The reasons why Kurama might want to cover up what happened are quite simple. It's not even that she let him see her naked, taking a huge blow to her swollen pride. The main problem is different: Naruto practically abused her, and she weakly resisted. She behaved like a shy girl, and also conveyed to him a significant amount of feelings experienced at that moment.
Kurama built herself into perfection, supreme beauty and the embodiment of strength, and here such a tearful scene ... For her, this is a real slap in the face!
Naruto had already nearly ruined her great image, and now even more so, saw more than she dared to endure. Worst of all, she also enjoyed herself in the process...
One has only to imagine how much all this angers this hot-tempered girl.
Kurama may have been acting ridiculous, but she wasn't stupid. Certainly, she knew about the reverse effect of the fusion, which she herself had a hand in. All her excitement, pleasure, fear, and every bit of feeling towards her jinchūriki could not hide from him. That is why she must be afraid of revealing the truth with all her might.
But even here Naruto could find an obvious weakness. The first time they met, after her transformation, Kurama showed herself so arrogantly that perhaps in contrast to her wounded ego, she would also feel angry that he would forget her magnificent beauty, and make her the only one affected.
"Hit me if I'm wrong..." The Hokage grinned impudently, remembering her red face and that unforgettable fear shown in a moment of weakness. What a pity that he did not control himself then ... She certainly would not have been able to escape!
Naruto understood other people's thinking as well as his own. Even if she is a biju, a woman is a woman. All of them are ready to conquer. This is why the bad guys are more likely to succeed. Since the method is not important with a girl, the result will mean little to them. Ultimately, feelings cannot be changed.
At that time, at the first meeting, Naruto showed coldness and indifference. Who could have known that this would affect the whole scheme and give him a better chance of success? Even if he hadn't planned until now, he was wise to keep his distance. The intuition and flair of the hunter never let him down. And now, thanks to this, the advantage remained on his side.
Caution is an important factor in psychological struggle and manipulation. Kurama is a difficult opponent, but its conquest is a matter of time.
Naruto quickly sorted out all the information he had, enjoyed the fond memories of his Chanterelle's luxurious body, and also had fun with her emotions. As a result, even more convinced of the desire to conquer it.
The plan was built in the course of reflection, but the moment for its implementation, oddly enough, has not yet come.
"I think it's going to take a long time..."
In any of the paths of this plan, it was required that Kurama sweat a little more. Now she is in a shaky position, while he has all the cards in his hands. So now, even if the buff after receiving the reward somehow stirs up the fox, Naruto will simply continue to act like nothing happened.
A quarrel will not solve anything, and with such a self-satisfied girl, being too persistent is a big mistake. Kurama's position is too special, because it is, in fact, part of him. With a fox, you need a trick appropriate to it. She will certainly be ready for his attack, so she will have to strike as unexpectedly as possible, and so that the damage is as significant as possible.
- Let's take a look...
Naruto didn't doubt his cunning, and Kurama didn't doubt it... She must have been afraid of that, even if she didn't want to admit it. Either she will lose her vigilance, or she will simply become unstable and nervous due to psychological pressure. After all, the longer she waits for the attack, the more difficult it will be to hold out in the final battle. It is not known which way she will go, surrender or fight. Man or biju - no matter what personality or what choice. After all, the hunter had driven her into his territory long ago.
Naruto planned everything, it remains to wait for the right moment.
"Haa… Okay…
Now that everything was ready, it was time to get back to the business of the day. Even if Kurama interfered like last time, he knew how to respond.
All conditions are met, and therefore, no longer thinking about what happened, Naruto took another step towards strength ...
- Begin.
And as soon as he wished to take the reward due, his body was immediately covered by the already familiar otherworldly power!
- Hm...
Threads of golden energy flowed through the limbs and this time went straight to the brain!
"Wh-what the..." Naruto narrowed his eyes sharply. For some reason, the light began to practically burn out the eyes. It became unbearably hot!
This time, the transformation began much faster. The body itself seemed to be striving to merge with this magical energy. She changed it, and it asked for more! Nothing is surprising, because in addition to pleasure, this force so often influenced the whole organism that it had long been accustomed to and adjusted to its enchanting influence...
The Hokage could not understand what kind of divine power that could affect the body and soul.
Meanwhile, the tension only intensified... Pleasure reached the brain and at the same time, something strange happened... Naruto's eyes suddenly lit up with golden chakra!
Intoxication suddenly turned into pain ...
The light burned out my eyes!
"Uh... Damn!
The Hokage could not resist and waved his hand, sending a sake cork in the direction of the light bulb!
A bright flash was replaced by the sound of breaking glass...
Shards rained down from the ceiling like tears, dropping in the darkness.
The light went out and it became easier.
"Ha… Here…"
Naruto took a sip of sake, then grimaced and closed his eyes. The pain hasn't gone away! Mixing with the threads of pleasure, it seemed to tease the mind and mocked its perception...
This strange power for some reason began to affect the eye, but that was only the beginning...
"Kh-h! Damn it!
In the next moment, a terrifying pressure gripped Naruto's head, and an insane burning sensation swept through his entire body!
Together with the boost from the spiritual skill, this energy developed every indicator in him, from the chakra to all the elements.
As if thousands of ants got under the skin and began to bite into the flesh! The pain was appropriate...
Maybe for Naruto, increasing each skill in the rank did not mean anything, but in fact it was a terrifying influx of power! Even his incredibly strong and resilient body received a huge return.
Seven days of sex with Tsunade didn't exhaust him as much as the seconds of this evolution...