"Naruto, calm down," she tells him with little success. "As your sensei, you promised to do as I say, so calm down," she commands.
Naruto's eyes lighten and clear of its lustful fog, but he looks wounded, and he's still erect. "I... sorry. I just- I really really want to be inside you again. It's hard just looking at you."
"I... thank you," she blushes at how blunt with his desires he is. "I know it feels good but, we had a lot of sex this afternoon, and a grand majority of woman tend to be sore, or tender down there after such long and repeated sessions. They need time to heal." That seemed to do the trick as he takes a step back worried, asking, "I didn't hurt you, did I? I'm so sorry, Nai-chan. I didn't know!"
"No, no, you didn't hurt me, but I am quite sore," she eases him while omitting the pleasant humming of it. "It's not a bad soreness but we shouldn't do any more today."
"Oh," he sighs, adjusting his pants. "I understand," he sadly says.
For the briefest moment, she thought of comforting him with her mouth, but quickly shoved that thought aside. It isn't necessary to his education at the moment, and more than that, he needs to learn self-control. Still, something is better than nothing, and she gives him a little hope by telling him, "however, I'll feel better tomorrow and I can teach you more then."
"Really?!" he yells catching her off guard. "Really, really?"
"Yes," she answers him with a smile, but stipulates, "we'll meet at your place an hour before midnight. Less chance of being seen that way."
He hugs her for a long time, eventually taking in the scent of her hair and rubbing her back. "Clearly you have a lot of energy to burn," she notes, interrupting his rising arousal by standing and moving towards the front door. "So I'll make you a bet. You go train, and if you make any significant progress in your secret training, I'll give you a treat I'm sure you'll really like."
His eye bulge like saucers and he's out the door in seconds, much to her amusement.
....
NARUTO
"Naru-nii!" Naruto yells excitedly. 'Ow,' Naru-nii yelps as Naruto continues to say, "that's gotta be the best technique EVER!"
'Wait... you mastered it?' Naru-nii asks with disbelief. 'You really mastered Rasengan?'
"Damn right I did," he excitedly claims. "I couldn't sleep—just had way too much energy, so with Kurama's chakra I made a ton of clones and we trained all night. I've been blowing holes in trees all morning! If I ever peg someone with this, they're history!"
'Great job! Hell, man, I think you learned it a lot faster than I did,' Naru-nii happily remarks. 'Though, I didn't know about the way my clones could help me train until years after I'd already learned it... which really bums me out, actually.'
"Yeah! I thought Kakashi-sensei might've told me all about Kage Bunshin, but it was Kurenai-chan that told me about the side effects. Actually, I need to talk to you about her." Naruto tells Naru-nii about the day before about how much more involved she'll be in his life as well as her offer to help him train.
'…I've always been told I was lucky, but I never believed it till now,' Naru-nii mumbles, and Naruto even hears a slight sniff.
"Naru-nii?" Naruto calls worrisomely.
'Right, you lucky fox,' Naru-nii states after clearing his throat and focusing on business. 'Mnn, from what I remember, Kurenai-sensei was always wicked smart,' Naru-nii recalls aloud. 'She's a genjutsu master, which is really hard to do. Team Eight have always been pretty strong, so I know she's a good sensei.'
"Pfft," Naruto's tongue out spits. "Who isn't a good sensei compared to Kakashi?"
'Trust me, I know how much it sucks that he's training Sasuke-'
"Damn right it does," Naruto protests. "AND he never told me about Kage Bunshin training!" Naruto interjects.
'Yes, yes, AND his not telling you about Kage Bunshin training,' Naru-nii humors his younger self. 'But even still, you're doing crazy good too, way better than me at that age. I know you want them to acknowledge your strength, but the most important reason for that strength is to protect your friends, your precious people and most importantly, the love of your life... Kurenai-sensei-'
"Traitor!" Naruto calls as he hears Naru-nii laughing his ass off. "You know Sakura-chan is always in my heart!"
'I know, I know, I'm only teasing,' he jests with a laugh. 'It's just... man, I can't believe it! Kurenai-sensei!'
"I'll forgive you this time," Naruto admonishes humorously. "And only because I completely get it. I love Sakura-chan, but Kurenai-chan… that's a woman!"
'That, and someone willing to help you get stronger,' Naru-nii states easing off the playful banter. 'She's someone we need to protect, so I'm going to make sure you're strong enough to protect everyone.'
"Yeah," Naruto agrees, his tone turning more serious. "It's the promise of a lifetime!"
'Damn right it is!' Naru-nii calls with just as much enthusiasm.
Naruto then asks, "so, what do you think about Kurenai-chan helping us? I really, reaaallly think she should… you know cuz she's smart and all."
Naru-nii laughs heartily. 'Yeah, I bet you do. Um, I don't think it's a bad idea, but I still think we should be careful. If she starts wondering how you know things you shouldn't, it might turn out bad for everyone and get in the way of training. You won't be able to help anyone if you're locked in an interrogation cell.'
"Meh, I bet it'll be fine," Naruto responds confidently. "So, what do I tell her when she asks how I learned Rasengan?"
Naru-nii is silent. '… Damn,' the future-Naruto curses. 'Uhh, I'm not sure if you can. It's not written down in any scrolls and the only two people alive that know it are Ero-sannin and Kakashi-sensei.'
"So then what do I say when I use it?" Naruto wonders aloud, recalling his many daydreams of using his new jutsu to save princesses from evil warlords. "When I use it in front of Kakashi-sensei or if Ji-chan finds out, wouldn't they ask me how I learned it?"
'...that's a good question,' Naru-nii slowly admits, seemingly lost in thought. 'I can't believe I hadn't thought of that. I was just super focused on training you, I hadn't thought what others might say, you know?'
"Soo…" Naruto sounds, leaving it open-ending for Naru-nii to fill.
'Hey, why am I doing all the thinking here,' Naru-nii retorts. 'You help too. We're both pranksters, dattebayo.'
Rolling his eyes, Naruto asks, "mnn, can't someone have told us?"
'Hmm, if we said somebody taught us- well, taught you, than we'd have to say who they are. And we definitely can't say either Ero-sannin or Kakashi taught us cause I'm sure they'll deny it if Ji-chan asked them. If we say we learned it from a scroll, I'm sure you'll have to, if not hand it over, than at least show them proof.'
"Mnn, mmn," Naruto hums in agreement before asking, "can't I just say I taught myself?"
'Well, you could,' Naru-nii skeptically assuages, adding, 'I doubt they'd believe you, especially when you consider who the jutsu belongs to...'
"-The fourth Hokage," Naruto finishes.
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