The Demoness Cultivation Plan

[I've been a demonic maiden before-this isn't based on assumptions or written at random.]

[Gender Bender + Hardcore Immortal Cultivation + Mildly Bizarre Premise + Slow Burn + Plot-Driven]

In this world, mechanical arts are highly advanced. Every cultivator embarks on the Dao through puppetry, which means cultivation costs a fortune.

Lu Li arrives from another world without a penny to his name. He swears to resist spending beyond his means and never let immortals fleece him. Even if it kills him, he won't borrow so much as half a spirit stone.

Absolutely not!

Until-he meets an old granny living inside a ring. From then on, he mortgages his blood, bones, flesh, skin, and internal organs to fund twisted modifications to his body, falling onto the demonic path...

Mortgage his skin, take out a loan for Azure Nether Painted Skin-"Bro, your skin is so fair."

Mortgage his skeleton, take out a loan for Glazed Jade Bones-"Bro, you've got such a petite frame."

Mortgage his hands, take out a loan for Sumeru Puppet Hands-"Bro, your hands are so small. Let's compare sizes."

Mortgage his vocal cords, take out a loan for a Beguiling Voice Box-"Bro, your voice sounds amazing... Wait, bro, you're a girl? Get out!"

P.S. Also known as The Demonic Maiden Development Plan.