"Hm?"
Koyuki accepting it so calmly took Aoba a little by surprise, though not too much.
More than anything, he was curious.
After all, Yugao, Anko, and the others had all agreed for all kinds of different reasons, so he wanted to know Koyuki's reason too.
"Are you really curious why I agreed so easily?", Koyuki saw the thought in Aoba's eyes. She smiled a little slyly and deliberately left him hanging.
Seeing her smile like a little fox, Aoba couldn't help but pinch her, "So why?"
"There's actually no special reason."
Koyuki lay against his chest and began explaining in a slightly coy, affected tone.
"It's just that you said you already talked to the others, and now you're telling me about this. Doesn't that mean those capable older sisters already agreed? If I, the most useless little sister, don't know my place, then after I marry in, won't I get picked on by the older sisters every day and then every night I can only… ah?"
"..."
'Is talking like this some kind of natural talent for girls?'
'How did even Koyuki learn it?'
Aoba couldn't help but smack her butt a bit harder, "Who did you learn that tone from?"
"Ugh~"
Koyuki immediately covered the spot he'd just hit, looking hurt, "Why'd you hit so hard?"
"That's because you were saying weird stuff."
Aoba also helped rub it for her.
The stinging pain from behind quickly faded. She knew it was his medical ninjutsu, and she muttered softly, "What I said was the truth anyway."
She was the weakest. When the time came, she'd definitely be at the back of the line.
If they all got married together, then they'd also enter the bridal chamber together.
If she wanted to join in before her turn, then she'd only be able to...
"..."
Aoba was speechless and simply changed the topic, "How's your recent study of medical ninjutsu and sealing techniques going?"
"I've already grasped a few simple medical ninjutsu, but sealing techniques are too hard."
Koyuki replied with a troubled expression.
"It's fine, take it slow. You've only just started learning anyway. Once your proficiency in medical ninjutsu and sealing techniques improves, I'll teach you the Yin Seal. By then, you can last as long as you want."
Medical ninjutsu and sealing techniques were the foundation for learning the Yin Seal.
Mainly because Koyuki really lacked basics. She only learned how to refine chakra after she got together with Aoba.
"..."
But after hearing that, Koyuki didn't look excited. Instead, she tilted her head and asked curiously, "So this is what you called 'drawing a big pie' before?"
"..."
Aoba couldn't help but twitch his mouth and gave her another light smack.
"How is that drawing a pie? I'm stating facts. After using the Yin Seal, you can consume chakra to instantly restore your stamina to peak condition. And I can replenish your chakra. Doesn't that mean you can last as long as you want?"
Of course, things like this weren't just about stamina. Mental limits were important too.
After all, if it was too frequent and nonstop, it was easy to turn someone into a temporary fool.
"But I can't even learn sealing techniques right now. Who knows how many years it'll take before I can learn the Yin Seal," Koyuki said somewhat self-defeatingly.
"Then learn it slowly."
Aoba's expression turned serious, like he was facing a student who wanted to drop out because they couldn't keep up. He patiently guided her, "If you can't learn it in a year, then take two years. If two years isn't enough, then five. If you still can't, then ten or twenty years, until you learn it. As long as I have my eye technique, you'll definitely have enough time."
"Do you want to watch yourself turn into an old woman ten or twenty years later?"
"Ugh… I get it."
Koyuki imagined the terrifying scene of twenty years later, where Aoba still looked like he did now while she had become an old woman. Even though the sealing symbols gave her headaches every day, she could only grit her teeth and keep trying.
That kind of future was too scary.
Seeing her regain her enthusiasm for studying, Aoba naturally showed a satisfied expression and patted her head.
"Don't worry. With me around, you'll definitely learn it."
"Mm."
"Then want to go another round?"
"Mm… mm?"
Koyuki nodded instinctively, but after realizing what he meant, she quickly shook her head.
"No… no need for that."
If they went again, she'd really break.
But that only strengthened her determination to master the Yin Seal even more.
Seeing her like this, Aoba didn't force her and pulled her into his arms.
"Go to sleep early. I'll leave after you fall asleep."
"Mm?"
Koyuki blinked and pouted in dissatisfaction, "Wasn't it my turn tonight? Why are you leaving?"
"I need to go be with Karin tonight. It's her first time."
Aoba didn't hide it, "I'll make it up to you next time."
"Karin?"
Koyuki remembered that red-haired, somewhat loud girl.
"Isn't she still a bit too..."
She stopped halfway, then realized after thinking carefully that the noisy little girl had already reached marriageable age.
She dropped that question and asked something else she cared about more.
"Then… is she better, or am I better?"
Koyuki thought that although Karin was a ninja, it was still her first time, so she should be better, right?
Then she saw the look of pity on Aoba's face.
"..."
"Karin is from the Uzumaki clan. Vitality and endurance are her strengths. At least compared to you, she has…"
"Alright, you don't need to say it!"
Koyuki directly covered Aoba's mouth before he could go on, puffing her cheeks.
"I'm sleepy. Going to sleep!"
Aoba: "..."
He felt like Koyuki's motivation to study had risen even higher.
Looks like he was actually pretty good at encouraging people to study.
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