Writersblockills

After slumbering for years in the darkest pits of the abyss, Haruki Shin is awoken by the demon lord of lust. She tries to remind him of a contract he signed with her in exchange for the power that would help him exact his revenge in the mortal world.
However, who or what he wanted to get revenge on? He couldn’t remember. Replaced with a hazy mist, his memories had long since faded. But to the mistress of lust that didn’t matter as she forced him back into the mortal world with the demonic body of an incubus. 
Feeling lost he’s forced to adhere to each of her commands, and despite his refusal, he can’t resist the binds of the contract. Eventually, however, as he learns more about his tragic past, and the existence of the lustful system he’s been blessed with for his revenge, his path to becoming a monster finally begins.

[Warnings]:
Sexual content||Gore||Traumatic sequences||Mention of slavery and other heinous crimes||Step-relationship||Genderbending|| 

[Note]:
1. None of the heroines will cheat on MC
2. Does involve MC stealing other people's partners
3. Please let me know about any grammatical errors in any chapter through the comments.
4. MORE GOLDEN TICKETS = FASTER UPDATES!
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Absolute Depravity: Reincarnated with a lustful System

"Aghhhh!" Her insides parted in two for the very first time, Medusa couldn't help but groan out loud.

Already deep inside her flesh, Haruki's manhood was enveloped in a comforting cold. Unlike any woman he'd been with, Medusa's body was gushing with cold blood, and yet her slimy insides gave off a brain-melting sensation unlike any other.

"Mhmm! Stop!" Panting restlessly, Medusa began to try and flail around her tail, but being bound by holy chains she couldn't move all that much.

"Shut up," placing a finger on Medusa's lips, Athena decided to use one of her abilities to shut her entirely. "Queen's lock."

Chapter 213 - The Lamia Queen’s Body[18+]