Blackstone Code - Chapter 178:

[WARNING:FOR MATURE AUDIENCES ONLY]This is the story of how I made my own harem with the help of my step-sister.Anyway read 3 chapters yourself than decide yourself, if you wanna go further!!

There’s the so called class transfer.

Among the high school students that were given cheat abilities, Kirishima Ran was given 『Underling Training』for some reason, a skill that can make a woman a slave.

Ran who was driven out by the kingdom using an absurd reason will make use of the given skill freely to take revenge on his classmates, release his desires (This is mainly the reason), and fight off the world’s system.

It’s a story of him using his wonderful skill making his classmates turn to an obedient cute and lewd slave.

Victoria Garcia signed a slave contract, but accidentally fainted in bed!“Arnold Johnson, you are a monster! You said you could wait three years!” She complained!“I would be less than one if I didn't take an opportunity after it presents itself!”Then, on a certain night...“You're a scoundrel and a scumbag!” Xiu Xiangwan yelled on the verge of falling apart.“I could be worse if you dare to test me!”“...”Arnold Johnson is the second child of the Johnson family, one of the six top families of business magnates and owners of Johnson Holdings. Everyone says that he was affably evil and elegantly ruthless, and he was said to have seized an opening to engineer his own brother's death, hence inheriting Johnson Holdings!Victoria Garcia was the daughter of a family who now fell to dire straits, pawning herself off to Arnold Johnson to keep her mother out of prison...

Lyle Walt is a young noble boy and heir looking forward to the day he can inherit his family’s territory. Except around when he was 10 year old, his parents started neglecting him more and more in favour of his little sister, Celes.
On his fifteenth birthday, he is challenged to a duel by his sister to see who will inherit the household and horribly loses, being cast out of his family. Afterwards, he gets treated by the family groundskeepers and receives the family heirloom Gem from him that Lyle’s grandfather had entrusted to him. From there, he begins an aimless journey with his childhood friend and former fiancée, Novem, and the Gem-turned-Jewel that houses the memories, personalities, and Skills of seven of his ancestors.