This subtle yet noticeable change made Sakayanagi Arisu both excited and fearful, reminding her of Kamuro Masumi's situation.
Kamuro Masumi had taken first place in the entire school during the sports festival, practically leaving everyone else in the dust.
However, she herself felt completely bewildered.
In the following days, Sakayanagi Arisu repeatedly tested Kamuro Masumi's physical abilities, discovering she could never replicate that performance again, as if it were just a miracle—a fleeting highlight of her life.
Sakayanagi Arisu didn't believe this was a miracle, but rather someone's influence behind the scenes.
Just like with her own body, someone's power was extraordinary, making Sakayanagi Arisu feel deeply wary while simultaneously curious about this power.
Was it a comprehensible power, or an indescribable mystery?
Or perhaps, was he even human at all?
Now, this person seemed prepared to show her that previous power, making Sakayanagi Arisu's heart beat faster despite herself.
"I remember."
Sakayanagi Arisu suppressed her anticipation, "You seemed to have done something to me."
She didn't waste words, since they had already discussed similar topics before.
"I previously said I wanted to cure your illness. I originally planned to wait longer, but I don't know how much time that would take, so I intend to help you manage it for now."
At some point, Kaoru had taken out the [Nano Regeneration Fluid], "This is the same medicine from last time. It has some effect, but it won't cure your condition."
Sakayanagi Arisu looked at the glowing white syringe in his hand, her pupils slightly contracting.
Some biotech companies often used people as lab rats for drug testing, recklessly experimenting with their new medications without even knowing the potential side effects.
Sakayanagi Arisu had never heard of this drug, and her father wouldn't easily let her try any medication that might cause sudden death or lifelong suffering from side effects.
As Kaoru produced this drug, Sakayanagi Arisu didn't even see any labeling on it.
"I didn't intend to use this on you initially, since it can't provide a permanent solution. But the situation was too dangerous at the time, so I had no choice but to resort to this."
Kaoru added, "Of course, if you ask me where this medicine came from, I can't answer. If you refuse, I won't force you."
Faced with an unknown medicine, most people would probably hesitate to inject it into themselves.
Therefore, even if Sakayanagi Arisu refused him, Kaoru would find it completely reasonable.
The Sakayanagi Arisu before him remained silent for a long while before speaking slowly.
"I remember asking you before - why do you want to help cure my heart condition? What was your answer back then?"
"I have the ability to cure you, therefore I want to cure you."
Kaoru smiled, "If I can't even cure your illness, I wouldn't dare to do bad things to you, nor would I dare to like you."
"Heh, so you want to cure me because you want to do bad things to me. You really are a lecherous fellow."
Sakayanagi Arisu originally wanted to mock his lustful nature, but for some reason, the corners of her lips curled into a slight smile.
The way she looked at him shimmered with faint light, like spring breeze rippling across a lake's surface, swaying with a maiden's heart.
Kamuro Masumi pursed her lips.
Though she was quite doubtful whether Kaoru was telling the truth, she remained quiet in this situation, silently watching the two.
"Since that's the case, I have no choice."
Sakayanagi Arisu smiled gracefully and straightforwardly extended her arm - pale and clean, exuding a delicate fragility.
"If anything goes wrong, you'll have to take responsibility for my entire life."
[Nano Regeneration Fluid], with effects of healing injuries and enhancing physical constitution, without any side effects.
Even so, Kaoru still felt somewhat nervous. He had many rewards that could help Sakayanagi Arisu, but he hadn't used them precisely because he feared potential side effects.
Even if there was the slightest cost, Kaoru was unwilling to use them.
If not for the emergency situation where he had already used [Nano Regeneration Fluid] on Sakayanagi Arisu once, he wouldn't feel confident using it a second time.
Kaoru injected the [Nano Regeneration Fluid] into her arm. As the syringe advanced, all the medicinal liquid completely entered her body.
Afterwards, Kaoru withdrew the needle.
This time, he didn't plan to destroy the evidence of the [Nano Regeneration Fluid].
With something like this, Sakayanagi Seishiro would probably believe he had the ability to cure his daughter.
This kind of power was also in a form understandable to humans, rather than some shaman's magical potion.
Kaoru felt confident he could persuade Sakayanagi Seishiro.
Thinking this, Kaoru couldn't help but look up at Sakayanagi Arisu.
Since this was her second time receiving the medicine, her condition should be better than last time.
Then, he saw the girl's completely flushed face.
"Your complexion looks uncomfortable. Are you feeling unwell?"
Kaoru was startled - could the stimulation be too strong for her body to handle?
"No, that's not it."
Sakayanagi Arisu grabbed his sleeve, enduring the strange sensations in her body, her voice trembling slightly.
"It's just that my body feels a bit hot, like something is moving around inside."
Kaoru carefully observed her reactions.
There were no signs of breathing difficulties, though her body temperature was somewhat high, her small face flushed as if about to develop a fever.
"Hey, nothing bad will happen, right?"
Kamuro Masumi grew anxious and couldn't help speaking up.
Kaoru struggled to recall her previous reaction—her body temperature had been just as alarmingly high then, with her face flushed crimson.
After a while, her breathing had normalized.
Thus, this reaction might be a sign that the [Nano Regeneration Fluid] was taking effect.
Despite remaining calm, Kaoru felt a twinge of regret.
"Mmm..."
Sakayanagi Arisu bit her lip tightly, aware that this wasn't a heart attack but merely her body overheating—no, not even a fever.
She could feel a wave of heat washing over her, her heart pounding as if something were controlling its rhythm.
The sensation then flowed downward from her chest, passing through her lower abdomen.
The warmth made her instinctively clamp her legs together, her cheeks burning fiercely.
In an instant, Sakayanagi Arisu went limp, collapsing into Kaoru's arms, her ears glowing red with heat.
"I-I'm fine, just feeling a bit..."
She tried instinctively to rise, but the sensation subtly shifted to her legs and feet.
"Ah..."
Her breathing grew erratic.
The scent of Kaoru filled her nostrils, awakening memories etched deep within her body.
Coupled with the effects of the [Nano Regeneration Fluid], it seemed to misinterpret her reactions as excitement, stirring her own arousal in response.
Kaoru had intended to contact the infirmary, but a window suddenly popped up from his [Emotion Perception], freezing him in place.
[Sakayanagi Arisu: Aroused, Excited, Confused...]
[Target is in a state of heat. Fucking her will effectively alleviate her condition.]
Staring at these prompts, Kaoru was stunned.
Did his [Nano Regeneration Fluid] have such side effects?
"Hey, hey, is she really okay?"
Kamuro Masumi had already jumped off the bed, leaning in close to Sakayanagi Arisu with a serious expression as she felt her forehead.
"So hot—isn't this a fever?"
"I told you, I'm fine!"
Sakayanagi Arisu blushed fiercely and struggled, but the more she moved, the more entangled she became with Kaoru, inadvertently inhaling more of his scent.
"Burning up like this and you say you're fine!"
Kamuro Masumi glared at her in exasperation, then turned to Kaoru. "Idiot, hurry up and take her to the infirmary!"
No sooner had she spoken than Kamuro Masumi tried to help Sakayanagi Arisu up, but the latter suddenly convulsed, her hands clutching Kaoru's clothes tightly as strange sounds escaped her lips.
Kamuro Masumi stood frozen, watching as Sakayanagi Arisu buried her face in Kaoru's chest.
Kaoru held the limp girl silently.
This girl... had just climaxed in his arms!