After training diligently according to Saitama-sensei's One Punch Man method, Ryosuke successfully improved his physical attributes.
At noon, he bathed briefly, ate, and slept. Upon waking, he headed straight to Kurenai's house.
Kurenai hadn't expected Ryosuke to arrive in the afternoon—she thought he would come at night. It seemed he was planning to stay over.
But for her, this was a pleasant surprise, so she felt no rejection.
Ryosuke, upon arriving, wasn't in a rush. He spent time with Kurenai, shopping and eating together.
When night fell, they returned to her home.
Her mother, naturally, wasn't there.
At that moment, Kurenai glanced shyly at Ryosuke.
"Wait a moment, let me wash up first."
Ryosuke gladly agreed.
Smiling softly, Kurenai walked into the bathroom. She didn't want any trace of dirt on her body that might displease him.
After half an hour, she came out wearing short shorts, wrapped in a towel.
She knew this appearance would captivate Ryosuke the most.
Her face was flushed, steam still rising from her skin, as she looked at him.
"Ryosuke, I'm done washing."
Ryosuke was momentarily dazed.
She looked… delicious. But he restrained himself.
After all, she had presented her pure self to him—he had to treat her with respect.
Unable to resist, he walked closer.
"Kurenai, give me a towel too. I should wash as well."
From her drawer, she handed him a fresh towel with one hand.
Ryosuke almost lost control, but steadied himself. Grabbing the towel quickly, he rushed to the bathroom to wash up.
In just two minutes, he was finished. He had simply rinsed off the dust from his body.
Wrapped in his towel, he returned to her side.
The night passed without words.
By the next day at noon, Kurenai finally opened her weary eyes.
Eight rounds had left her completely exhausted.
Yet her heart was filled with happiness.
Ryosuke, of course, had long been awake. He simply couldn't let go of this soft, tender woman in his arms.
Indeed, a man needed the nourishment of a woman.
After last night's battle, he felt a comfort like never before.
At the same time, he had gained 0.5 units of chakra.
Warmth surged through his body, his chakra growing even stronger.
Then, the system's voice echoed.
He hadn't expected a single night to grant him 0.5 units. If this continued, then through the union of man and woman, he could amass vast chakra reserves—perhaps even rivaling a tailed beast.
Reflecting on the original story, Kakashi once said Naruto's chakra was four times his own, and if the Nine-Tails wasn't suppressed, it was a hundred times greater.
That meant the Nine-Tails' chakra was roughly ninety-six times Kakashi's.
The Nine-Tails possessed the mightiest chakra of all the tailed beasts.
With this, Ryosuke would never again need to worry about running out of chakra. And since opening the Eight Gates also required chakra to sustain, the stronger his chakra, the more powerful and enduring the Eight Gates would become.
Of course, he still needed an even stronger body to support it.
He wondered if last night had made Kurenai pregnant.
But even if not, repeating the act a few more times would surely succeed.
Given their relationship now, doing it again would not be an issue.
And with his exceptional stamina, he could easily continue.