The sound of honking cars and shattering glass was the last thing he heard.
Pain shot through his body as his vision went dark, blood pooling beneath him on the cracked pavement. He didn't even have time to scream.
"So this is how I die? Hit by a damn truck… like some joke in a novel?"
He wanted to curse, but his lips refused to move.
The world faded. Silence.
Then—
A voice whispered inside his mind. Cold, seductive, and inhuman.
> [Welcome, chosen vessel. Initializing the Forbidden Lust System…]
His body twitched. A burning heat spread from his chest, rushing down to his stomach and groin like molten fire.
He gasped as light exploded around him.
When he opened his eyes again, he wasn't on the street anymore.
He was lying naked on a stone floor, chains clinking in the darkness. The air smelled of moss, damp rock, and something metallic… blood.
He sat up, clutching his head.
"Where… the hell am I?"
The chamber was dim, torches flickering along the walls. Strange runes glowed faintly, and far in the distance, he could hear growls.
Before he could think further, a translucent blue screen appeared before his eyes.
---
[The Forbidden Lust System has chosen you.]
[Mission: Survive the Dungeon of Origin.]
[Condition: Absorb Lust Energy to evolve.]
---
He blinked. "Lust… energy? What the fuck?"
A metallic clink echoed to his right. He turned and froze.
A girl.
An elf, chained to the wall, her silver hair messy and her emerald eyes half-lidded with exhaustion. Her torn clothing barely covered her pale, flawless skin. She looked weak, close to collapsing.
Her lips parted, and she whispered, voice trembling:
"P-please… h-help me…"
Before he could reply, the system's cold voice returned.
---
[First target detected.]
[Tutorial: Engage in carnal contact to awaken your first evolution.]
---
His jaw dropped. "You've got to be kidding me."
The elf's chains rattled as she tried to move. Her gaze locked on him, a strange glimmer of both fear and desperate need in her eyes.
"Please… I can't… I'm burning inside… help me…"
Heat surged through his body again, his pulse racing. His cock stirred to life, hard and throbbing, as if the system itself was controlling his lust.
The screen flashed.
---
[Warning: If Lust Energy is not absorbed within 10 minutes, Host will die.]
---
"Die?! Are you fucking serious?!"
The elf girl whimpered, her thighs pressing together as her torn clothes slipped further, revealing the swell of her breasts.
His chest heaved. His mind screamed at him to resist, but his body… his body craved her.
The system whispered again, like a devil in his ear:
[Accept her. Claim her. Evolve.]
He swallowed hard, moving toward her as her chains rattled. Her lips trembled, but she didn't resist—instead, she arched her back, offering herself to him.
"P-please…" she whispered again, eyes pleading.
And in that moment, he made his choice.
The elf girl's trembling breath filled the chamber, her chains rattling softly as her emerald eyes fixed on him. Her voice was weak, hoarse, yet dripping with desperate need.
"Please… release me… my body is burning…"
His pulse hammered. The heat within him, ignited by the system, was unbearable now. His cock stood hard, throbbing, aching to be buried inside her.
The glowing blue screen flickered before his eyes:
---
[Tutorial Mission: Absorb Lust Energy from the target.]
[Time remaining: 6 minutes, 44 seconds.]
[Warning: Failure will result in Host's immediate death.]
---
"Damn it…" He clenched his fists. So either I give in, or I die here.
The elf arched her back, her torn clothing falling away to reveal pale, perfect skin and the gentle curve of her breasts. Her nipples hardened as the dungeon's cold air brushed over them, but the blush on her cheeks and the wet sheen between her thighs betrayed a deeper truth.
She wasn't just chained. She was enchanted—her body enslaved by some curse of lust.
The system whispered again, dark and persuasive:
> [Take her. She is yours. Through desire, you shall evolve.]
His last hesitation shattered. He stepped closer, placing a hand against her soft skin. The elf gasped, her body trembling at the simple touch. Her lips parted, a whimper escaping as if his hand alone sent jolts of forbidden pleasure through her.
"Y-you… you're warm…" she whispered.
Her chains clinked as he leaned down, his lips brushing against hers. At first, it was soft—hesitant—but the moment their tongues met, the System pulsed.
---
[Lust Energy Acquired: +15]
[Host evolution in progress…]
---
The kiss grew hungrier. His hand slid down her body, exploring every curve, every soft spot that made her whine. When his fingers brushed between her thighs, slick heat welcomed him. She moaned into his mouth, hips grinding helplessly against his touch.
"Ahh… no… it feels too good…"
The chains rattled wildly as she writhed against him, but there was no resistance—only desperate need.
He tore the last scraps of cloth from her body. She was flawless: creamy thighs, a tight pink slit glistening with arousal, her chest rising and falling with each trembling breath.
He positioned himself between her legs. For a heartbeat, he hesitated again… but the system's countdown flashed mercilessly.
---
[Time remaining: 3 minutes, 12 seconds.]
---
With a groan, he thrust forward, burying himself deep inside her tight, wet heat.
The elf screamed—half pain, half ecstasy—as her body clamped around him. Her chains rattled violently as her back arched, her breasts bouncing with each desperate gasp.
"Ahhh! N-no… it's too much… it's too deep!"
Her cries only drove him harder. He grabbed her hips and began thrusting, his cock stretching her, plunging into her over and over until her whimpers turned into moans of shameless pleasure.
The system pulsed with every thrust.
---
[Lust Energy +25]
[Lust Energy +35]
[Evolution Threshold Approaching…]
---
Sweat dripped down his back as their bodies crashed together, the sound of wet flesh echoing in the chamber. The elf's thighs wrapped around his waist, pulling him deeper, as if her cursed body had accepted its fate.
"D-don't stop…! Please… don't stop!" she begged, tears of bliss shining in her eyes.
Her walls clenched around him tighter than ever, her body convulsing as her climax hit.
"Ahhh—!"
The sudden squeeze drove him over the edge. He growled, thrusting one final time before spilling his hot seed inside her.
---
[Lust Energy Acquired: +100]
[Tutorial Complete.]
[First Evolution Achieved!]
---
His entire body burned with light. Muscles tightened, bones strengthened, and raw vitality surged through him. His senses sharpened; even the faint dripping of water on stone felt clear as thunder.
The system chimed again.
---
[Host Evolution: Stage 1 Complete.]
[New Ability Unlocked: Carnal Absorption.]
[Description: Sexual climax with any partner allows Host to drain stamina, mana, and energy for personal growth.]
---
He gasped, his chest heaving, his cock still buried in the trembling elf who clung to him weakly, panting, her eyes glazed with lingering pleasure.
"…I really did evolve…" he muttered, staring at his now-firmer hands, feeling raw power coursing through him.
But the system wasn't finished.
[Warning: Dungeon monsters are approaching.]
[Protect your partner, or lose her.]
The elf's eyes widened in terror. In the darkness beyond the torches, growls echoed—deep, hungry, and drawing closer.
He clenched his fists, a savage grin forming.
This world had forced him to change. Forced him to take what was forbidden.
Now he had power… and he wasn't going to stop.