Mahouka Koukou no Rettousei - Chapter 4Volume 30 -

An otaku with a hobby of masturbating was reincarnated as the son of a great mage.

As soon as he was born in this life, he vowed with a goal of embracing women till his death.

That said, when he became 20 years old, the Demon Lord which was sealed by his ancestors revived, and now it is his role to seal it once again.

And that demon lord is sealed in a tower dungeon that is rumored to be impossible to capture.

However, by an unexpected coincidence, he had found out that the Demon Lord is also one of him, a kindred spirit from within,

so he joined her instead and filled several traps in the tower dungeon, and thus they enjoyed a s*x spree with all the women coming over!

One day, Luo Jian woke up from his sleep and found himself in a locked chamber where the door and window were all sealed. A note with a few lines written on it was tacked to the wall: “Escape from this room within an hour, otherwise, you will die.”

There is a sequel called Reincarnation Night (轮回之夜) that takes place in the same universe but has different main characters

- Description from Novelupdates

Bai Xiao descended, lifting his head to not only see the bizarre and magnificent world but also the professional modifier he had downloaded before crossing over.“Drain all experience from my sub-occupations, 'Biological Mecha Master', 'Mystic Explorer', 'Special Hypnotist', transforming it into one million potential points, all enhancing my main occupation, 'Fighter'!”“I... have obtained the golden ultimate occupation, 'God of Martial Combat'!”The largest urban agglomeration in the world, a night of torrential rain.On the ground, countless Killing Ghosts and Fighters fought to the death, while hordes of metal Mechas and Biological Armors exploded and self-destructed. Blood and flame intertwined, plunging everything into primordial violence and chaos.Atop a high tower, Bai Xiao stood silently amidst the rainy darkness, like a stiff and terrifying statue. His crimson eyes looked down below, restrained yet bloody, cold yet hiding madness.He leaped down with his trench coat wildly dancing.The God of Martial Combat descended upon the final battleground!A cold voice echoed across the city skyline.“Next, I will kill everyone present! If you have the ability, try to stop me...”A modern city of extravagant luxury, an era of entertainment and consumption supreme.Beneath seventy years of peaceful façade, lied another mad and bloody Inner World.Fighters, masters of their martial traditions, and Killing Ghosts, controlled by combat modes, engaged in a frightful, relentless slaughter.Metal Mechas with terrifying energy and Biological Armors extracted from monstrous cells commenced a brutal struggle between old and new technologies.In this era infested with machinery and altered by external entities, to proclaim the power unique to humans might be an unimaginable romance...

The clock struck midnight when Ruelle heard the echo of footsteps. She tensed, the fine hairs on the back of her neck standing on end in the cool night air.“You shouldn't be here,” Ruelle whispered, her voice a breathless murmur. The silhouette finally came to stand under the moonlight, his dark red eyes watching her and his inky black hair ruffling.“Shouldn't I?” His voice was a dark caress, and she stood there captivated by the danger he exuded like perfume.“I haven’t seen you for the last two days,” his tone low. His hand reached out, fingers brushing against the silk of her nightgown, tracing the trembling outline of her collarbone. “Tell me, were you avoiding me, or perhaps... entertaining other offers?”Ruelle’s heart raced, her breaths shallow. She declared, “I don't belong to anyone.”“A bold claim,“ he murmured, his breath a tantalising chill against her skin as he leaned in. ”Yet here you are, pulse racing, your body tensed as if in anticipation of my touch.”His fingers gripped her chin, tilting her face towards his. The moonlight caught his eyes, revealing a glint of predatory intent. “Or must I remind you whose touch you truly crave?”