The Undercover Officer's Obscene Education ~Sex-Crazed Yakumo~

Yuga and the dark elf Ruvi are the talk of the mercenary guild.
As lovers and partners, the two lead busy yet fulfilling lives, but a job they accepted in the port town of Nist befalls them with misfortune.
A moment of carelessness on Ruvi’s part causes her to blow up some research equipment owned by the client, leaving her with the responsibility of paying 1 million yen in compensation.
While encouraging Ruvi, who is feeling deeply remorseful for his mistake, Yuga warns him, “Don’t do something stupid like selling your body, okay?”
However, as Ruvi gazes at Yuga, a question arises in his mind.
“What exactly does ‘selling your body’ mean?”
When Yuga asks more about this discrepancy, he learns that to dark elves, sex is solely for the purpose of reproduction, and they have no understanding of sex for pleasure or to make money. Up until now, Ruvi had always wondered if having sex with Yuga was pointless if he was going to use contraception.
The difference in values between them, which they had unexpectedly discovered, gave Yuga a headache.
But then, with a look on her face as if she had just come up with a brilliant idea, Ruvi said to Yuga, “How much do you think my body would sell for?”
His beloved lover said she wouldn’t mind having sex if it would help raise compensation.
“That’s absolutely not okay!” Yuga replies hastily, but he imagines Ruvi in the arms of another man and is drawn to a strange sense of immorality.

The protagonist is Mashiro, a female spy whose body was made unable to feel sexual pleasure from birth due to a secret technique passed down through her family.
Invincible against sexual attacks, she spends her days achieving overwhelming success in erotic combat and erotic training.
However, in the school management organization "Erotic Arts Academy" that she infiltrates this time, the enemy's leader breaks the spell that made her frigid!
She feels sexual pleasure for the first time.
She reaches a sexual climax for the first time.
And for the first time, sexual desire surges within her, overwhelming the female spy...!
Erotic enemies with ruthless erotic traps show no hesitation even to a female spy who is a novice in erotic experience!
A young female body with no resistance whatsoever to lewd attacks, she is... With her utterly ignorant sexual knowledge, will Mashiro be able to successfully complete her undercover investigation...?
She transfers in as a student to investigate the true nature of a school rife with dark rumors, engaging in espionage.
However, the school's educational scenes seem strange...
It appears that only lewd content unfolds, and she is unwillingly forced to learn about sex firsthand.
Finally, she is subjected to unreasonable punishments...
As she repeats her daytime school life and nighttime undercover investigations, the female spy's body undergoes lewd development, and these lewd sensations begin to follow her even in her daily life...
At this rate, her body will be ruined by sexual arousal before she can expose the evil deeds... She must do something before her true identity is revealed!

Clone Yourself and Get Girls into a Knot! Use Sex Ed to Train Them in BDSM and Do Whatever You Want
The concept of chastity has been turned on its head, transforming the world into one where girls are eager to have sex with men!
In this world, it’s perfectly acceptable to have sex with students as part of sex ed. In fact, getting them pregnant is the best outcome!?
A man who becomes the sex ed teacher spends his days getting his students pregnant. Then a transfer student arrives—a girl who, despite her innocent appearance, is actually a masochistic slut who thrills on BDSM training! Make her experience her first period, then keep breeding her until she gets pregnant!

“Hey, big brother… what does masturbation feel like?”
One day, my slightly introverted younger sister suddenly caught me off guard with that question.
Usually quiet and not one to socialize, she stared intently into my eyes, her gaze harboring an uncontrollable sense of “curiosity.”
A casual question taken lightly at first. Yet, that very conversation would drastically alter the distance between us.
Time spent together in the quiet room. Our eyes meet, words fade away, and before long, the atmosphere between us gradually transforms into something sweet, yet dangerous…

You and your co-worker Nanako have always had a bitter rivalry. Finally, on the order of your boss, you two have to cooperate for once. What bottled up feelings will this predicament reveal? Will it reignite your long-lost feelings for her? Where did it all go wrong between you and her? And how will she eventually help you to reconnect what you've lost in touch with: that there is more to life than just being a productive workaholic?