'Still, as proof of my sincerity,' said Orochimaru's mental imprint, 'I will teach you one of the two Jutsu you've asked for— but if you want to keep learning from me, then you'll have to do another favour for me…'
Inner Sakura scowled at Orochimaru— of course it wouldn't be that easy with that treacherous viper. There was no way Orochimaru wouldn't be able to easily breach Konoha's defences and rescue his subordinates with the Leaf Village in its current state, so who was he kidding!?
'I'll take the Genjutsu, then,' said Inner Sakura through gritted teeth. 'The one that makes feathers fall from the sky…'
It wasn't as if she had much of a choice— Breast Illusion was a powerful Genjutsu in its own right, but it only worked when people were ogling her chest… which was quite often, actually. Furthermore, even though she had tamed Inner Sakura and regained her Genjutsu powers, Sakura was still not at maximum power— she could only safely manifest 477% out of her full Kurama clan 896% yin chakra affinity, at her current stage in her training. Without the rest of that power, Breast Illusion wouldn't paralyse straight women; only obstruct their vision.
'Girls are like spaghetti,' said Inner Sakura, nodding to herself. 'Straight until it gets wet.'
'Your hypothesis is intriguing,' said Orochimaru, ever the scientist. 'What was your sample size when you tested this theory of yours?'
The answer was one, but that really wasn't the point.
'I see,' said Orochimaru, finally getting the message. 'Very well then, I shall teach you the Temple of Nirvana Jutsu…'
Surprisingly, the Feather Illusion Genjutsu was very similar to the Breast Illusion Genjutsu, in that they were both based on Buddhism.
In the context of the Breast Illusion Jutsu, Sakura's chest was the medium through which she would bring an illusion of Sukhavati— the Pure Land— into her opponent's mind; plunging them in advance in the unending bliss that would normally await them after escaping from the cycle of Samsara and suffering.
In comparison, in the context of the Temple of Nirvana, the feathers represented liberation from suffering— the escape from the cycle of Samsara. Since existence itself is suffering, it's through this mechanism that the Jutsu emancipates its victims from their consciousness; thereby knocking them out.
'I see,' said Inner Sakura, nodding to herself smartly. '…Nope, I don't get it.'
In other words, Sakura's Jutsu would manifest a fake version of the real Pure Land in her opponent's mind, while Orochimaru's Jutsu would force its victim to undergo a false enlightenment.
'You've already understood a similar Jutsu,' said Orochimaru pleasantly. 'That is why I brought up the similarities.'
Now that she understood the Jutsu's principles, Sakura only needed to practise with the limited amount of time she had left. After all, there was less than a week left until the wedding— once the party was over, Sakura and company would have no excuse to keep hanging around the Hidden Cloud to look for Hinata, especially if their employer Tsuchimikado-sama was gone…
'Leaving already?' asked Orochimaru, noticing Sakura's intentions. 'Didn't you want to learn more Jutsu from me, Sakura-kun?'
Ideally, Sakura would leave Orochimaru's consciousness imprint alone for the rest of her life. She didn't trust him, and she didn't like him— and most importantly of all, she didn't want her actions to be dictated by a bit of chakra attached to her chest.
'You'll be back,' said Orochimaru, licking his lips with his elongated tongue. 'Deep down, you know you want my knowledge…'
Sakura decisively withdrew her consciousness from Orochimaru's chakra bubble, but instead of returning to the waking world straightaway, she directed her attention to the new light that was shining in the darkness in her inner world. It was warm and soothing, but there was also a melancholic feel to it— it belonged to Tsunade. Sakura reached out to it, and…
'So, my main self gave you grandpa's necklace,' sighed Tsunade's mental imprint. 'I can't help but notice that you're not wearing it…'
'You're the one who gave me a cursed necklace,' Inner Sakura protested. 'Why would I wear such a thing?'
Originally, Sakura hadn't been very superstitious— but after experiencing so many fantastical things after her reincarnation, she didn't quite know what to believe in any more. If reincarnation was real, the afterlife was real, and real-life ghosts like the Sage of Six Paths were also real… then all bets were off!
'But that's not the real reason you're not wearing it, is it?' said Tsunade. 'My main self told you to safeguard it until the time was right…'
After giving Team Sakura her blessing for their rescue mission, Tsunade had given Sakura her priceless necklace, just as she had promised— but it wouldn't been hers to keep forever.
'My main self told you to give the necklace to the person you believed in,' said Tsunade, 'when he was ready to become Hokage.'
Tsunade might have seen Nawaki and Dan in Naruto, but she had also seen a shadow of herself in Sakura. The First Hokage's necklace had always been destined for Naruto— it was just taking a roundabout path to its final destination.
'The necklace has the power to suppress Tailed Beasts,' Tsunade added. 'I gave it to you because I believed that you would always stand by Naruto— he feels at ease when you're at his side, and that is a far better protection against the Nine-Tails' malice than any necklace could ever conjure up.'
The truth was that Sakura felt guilty about ruining the so-called sacred timeline by interfering— and to her shame, her first reflex upon causing the failure to recruit Tsunade had been to run away, using saving Hinata as a pretext.
She knew it had to be done, but it had still eaten her up from the inside…
'I'll wear it from now on,' said Inner Sakura meekly.
'Good,' said Tsunade, her expression softening. 'Now, you wanted to learn the Yin Seal?'
Sakura nodded.
It seemed like learning the Temple of Nirvana Genjutsu would be easier than Sakura had erstwhile thought, so as long as Tsunade would be tutoring her every step of the way, then learning the Yin Seal for its ability to power the permanent Transformation Jutsu would be Sakura's new priority.
If Sakura's calculations were correct, then by stealing Samui's H-cups and Nii Yugito's B-cups, Sakura would swell from her already enormous I-cups to ridiculously huge N-cups in a single leap! That was one size smaller than Hitomi Tanaka, and four entire sizes bigger than Tsunade's J-cups— and that was a size that her small body was not ready for!
(Tsunade has a 106 cm bustline, so assuming a very fit adult woman's 75 cm band size, we get American 32 J's)
'Even so… You're not mad that I stole you breast chakra?' said Inner Sakura weakly. 'I don't need to make amends before you'll teach it to me?'
'Who do you think I am?' said Tsunade in annoyance. 'I'm not Orochimaru!'