The Blood Contract - Chapter 11: Powers

Aomori, who has a monster-fighting system, came to the world of One-Punch Man and gained the ability to enter various instances.

Therefore, “Founder of the Hero Association”, “NO. “And other titles fell on him one after another.

Comprehensive flow, the main world One Punch Man.

Completed dungeons so far: Pokémon – Demon Slayer – Sword – Pokémon – Digimon – Spell Return – Yokai Comprehensive World (Girls that Noragami Inuyasha can see, etc.) – Pokémon – One Piece-re0-Dragon Ball wait.

- Description from novelbuddy

Emperor Ian Veroshion, the first noble mage, was betrayed and executed. Cursed to never be reborn, he awakens a century later as the illegitimate son of a disgraced ducal line, destined to be a hostage in a barbaric land. Stripped of his magic and his throne, he must navigate a world vastly different from the one he ruled, facing political machinations and a resurgent monster threat. But the embers of his past life still burn, and Ian will not surrender his legacy. He will reclaim his name, his magic, and perhaps, even his empire.

[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.

He Lang died by his own hands for the sake of his imperial younger brother’s ambition, whom he loved. He was offered to be reborn in exchange for giving up his past romantic feelings. Reborn without the burden of his romantic feelings, he brings with him a manual to new worlds. He wholeheartedly followed the instructions of the manual to complete the tasks, not knowing that the originally slag gong was blackening…
He pleaded to his affectionate Emperor brother to release him, he pleaded to the paranoid prisoner next door, but until the end he remained baffled.
In the end, he discovered that the full name of the manual was – “Slag Shou Cultivating Manual”
Σ (っ ° ° °;) っ!

- Description from Novelupdates