Kyoukai Senjou no Horizon - Volume 1B, Chapter 30: Me at the Last Moment

Leiyin accidentally crossed into the One Piece World, and accidentally obtained the Naruto System.

[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.

The story begins as our female lead wakes up in a strange room and an unfamiliar body. She realizes that she has travelled back in time and her twenty-two year old spirit is now trapped in the body of a six year old girl. This girl child is the third daughter of Ning Guo’s Prime Minister Li and his seventh wife. Her name is Li Qing Luo and because her mother was originally from an entertainment house, Prime Minister Li and his other six wives treated them badly.

Her first day in that world, the whole family gathers to test the talent of the three daughters. Qing Lei, the eldest, is talented at playing the zither while Qing Fei’s calligraphy is incomparable. Everyone anticipates A’Luo’s failure as she had not exhibited any talent before, but that six year old child recites a famous Tang poem. The entire family is surprised that Qing Luo is able to write such a profound poem and her mother later tells her that Prime Minister Li is so harsh on his daughters because he needs to rely on them marrying well to secure his future. Qing Luo begins to study qin, qi, shu, hua (zither, chess, calligraphy, and painting) but hides her skill because she does not want to be sold in marriage to some prince or court official.

Six years later, A’Luo is now twelve and leaves the estate for the first time to participate at a flower viewing banquet. This is a special banquet because the Five Most Eligible Bachlors of Feng Cheng will be in attendance (there’s actually a more elegant name for them). These young men are: Crown Prince Liu Jian, Fourth Prince Liu Fei, the young An Qing Wang Liu Jue, the son of Prime Minister Gu Gu Tian Xiang, and the top scorer of the Imperial Examinations Cheng Si Yue. A’Luo sneaks off and almost falls into a river, but is saved by a handsome young man. Because he glanced at her bare legs a moment too long, A’Luo calls him a pervert, tries to push him into the river and runs off. The young man only laughs and vows to find her again.

- Description from Novelupdates

The older young Lisko woke up and found that he had become an American. He took over his father’s ranch and began to live in the United States.

- Description from novelbuddy