Kai adjusted the straps of his black shirt rolling his shoulders as the system's power coursed through him. His body felt different — lighter, faster, coiled with raw strength that begged to be unleashed. His vision sharpened, every sound in the Guild's dungeon hall echoing with clarity. The boost wasn't just physical. His instincts had sharpened too, a predator's hunger simmering beneath his skin.
Gladis and Gladiator were waiting near the entrance. Gladiator stood firm, sword strapped across his back, towering like a mountain of muscle. Beside him, Gladis wore tight, silver-lined leather armor that clung to her curves. Her smirk said she hadn't forgotten the way Kai had fucked her into submission days ago.
"You're late," Gladiator grunted, though his tone was more respectful than before.
Kai smirked. "I had to stretch. Didn't want to embarrass you two when I leave you in the dust."
Gladis chuckled, licking her lips as her eyes ran over him. "Cocky as ever. But I like it. Let's see if that body of yours is good for more than just breaking women."
Kai leaned close, whispering just for her: "You'll find out tonight, sweetheart."
Her thighs pressed together instinctively, and Gladiator rolled his eyes. "Let's just go."
The three of them entered the glowing dungeon gate. Light swallowed their bodies, and in an instant they were transported into the depths of the Lower Dungeon.
---
The air inside was damp and heavy, carrying the scent of moss and blood. Stalactites hung from the ceiling, dripping water that echoed in the silence. Dim blue torches flickered along the stone walls, their flames unnatural, powered by dungeon magic.
Kai inhaled deeply. His Dungeon Sense activated instantly — the world seemed to hum, threads of invisible energy pulsing beneath the ground and walls. He could feel movement far ahead, like heartbeats in the dark.
"Goblin pack. Six of them. Twenty meters east," he said casually.
Gladis froze, eyes widening. "Wait… how the fuck do you know that? We haven't even scouted yet."
Kai smirked. "Call it instinct."
Gladiator grunted. "Fine. But if you're wrong, you're on point."
Kai drew the short sword strapped to his side, though already he felt his body vibrating with speed. The trio moved down the twisting tunnel until the stench of goblins hit them — piss, rot, and blood.
The creatures appeared from the shadows, yellow eyes glowing, crooked teeth snarling. They were short, twisted things with crude daggers and spiked clubs.
"Mine," Kai growled, stepping forward before Gladis or Gladiator could react.
The first goblin shrieked and charged. Kai vanished. One blink, and he was gone — only to reappear behind the creature, his blade slicing through its throat in one clean motion. Blood sprayed, painting the wall.
Gladis gasped. "Holy shit… he's fast!"
Two more goblins lunged, but Kai's body blurred, moving like a phantom. His sword punched through one chest, his knee shattered another skull. Both fell twitching before they could even scream.
By the time Gladiator swung his heavy blade, only one goblin was left — trembling, backing away, its piss dripping onto the floor.
Kai grabbed it by the neck, slamming it into the wall. "Pathetic," he snarled, before crushing its skull with one brutal punch. Bone and brains splattered across the stones.
Gladis was breathing heavy, not from the fight, but from watching him. Her eyes burned with heat as she stepped closer, whispering: "Fuck… Kai… the way you move…"
Kai grinned darkly. "Wait till you see what else I can do."
Gladiator cleared his throat. "Focus. That was just goblins. Beasts are deeper in."
---
Hours passed as they descended deeper. Kai led them easily, Dungeon Sense guiding them through hidden passages, avoiding traps, and finding caches of glowing crystals that Gladis greedily collected. His strength made the journey effortless — where Gladiator grunted swinging his sword, Kai tore through monsters with his bare hands, ripping jaws apart, crushing rib cages, turning enemies into blood mist.
But it wasn't just the fighting that left Gladis shaken. Every time Kai looked at her, smirking with blood dripping down his arms, her pussy clenched.
During a short rest in a hollow cavern, she couldn't resist anymore. She sat next to him, close enough that her thigh brushed his. Gladiator busied himself sharpening his blade, pretending not to notice.
Gladis leaned in, whispering: "Kai… I can't stop thinking about the way you fucked me… I need more."
Kai's grin was wicked. He grabbed her by the hair and yanked her head back, forcing her to look up at him. "You're in heat again already? Pathetic slut."
She whimpered, thighs squeezing together, juices dampening her armor beneath. "Y-yes… please…"
Kai pushed her down onto the cavern floor, uncaring that her brother was just meters away. He yanked off her armor chest piece, freeing her breasts. Her nipples were stiff, begging for his mouth. He bit one hard, making her cry out.
Gladiator growled, but didn't interfere. He kept sharpening his blade, jaw tight, pretending he couldn't hear his sister moaning like a whore.
Kai's cock slid out of his trousers, hard and throbbing. He slammed into her pussy without warning, stretching her tight walls instantly.
"AHHHH!" she screamed, nails digging into the stone floor.
"Shut up," Kai growled, covering her mouth with his hand while pounding her mercilessly. Pah! Pah! Pah! The sound of flesh echoed through the dungeon.
Her body squirted around his cock, juices soaking the ground, dripping down his balls. She writhed beneath him, eyes rolling back, choking on her own muffled moans.
"You're mine in battle, mine in bed," Kai snarled, biting her neck. "Say it."
She nodded frantically, tears streaming from the overwhelming pleasure.
When he finally exploded inside her, filling her pussy with hot cum, she nearly passed out, body twitching violently.
Kai stood, smirking down at her ruined body. Then he glanced at Gladiator. "You gonna say something, or just sit there pretending not to hear your sister scream my name?"
Gladiator's grip tightened on his sword… but he stayed silent.
Kai laughed darkly. "That's what I thought."
The system chimed in Kai's head:
Dungeon synergy achieved. Trait unlocked: Predator's Aura – weak monsters will cower in your presence, reducing their strength.
Kai smirked, pulling Gladis up by her hair, cum dripping down her thighs. "Looks like I'm only getting stronger. Time to hunt something bigger."