In the scorching depths of Hell, a immortal demon known as Cyn had gained the highest honor bestowable to a succubus. Year after year, she had earned her place as lead temptress, luring countless souls into damnation with her irresistible charms. Satan himself took notice of her unparalleled talents.

“Cyn, you lusty demoness,” the Devil purred, his voice dripping with appreciation. “You have served me well, corrupting the living and sating their sinful desires. I shall reward your supreme accomplishment.”

Cyn knelt before the throne, her crimson skin glistening in the sulfurous fumes. “I am forever your humble servant, my Lord. Command me.”

The Devil’s forked tongue flicked across his lips. “Rise, my child. You shall be granted a divine gift beyond mortal comprehension.” He produced a shimmering vial from the folds of his black robe. “Drink, and embrace your true potential.”

Cyn accepted the vial with a shaking hand. The liquid within swirled with mesmerizing patterns, beckoning her to consume it. She uncorked the vial and tilted it back, gulping down the burning contents. Instantly, her body convulsed in ecstasy as the power coursed through her veins.

When the sensation subsided, Cyn stared at her reflection in a polished hellfire mirror. Her voluptuous form had transformed – where once only female assets adorned her frame, now the anatomy of both genders intermingled in a seductive dance. She gasped in delight at her new duality.

“Now, you may shift between male and female at your desire,” the Devil declared. “No one will be safe from your lures. You are free to exploit all, regardless of gender, and fill them with your unholy seeds. The world of the living shall be your playground.”

Cyn’s eyes gleamed with malice and lust. “Thank you, my Lord. Your generosity will not go unappreciated.” She ascended in a burst of dark flame, ready to embark on her infernal mission.

From that day forth, Cyn traversed the mortal lands, reveling in her newfound power. Both men and women fell helplessly in thrall to her ravenous appetite for seduction. She reveled in each conquest, savoring their cries of rapture and despair as their lives were forever defiled. And with each coupling, she spawned new demons, swelling the infernal ranks.

As legend of her insatiable sins spread, Cyn became a whispered terror. Mortals shuddered at tales of the androgynous fiend who preyed on all. But she cared not – for now, all of creation was hers to corrupt, and her legacy of damnation would endure for eternity. And in Hell’s deepest pits, the Devil grinned in satisfaction, sipping from a goblet of blood as he surveyed his most devoted servant’s handiwork.