I stood there for a moment, catching my breath as Isabella greedily licked the last stray drops of cum from her lips. She was completely intoxicated, her crimson eyes blown wide, her tail swishing lazily against the hardwood floor.

"You know, Master," a deadpan voice echoed from the corner. "If you break your new demonic toy on the very first day, the World’s Will does not offer refunds."

I looked over my shoulder. Sol was floating there, her arms crossed. But instead of her usual indifferent expression, there was a faint, predatory gleam in her glowing eyes as she looked at Isabella’s naked, shivering body.

"Jealous, Sol?" I smirked, casually tucking my half-soft dick back into my pants and leaving the zipper down. "You’ve been awfully quiet while she was doing all the work."

Sol tilted her head. "I am a system administrator, Master. I observe and optimize. Though... I suppose practical data collection wouldn’t hurt. Especially since her stats are currently plummeting from the soul severance. She needs a proper calibration."

Before I could say another word, Sol’s semi-translucent, ethereal body began to glow brightly. The holographic projection solidified, taking on real physical mass. Her pristine white dress shifted, altering its form until she was wearing nothing but a sleek, form-fitting black corset.

And strapped directly to her waist was a massive, glowing golden dildo—a physical manifestation of pure, condensed system mana. It was thick, veined, and easily matched my own size.

Isabella blinked, her brain struggling to process the sight of the girl suddenly packing a massive, glowing cock.

"Get on the desk, demon," Sol ordered, her voice losing none of its robotic calm, though the command brooked no argument.

Isabella looked at me for permission. I gave her a sharp nod. "You heard her. Up."

The succubus scrambled up from the floor, her small leathery wings fluttering as she climbed onto the heavy mahogany desk. She got onto her hands and knees, sticking her plump, perfectly shaped ass high in the air. Her soaking wet pussy was practically dripping onto the polished wood, her folds swollen and bright pink from the orgasm I’d just given her.

I walked up right behind her, gripping her thick hips. I didn’t bother with foreplay—she didn’t need it. I pulled my cock back out, fully hard again, and aligned the blunt head with her slick, dripping entrance.

With one brutal, fluid motion, I slammed my hips forward, sinking to the hilt.

"AGHHH!" Isabella threw her head back, screaming at the ceiling as my thick cock ruthlessly stretched her tight walls.

"Fuck," I groaned, my fingers digging viciously into her ass cheeks.

This was why succubi were the most sought-after slaves in the realms. The moment I entered her, it felt like her pussy was alive. The internal walls were impossibly hot, rippling and contracting around my shaft with a ribbed, velvety texture. Her muscles naturally clamped down, massaging the head of my dick with every micro-movement.

"M-Master... so deep!" she whined, her hips instinctively pushing back against me to take more of my length. Her long, spade-tipped tail whipped around, coiling tightly around my thigh to anchor me to her.

"We are not done," Sol stated calmly.

Sol stepped up to the front of the desk, right in front of Isabella’s face. The glowing, golden strap-on was pointed directly at the succubus’s mouth.

"Open," Sol commanded.

Isabella, completely overwhelmed by the ruthless pounding I was giving her from behind, obediently opened her mouth. Sol grabbed the back of the demon’s head and forcefully shoved the thick, glowing dildo deep past her lips, gagging her instantly.

"Mmphhh!"

"Let’s see what that demonic throat can handle," Sol said, gripping Isabella’s hair and starting to ruthlessly fuck her face.

The spit-roast was perfectly synchronized. Every time I pulled out, dragging my cock along her sensitive, gripping walls, Sol slammed the strap-on deep down her throat. Then, as I violently thrust back into her slick, wet cunt, Sol pulled back. Push and pull.

SLAP! SLAP! SLAP!

The sound of my groin slamming against her plump ass cheeks echoed like gunshots in the office, perfectly accompanied by the wet, gagging slurps coming from the front.

Isabella was in pure, unfiltered agony-laced ecstasy. Her demonic body was pushed to its absolute limits. I reached around to the front, grabbing a handful of her massive, bouncing tits. I squeezed them brutally, pinching her hardened nipples while I fucked her from behind.

"Use your skills, you slut!" I growled, slapping her wet ass cheek with a resounding smack. "Show me why the Demon King made you!"

Isabella’s muffled shrieks vibrated against Sol’s strap-on. Her crimson eyes flared with dark magic.

Suddenly, the heat inside her cunt skyrocketed. Her internal walls began to frantically milk me, contracting in a chaotic, desperate rhythm that practically sucked the soul out of my dick. Succubus pheromones flooded the room, a thick, intoxicating scent that made my blood boil and my thrusts even more violent.

"Her core temperature is rising," Sol noted clinically, even as she aggressively fucked the demon’s mouth, her golden strap-on slick with succubus saliva. "Her pain-to-pleasure conversion is highly efficient. Keep pounding her, Master."

"Take it, you fucking whore," I snarled, completely giving in to the primal urge. I stopped holding back and just started hammering her cunt, completely lifting her hind legs off the desk with every thrust.

"MMMMGGGGHHHH!"

Isabella couldn’t even form words. Between Sol suffocating her with the glowing dildo and me destroying her pussy, she was reduced to a writhing, desperate animal. Her wings flapped wildly, knocking papers off the desk. Her tail tightened around my leg like a python, dragging me deeper inside her.

Her demonic stamina was terrifying. Any human woman would have passed out five minutes ago, but Isabella was just getting started. She began to actively push back against my thrusts, throwing her heavy ass back onto my dick while perfectly swallowing Sol’s strap-on to the hilt.

"She’s close," Sol said, her deadpan voice finally showing a crack of genuine amusement. Sol grabbed Isabella’s small horns, holding her head entirely still, and began to violently face-fuck her, matching my brutal pace from behind.

Squish... Slap! Squish... Slap!

"Cum," I ordered, my thumb reaching down to aggressively grind against her soaked, swollen clit. "Cum for us, you demonic bitch!"

That was all it took.

"GGGYYYAAAAAHH!" Isabella shrieked around the strap-on.

Her entire body seized. Her pussy clamped down on my dick with the force of a hydraulic press, her inner walls spasming wildly as a chain-reaction of orgasms ripped through her. She squirted violently, soaking the polished mahogany desk in a literal puddle of her sweet nectar.

The intense, milking grip of her climax pushed me straight over the edge.

"Fuck!" I roared, gripping her hips and driving myself as deep as I physically could.

I blew my load instantly, thick jets of hot cum painting the absolute deepest depths of her demonic womb. I pumped every single drop into her, groaning as her tight, quivering walls practically massaged the semen out of me.

At the exact same time, Sol dragged the glowing strap-on out of her mouth, leaving a thick trail of saliva.

Isabella collapsed onto the desk, completely broken. Her limbs were sprawled out, her ass still suspended in the air, heavily leaking my cum mixed with her own juices down her inner thighs. Her wings lay flat, and her tail uncoiled from my leg, dropping limply to the floor. She lay in a pool of her own fluids, gasping for air, her crimson eyes completely rolled back in absolute, mind-shattering bliss.

I slowly pulled out, letting out a long breath as my boots hit the floor.

Sol dissolved the strap-on back into digital particles, her physical form flickering slightly before she reverted to her semi-translucent, floating state. She adjusted her pristine white dress, looking completely unfazed.

"Data collection complete," Sol said dryly, looking down at the ruined succubus. "I rate her performance an 8.5 out of 10. She lacks discipline, but her hardware is... adequate."

I zipped up my pants, looking at Isabella’s twitching, cum-filled body sprawled across the professor’s desk.

"Adequate?" I chuckled, wiping a bead of sweat from my forehead. "Yeah. I think keeping her around was definitely the right choice."