mouth and tongue was just too persuasive... she was forced to understand that her disciple and lover could be denser than a chakra ore at some moments when he grinned, "Come on! I'll teach you how to change and form the Strength of Adamantine Sage, the seal on my forehead, I mean. It'll help you even store Senjutsu Chakra, and Tsunade! Heh, I'm the master this time!"

She just blanked out. Sure, it sounded good and all...

BUT... she needed to reward him... and ehm, maybe... just maybe... get a reward that did not include a lecture on seals from a guy more than half her age?

Tsunade's eyes widened as Kai unsealed a rather thick scroll...

'Damn, I can't even concentrate now...' She whined internally and still couldn't speak up honestly.

As they got down to it, Kai also had a few questions about Tsunade's sage mode. The first and most important one being... how did she perceive the nature around her and IF she felt a shift in her physical being...

And the answer both surprised Kai but also was to be expected. It was becoming increasingly clear that Hashirama... had something weird going on to the point that his stem cells can create wooden monsters and the effects of senjutsu on his legacy...

---

Now aside from the usual grind including researching Fukushu and Cerberus, Kai had two important choices. Now, these two options were truly unusual and his experience suggested that if he picks one, for some time, he will be quite busy with the individual directly related to the choices.

After forming Chakra Origin Seal, Kai had enough inspiration to go ahead and assist Kushina and Orochimaru.

The former needed a seal that freed her from the constant threat of blowing up like a chakra nuke.

The latter needed a seal to finalize a special jutsu, most likely a forbidden one, which shall help her master many things to come.

The choice, in the end, came easy for Kai. He cared for Kushina quite a bit just as much as she fussed over him and he needed to know that she would be able to form a better bond with Kyubi inside of her without its negative chakra leaking into her system. And with that goal finalized, Kai got down to it.

Aside from the daily routine of his clones with Minato, Tsume, and Nono— not Mikoto since she had yet to return— Kai had a few clones, like usual, master the sage variants of the normal jutsus he possesses. Finally, he himself got down to three things.

Chakra Origin Seal.

Various second nature of elements on rasengun and trying to implement them on the Revolving Heaven Technique, too. And of course, developing a seal with Kushina during the afternoon.

It's in times like these that the ability to remain fine without the need for sleep came into a clutch.

Kushina, of course, was quite dissatisfied with the lack of her beefcake in bed with her for the night but she had grown... somewhat, mentally. Besides, she wasn't into having a clone in the absence of her guardian so Kai didn't even think of offering it. To be fair, he himself wasn't that crazy about the idea of an individual clone of his shacking up with someone else. Some rights should remain with him alone... or the jutsu he planned after his current responsibilities are taken care of.

The first thing he mastered was the Chakra Origin Seal... and he was proud to say that many trees that once were some other living organism in Shikkotsu Forest were now a mass of chakra...

[Chakra Origin Seal (25/25): Turns the selected non-sentient targets into a mix of unique chakra. Reduce Chakra Consumption by 2% at every level. Current Consumption: 12116~??]

Aside from Frost Rasengun and Shurikengun, Kai finally got something for the lightning attribute.

Like wind nature whose second nature is cutting, Lightning nature also has the effect of 'crumbling' things. But, in medical practices, Tsunade had developed Body Pathway Derangement that used lightning nature to affect the nerve endings in the body. The Sage Variant of this Jutsu was similar, too. Truly, most of the sage variants of a jutsu were just more enhanced versions of it, that's all.

But this wasn't the point.

Aside from 'Crumbling', Lightning nature had other less-than-explored effects. Another instance would be Tsunade's father forming the [The Lightning Network] which forms a web of electrical impulses that records data from one location and shares it with the other in codes. This Jutsu made Tsunade's father the clan's spymaster before he was assassinated by Danzo. In fact, the electrical nature was being used to promote the growth of the appliances of the common folk, too.

In this wide variety of applications, Kai managed to bring another spectrum to lightning nature.

[Railgun (5/5): A highly charged chakra compressed into a spiral state that rejects the surrounding at an accelerated pace and travels in a straight line while generating substantial heat in the process. Increases the mastery of lightning stat by 2% at every level. Reduces Chakra Consumption by 10% at every level. Chakra Consumption: 7250~??]

Unlike Frost Gun and Shurikengun, Kai adored this Jutsu. First, the former two would actually hurt the user if they are not careful during the process itself. Second, each of the former two techniques had a distinct signature to it. Frost Gun would reduce the surrounding temperature and the Shurikengun would leave a keen noise in its wake.

Compared to them, Railgun was quieter. It was quicker, too, unimaginably so. And yes, it left a sonic boom AND also charred and distorted the air around it but by the time the enemy registers it, they'd be most likely dead.

Yet, his greatest accomplishment this week, almost by the end of the year, was not the grind for these two techniques, no...

"We did it..." Kushina whispered and looked at the final length of a rather substantial scroll with god knows what was scribbled on it.

"Yeah..." Kai muttered. He did not doubt that they would form something but Kushina did surprise him. Or maybe... he was simply not up to date with her current abilities. After all, she had stopped boasting about every little accomplishment she made a long time ago... since Kai mastered the inheritance meant for her. Instead, she just doubled her efforts silently alongside training in water and wind nature transformation jutsu and it paid off today!

"It's beautiful..." Kushina still looked dazed and mesmerized only to be jolted awake by Kai's words, "Right, let's get you naked and prepared."

"W-What?" Kushina stammered with cheeks flushing while Kai snickered and poked her cheek, "Not for that, silly. For the seal. Someone has to prepare it for you. Let's get Sensei included. We'll need someone looking out for us and clones wouldn't cut it. After all... you can't hope to mess around with Kyubi in a half-assed manner."

She pouted but eventually agreed.

"Fine," Crossing her arms, Kushina soon grinned, "Heh, when I become a perfect Jinchuriki, I'll kick your ass for comments like these!"

"Believe me, if you become a Perfect Jinchuriki, I'LL get to kick not only your ass but Kyubi's, too. And then I'll spank what is mine!" His hand struck her bottoms quick enough to make her yelp and then glare at him in annoyance.

Only at times like these did she wish Mikoto to be present so she'd get the brunt of it, too.

***

Alternate Title: Railgun is Here; The Master of Bottoms Aim For Fox!

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A/N: At first I thought of just bringing the vanishing rasengun instead... but fuck me. How can the creator of naruto NOT understand how dumb Vanishing Rasengan is? Like fuck! They have dojutsu that trace chakra. It's not invisible to their eyes but apparently it is? So I just chose Railgun copy for more destructiveness... believe me. I know I said that Kai will not even use most of these Jutsu but he grinds them because that's his nature... but he will need all the strength he can have and NOT for Kaguya. I ain't just planning world building around one horny rabbit waiting to get pumped.

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