Because Young Dragon Level Dragon Blood is a lower grade than Dragon Blood, its Fire Energy and Life Essence aren't as overbearing.
Combined with the bathing method, which isn't as effective as direct application, Naruto decided to give Hinata a spa treatment.
He turned and entered the training room, actually taking out the exchanged Young Dragon Level Dragon Blood from his item bar, then returned to Hinata.
"Naruto, what is this?"
Hinata saw Naruto shaking a crystal-shaped glass bottle in front of her and asked curiously.
Inside the glass bottle was a mysterious liquid, as red as blood, thick and shimmering with tiny golden specks.
As Naruto shook the glass bottle, the liquid gurgled with bubbles that popped with a "pah" sound.
"This is a secret medicine left to me by my parents, called Dragon Blood."
"Dragon Blood?"
Hinata blinked.
Naruto shrugged and replied, "I don't know if it's really Dragon Blood, but I can confirm its effect."
"What effect?"
Naruto smiled and replied, "It tempers the body, making it stronger."
"Part of why I'm stronger now than before is thanks to it."
"That powerful?"
"Mm."
"Now, I'm going to use it on you."
Naruto pulled the stopper from the crystal glass bottle with a "pop," and wisps of hot steam immediately rose, accompanied by scattered golden glints.
Hinata shook her head and waved her hands, saying, "No, no, this was left to you by your aunt and uncle, I can't use it."
Naruto smiled and explained, "Don't worry, I've already used it, and Dragon Blood has a characteristic: if you use it too much, it loses its effectiveness, like drug resistance."
"Really?"
Hinata tilted her chin up, her light purple eyes gazing into Naruto-kun's azure pupils.
After only a few seconds, she shyly turned her head away, murmuring, "It's really too precious... I... I can't take it..."
"This bottle of Dragon Blood is useless to me, and once opened, its medicinal properties will gradually evaporate, so not using it would be a waste."
"Alright, alright, if I'm giving it to you, just use it."
Naruto said in an undeniable tone.
"O-okay..."
Hinata nodded obediently, then dutifully opened her mouth.
"Ah~"
"?"
Naruto-kun froze, then shook his head, both amused and exasperated, "Silly, Dragon Blood can't be drunk directly, unless you have internal organs and intestines as strong as a dragon's."
Although people in the Fire Shadow World have 130 trillion cells, while Earthlings have 40-50 trillion cells, nearly a threefold difference, making Fire Shadow humans have greater cell density and stronger physiques, they still can't compare to dragon species, which are high-tier beings from birth.
(Note: The 130 trillion cells in Fire Shadow World humans might not be official setting; the author is unsure, it might be a widely circulated fan theory.)
Drinking high-purity Dragon Blood directly, even Young Dragon Level, would rot the intestines and scald fragile organs to death.
"Then... how should it be used...?"
"Simple, just apply it directly to your body. It will be absorbed through the skin, allowing the medicinal power to slowly penetrate from the outside in."
"Take off your clothes, and I'll help you apply it."
"Ah—"
Upon hearing that she needed to take off her clothes, Hinata's cheeks flushed crimson, the color spreading from her face all the way to her ears and neck.
"I... I... I can... do it myself... can't I...?"
Hinata lowered her head, her two index fingers poking together, her eyes darting left and right, her cheeks so red they looked like they might drip water.
For the young people in the Ninja Village, they matured early, so the Ninja Academy's biology classes also taught knowledge about reproduction.
Hinata, knowing the difference between males and females, was naturally more reserved and conservative, feeling embarrassed to be bare in front of Naruto, let alone letting him... apply it all over her body.
Naruto didn't push too hard and settled for a compromise: "How about this, you can't reach your back, so I'll help you apply it to your back, and you apply it to the other areas yourself?"
"Mm..."
Shy Hinata nodded slightly.
Although being bare-backed was still embarrassing, it was much more acceptable than having it applied all over her body.
"Nar... Naruto-kun... can you... turn around...?"
"I... need to take off my clothes..."
Hinata's voice was soft and tiny, as faint as a mosquito's buzz, almost inaudible at the end.
"No problem."
Naruto turned around, and with his hearing, he could clearly hear the rustling sound of Hinata taking off her clothes.
At the same time, Naruto silently chanted the mist ring's incantation, shielding the perception of the Sealed Space.
"O-okay..."
Time in the single room seemed to slow down; the doors and windows were closed, but Naruto felt a tranquil and peaceful sensation, like the afternoon sun casting a Tyndall effect, and it seemed a long time passed before he heard Hinata's faint, shy voice.
Naruto turned around and saw a back as white as jade, slender and delicate, and Hinata's small head.
Hinata clutched her clothes tightly, trembling with nervousness.
"Nar... Naruto..."
"You can apply it!"
Hinata seemed to have mustered her courage, and her voice was much louder.
"Then I'll apply it. It might hurt a bit, so bear with it."
Naruto approached, looking at the fair, slender, jade-like back, without any improper thoughts, merely pouring a little Dragon Blood into his palm and then applying it.
"Mmm!"
Hinata winced, her back arching forward slightly from the pain.
"Are you alright?"
Naruto quickly moved his hand away.
Hinata shook her head.
"I'm fine, please continue."
She gritted her teeth, enduring it bravely.
Even the Young Dragon Level Dragon Blood raw liquid still emitted a scorching heat that was difficult for ordinary people to bear.
No wonder some say that pure-blooded dragon species are born from volcanoes, and the magma hidden beneath the earth's crust is called the Fire Dragon's Vein.
Dragons, these high-tier life forms, even have molten rock flowing in their hearts; each heartbeat pumps an endless supply of intense Fire Energy throughout their entire bodies.
Over time, it's difficult for a dragon's physical body not to be powerful.
As long as enough time passes, the dragon's body will be tempered a thousand times over!
Naruto applied the Dragon Blood, which melted like hot wax, all over Hinata's back.
As the Fire Energy penetrated and the heat evaporated, Hinata was drenched in sweat, and white mist continuously steamed from her head like a boiling kettle.
"Alright, your back is done. For the rest of your body, you can apply it yourself."
Naruto extended his arm over Hinata's fragrant shoulder, handing her the crystal bottle.
Hinata softly assented, raising her hand to take the crystal bottle, pouring out the Dragon Blood, and applying it little by little to various parts of her body.
Naruto wasn't worried that Hinata would apply it unevenly.
Because the Dragon Blood's Fire Energy and Life Essence would penetrate into the body and flow throughout the entire body via the vast meridian system.
Theoretically, applying it just to the back would actually suffice.
It's just that applying it to the whole body would make the absorption faster.
After a short while.
Hinata finished absorbing the Dragon Blood, put on her clothes, clenched her fists, and her eyes sparkled with surprise.
"Naruto!"
"I... I feel so strong now~"
"Thank you!!"
Hinata clenched her fists, and her eyes were practically sparkling with excitement and adoration.
Naruto chuckled, thinking, "A whole bottle of Young Dragon Level Dragon Blood, and applied directly. Hinata's improvement is probably even greater than mine."
"Hyuga Hiashi will be shocked now."