Kyoukai Senjou no Horizon - Volume 2, Chapter 11: Groups of National Leaders

A man who was once called the world’s strongest agent ended up becoming a teacher after his retirement, to train a new generation of agents. After many years of training his disciples, he was killed at the age of 60 by a secret organization’s ruse and was reincarnated in another world with his memories intact. Though he was surprised by the existence of magic and the strange species in that world, he quickly adapted to his condition as a newborn and took advantage of it. He acquired special magic and gained a massive amount of strength thanks to his rigorous discipline, in order to reach his goal: Resume his career as a teacher which he left halfway through in his previous life. This is the story of a man, who, based on the memories and the experiences of his previous life, became a teacher who travels through the world with his students.

[Warning: Mature Content]

“Master, are we going to keep what happened last night a secret between us?”

“For how loud you moaned and cried, Qing-er, I think the whole world has already learned all about it, and your concern is irrelevant.”

Yun Qing-er, the only disciple of the legendary immortal swordmaster Bai Ye, has been hiding her feelings for her master for years. Unaccepted by norms and morals, it is the darkest secret that she swears to bury deep within her heart.

But life has other plans. Bai Ye's desire for her burns hot beneath his solemn appearance. He will teach her not only the art of the sword, but also the pleasures of life that she never knew existed before.

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Smut starts at Chapter 17, with a teaser in Chapter 11. A bit softcore at first but will get wilder quickly as the story moves on :)

Note that this is NOT a typical cultivation romance. Immortals and spiritual power and whatnot are all plot devices… You'll see what I mean in just a few chapters!

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[Sneak Peek]

He pinned me against the poplar tree at the center of the garden. A breeze rustled past, stirring the sunlight sparkling through the autumn foliage above us, and a sprinkle of gold fell over his shoulders. “Say you want me,” he whispered.

“Bai Ye—” I breathed, but the rest of my words were replaced by moans the moment he traced his kisses along my neck and took my earlobe into his mouth.

Familiar tingles roared through me as he nibbled and suckled gently. His hand slid up my chest, and he played with my sensations with his lips and tongue and fingers until my arms trembled around him. All other thoughts vanished from my mind. The only thing I knew was the irresistible feeling of him on me, so overwhelming that my knees started growing weak. I would've fallen if he wasn't pinning me hard against the tree.

“Bai Ye …” I moaned again, clawing at his clothes. “Of course I want you … Right here, right now.”

He let out a soft puff of laughter, and his hand grazed down, gripping the folds of my dress. With a rip of fabric, he tore them away.

Journey through the combined world of the Special Forces series and become the acknowledged bad soldier of the Iron Fist?

Don’t panic! The “Strongest Individual Soldier System” is here to help. Every time you upgrade a level, not only will your body be strengthened, but you can also acquire super skills. At the beginning, you will activate the S-level shooting skills, which will amaze the audience and overwhelm everyone! Thus, a vanguard that made the heads of state tremble was born…

He Chenguang: “Did you practice martial arts from the womb?”

High school team: “He is the scariest individual soldier I have ever seen, bar none!”

Lei Zhan: “It’s unlucky. In his hands, I’m like a three-year-old child. I can’t beat it! I can’t beat it!”

He Zhijun: “Xiao Lin, the future of Langya is in your hands, I will retire early!”

- Description from novelbuddy

A World of Warcraft hunter player inexplicably entered the world of Azeroth in his sleep. Turned into a high elf ranger, and at the same time inherited the title of Baron Cheap Daddy (Baron Blood Eagle) who died.

But the tragic original history that Blizzard bestowed upon the blood elves made his hair stand on end. He doesn’t want to become a heartbroken person and doesn’t want to die, so he can only struggle desperately to change the original history.

- Description from novelbuddy