Novels like Primordial Villain with a Slave Harem

All share Harem

Demonic Pornstar System

Same author, also Weaktostrong and R18

My Scumbag System

Also Transmigration and Weaktostrong

Limitless Evolution As a Snake

Also Transmigration and Weaktostrong

Online Game: I Have A 100% Drop Rate

Also Transmigration and Weaktostrong

My SSS-Rank Innate skill: Infinite Adaptation core

Also Transmigration and Weaktostrong

Pervert In Stone Age: Breaking Cavewomen with Modern Kinks

Also Transmigration and Weaktostrong

Void System: Every Heroine Makes Me Stronger

Also Transmigration and R18

Invincible Beyond Heavens: Cultivating With A Broken EXP System

Also Transmigration and Weaktostrong

One SSS Affix per Level: My Novice Club Can Slay Gods!

Also Transmigration and Weaktostrong

I Can Get 1,000,000x Returns from Selling Anything!

Also Transmigration and Weaktostrong

The Heroines Can Hear My and the Protagonist’s Inner Voice!?

Also Transmigration and R18

The Corruption Dragon God: Lust System

Also Transmigration and Weaktostrong