[FAT] How I, Who Caught the Eye of a Succubus, Lost My Humanity and Drowned in Lust [Full Color] {darknight}

A bespectacled student catches the eye of a ravenous succubus, and being chosen turns out to be the worst luck of his life. She and a black-haired sister in lust pin him down for a merciless femdom draining, wringing climax after climax from their virgin prey until he gasps that he's 'come so much' and begs to know what he's becoming. By the end his humanity is spent entirely, leaving a collared demon girl with bat wings, a lewd crotch tattoo, and a heart-shaped tongue eager to drown in lust at her mistress's side.