Demonic Dragon: Harem System - Chapter 346: Horny Dragons (R-18)

A scientific genius named Thomas Harrier was transmigrated to an imperial prince body after a car accident that took his life. He found out that he is in a world similar to our own with a timeline akin to early twentieth century. The body that he is occupying was the imperial prince of a failing empire who suddenly rose to power after a successful assassination attempt of his father. Unaware that the attack is just the beginning of what is to come. He faces many challenges throughout. Will Thomas Harrier be able to live his second life in peace while running an empire and getting it back to its former glory? Or will he succumb into a conspiracy lurking within the country's borders?

Expect some:

Cold war era techs.

Super battleship with advanced electronics, propulsion, and fire control systems?
Helicopters?
Missiles?
Modern medicines and equipment?
AC-130?
A nuke?
Challenger or Abrams or Leopard?
F-4 Phantom or MIG-21?
Colored TV's.

Everything!!!

PS. Cover not mine, I just found it on google.

Su Xiao is a cold-blooded teenager who’s seeking vengeance for the death of his family, yet things ended up badly for him.

As he was taking his last breaths, he heard a voice calling him from dimensions, it was a strange system reaching him, asking him if he wanted to be saved, to be Reincarnated.

He just needed to accept a contract, Su Xiao didn’t have any choice but to do so, but he didn’t know what he signed up for!!

Traveling through worlds, doing extremely dangerous missions, collecting special items, leveling up, and even killing Protagonists…

But Su Xiao wasn’t any ordinary Contractor, Su Xiao was a Hunter!

The MC crosses over to: One Piece, Tokyo Ghoul, Naruto, Fullmetal Alchemist, Attack on Titans…

- Description from Novelupdates

[Ding........ ][System Binding.......][10%..........][20%..........][40%..........][60%..........][80%..........][100%........][ Congratulations, Host! The Strongest Family System has been bound! ]----------------------------“Huh? I’ve transmigrated…” Arthur muttered, his voice barely above a whisper as he surveyed his bewildering new surroundings. Confusion washed over him like a tidal wave.-----------------------------Arthur was just an ordinary corporate worker, an overworked cog in the relentless machine of corporate life.After seven grueling days of nonstop overtime, his body finally gave out, collapsing right before his computer screen at home.He thought that was it; he thought he was dead. But little did he know, fate had something extraordinary in store for him.Instead of fading into oblivion, Arthur found himself thrust into a vast and unfamiliar world, one ten times larger than Earth itself!To his astonishment, he had become the head of the Osborn family, a once-mighty lineage now teetering on the brink of destruction.Bound by the standard configuration for all transmigrators: The System which is the [Strongest Family System ], Arthur faced an epic challenge: to transform the faltering Osborn family into the most powerful dynasty in existence.Join Arthur on this thrilling adventure as he navigates treacherous waters filled with intrigue, power, influence and danger.Can he lead a declining family back to glory and secure their place at the top?

Wen Qing was pulled into an infinite flow game, and after struggling through the first instance, he received a strange buff.

System: 【 All non-human beings will have a good impression of you. PS: ***** 】

Wen Qing asked cautiously: ”What do the asterisks mean?”

System: 【 It means ***** 】

The blocked words are definitely not good at all!

Wen Qing cried: ”Can I refuse this weird buff?”

System: 【 The highest-end hunters often appear in the form of prey. 】

Wen Qing choked. ”Am I the highest-end hunter?”

System: 【 You are the most delicious prey. 】

Wen Qing: ???

- Description from Novelupdates