San Shanglin picked up the toolbox from the ground and walked into a shower room separated by transparent glass. With her back to Song Ning, she spread her legs, stuck out her buttocks, and revealed her tender honey hole and chrysanthemum bud.

She first took out a cotton ball, soaked it in alcohol, and wiped her vulva and anus. After discarding the used cotton ball, she took out two bottles of liquid with a thin, conical tube attached to the bottle opening. She inserted one bottle between her legs and aimed it at her vulva, and the other bottle behind her back and aimed it at her anus. She inserted the thin tubes into her body one after the other, until the bottle openings were against her vaginal opening and anus, and could not go any further.

With a forceful squeeze of both hands, she quickly forced the saline solution from the plastic bottle deep into her vagina and rectum. The liquid rushed into the rectum and vagina, flushing out bacteria and impurities from deep within. After using up both large bottles of saline solution, Mikami Rin finished rinsing herself, rinsed herself clean, and dried herself before coming out to begin her sampling. Pointing to a bed nearby, she said, “There’s a bed over there. If you’re tired, lie down. If you’re not tired…”

Song Ning shook her head, followed Lin to the bedside, and asked, “I’m not tired, but there are so many things I don’t understand. What exactly is going on?”

Rin walked to the bedside and climbed up, sitting there with her legs apart, leaning against the headboard. Her vulva was clean, without pubic hair. Without using her hands, her thin labia automatically parted, revealing her tightly closed vaginal opening. Her expression was calm, showing no sign of being about to be violated. “Do you know 801? A strange disease that causes men to lose their sexual ability, and so far there is no cure.”

Song Ning also climbed onto the bed and knelt between Lin’s spread legs. “Hmm, I’ve heard of this disease. If someone can develop a cure, they will become famous and gain both fame and fortune.”

Rin applied lubricant to the glans of her penis, which was pressed against her private parts. The previous douching had made her vaginal opening very dry. She said, “Use less lubricant. Too much will affect the pleasure.”

Song Ning held his penis and moved it up and down, rubbing the glans back and forth between the labia to spread the lubricant before inserting it into the vagina: “Could it be… that 801 is a contagious disease?” He voiced his guess.

Rin Mikami’s body trembled uncontrollably. “It’s so swollen… ‘Infectious disease,’ that’s not quite accurate. Be gentle, my vagina isn’t used to such a thick penis yet.” She took the lubricant, squeezed some out, and applied it to the uninserted penis, spreading it evenly with her hand. “We’ve been researching 801 for almost ten years and discovered it’s a disease that can be inherited between mothers and daughters and is transmitted one-way to men through sexual intercourse. Insert slowly…”

“Mother-daughter genetic transmission? One-way transmission to males?” Song Ning thought of Yuka Mikami and her parents.

Rin bit her lip and explained, “Yes, Professor Misato and her daughter are carriers of the disease, while the head of the family and you are infected. Ah! Slower~ It’s all the way in…” The female researcher bit her lip, seemingly enduring some unspeakable pain. The pain gradually subsided as Song Ning stopped, and she continued to explain, “One-way transmission means that as an infected person, you won’t infect me with the disease if you have sex with me.”

So it turns out that Rin’s teacher, the wife of the old Sankami, and Yuka’s mother’s name is Sankami Misato. “I see… So what about the sampling?”

Rin gradually got used to Song Ning’s thrusting and patiently explained, “The 801 disease is very strange. If you only take samples from female carriers or infected men, the samples will lose their activity in a short time. We’ve tried all the methods, and this is the only way to get the samples.”

Song Ning felt waves of pleasure through his penis. Lin’s vagina was almost dry, relying solely on a little lubricant. Her tender and tight little hole made the pleasure of thrusting exceptionally clear. His penis could feel every detail of her vagina, and he couldn’t help but thrust even harder. “Such a comfortable little hole, can we kiss?”

Rin said calmly, “It’s okay, as long as you like it.”

Song Ning felt something was off. Wasn’t Mikami Rin’s reaction a little too bland? And shouldn’t the response to a kiss be to close her eyes and purse her lips while waiting?

Unable to figure it out, Song Ning bent down, held Mikami Rin’s head, closed his eyes and kissed her lips, thrusting in and out while tasting the female researcher’s red lips.

A short while later, Song Ning realized something was wrong. San Shang Lin’s appearance was too calm. Although his warm body was constantly writhing, there was no panting with desire like during sex. Although his nimble tongue was constantly entwining with hers, there was no close-up breath like during a kiss. Song Ning suddenly felt that the person beneath her was not a living person, but a silicone sex doll. The passionate kisses and intense thrusting came to an abrupt end.

“What’s wrong? Did you ejaculate?” San Shanglin looked at Song Ning with a puzzled expression. Based on her previous judgment, Song Ning probably wouldn’t be able to ejaculate in less than half an hour or forty minutes, but it had only been a few minutes.

Song Ning frowned and said, “No, it just feels a bit strange, like…like having sex with a woman in a deep sleep.” He thought for a long time before finally saying it like this.

Rin was somewhat surprised: “I didn’t expect you to have noticed this. Of all the samples I collected, only the head of the family and you discovered this. Would you like to hear my story? Perhaps it will make your thrusting more comfortable.”