Harem Startup : The Demon Billionaire is on Vacation

Chapter 311 – Domestic Demons

The evening rolled in like warm silk over marble—soft light bleeding through the massive floor-to-ceiling windows of Lux’s mansion, gilding the halls with a rich honey-gold glow. The city outside shimmered faintly, but in here?

Chaos hummed beneath elegance.

Lyra and the servants had been buzzing for the last two hours. There were footsteps echoing through the gallery floors, faint laughter, a glass or two clinking somewhere in the distance. Scent of garlic and citrus, fresh herbs and fire-roasted meat filled the air like a dinner date with temptation itself. Ribbons of demonic sigils glowed above the hallway arches—minor illusions made to impress mortals, subtle enough to be called ambiance.

The prep for the housewarming party was in full swing.

His guests would arrive in two hours.

But Lux?

Lux was very much not in the kitchen.

Neither was Sira.

Because when two demons with far too much stamina and a chronic weakness for burning off calories in depraved ways found themselves bored in a mansion full of luxuries...

Well. The bedroom was right there.

And the door locked with a thought.

The air inside was steamy—not from heat, but tension. Desire. Scented candles that weren’t really necessary, but Sira insisted on burning anyway because ”atmosphere matters, darling.”

Lux’s white shirt had been discarded on the floor. Somewhere between the last kiss and the second grope, his belt had unbuckled itself like it had a death wish.

Sira was laughing.

Her dress had been hiked up above her hips, and she was on all fours on the velvet-topped mattress, hair tousled, glowing faintly with pride-tinged heat.

”You really couldn’t wait until after the party?” she teased, voice husky and smug.

Lux, shirtless, breathing hard, hands on her hips, grinned through a pant. ”You wore that red dress. Again. This is your fault.” He was behind her. His cock was inside her.

Her laugh was velvet. ”You said you liked it.”

”I like it when you’re not wearing it.”

He leaned down, brushing his lips along her shoulder, his hands exploring like a greedy cartographer mapping out a cursed treasure.

The rhythm of their bodies moved like war drums beneath silk sheets. Not brutal like the night before—no. They promised to stay civilized this time. A gentle demon’s agreement.

Still...

It wasn’t slow.

Or gentle.

Not when her breath caught like that.

Not when his grip tightened.

Sira turned her head slightly, strands of hair clinging to her cheek, and murmured between moans, ”I went to a mortal grocery store today.”

Lux blinked.

Mid-thrust.

”...What?”

She let out a breathless giggle. ”A mortal place. It’s called... Costo? Something like that.”

He paused just enough to catch his breath, face contorted somewhere between confusion and hysterical disbelief.

”You went to Costo?”

She nodded, very pleased with herself. ”Yes. It was... an experience. They all stared at me.”

”Sira,” Lux said, voice hoarse, still moving, ”you walked into Costo wearing a slit-up-to-your-sin-dress?”

”Yes.” Her voice was sing-song. ”I had heels too.”

Lux stopped again.

”You wore a backless high-slit red dress—to buy groceries?”

Sira pouted slightly, arching her back in a way that was definitely intentional. ”They didn’t have proper wine. I was disappointed.”

”Oh my hell,” Lux groaned, forehead dropping against her shoulder as his laugh shook through both of them. ”I’m shocked no one tried to offer you a loyalty card and a marriage proposal in the same breath.”

”They stared. It was fun.” She looked over her shoulder with that grin—half pride, half predator. ”I think one of them dropped a basket.”

”Poor bastard,” Lux whispered, biting her ear lightly. ”Probably saw God.”

They moved again, finding that perfect rhythm between sin and intimacy. The kind that only demons on vacation could perfect—lazy, possessive, burning hot and slow like a gold coin melting under candlelight.

Sira let out a breathless sound, the kind that tasted like victory.

”I bought you a gift,” she said.

Lux, already overstimulated in every sense of the word, blinked. ”...Now?”

”In the kitchen.”

He frowned through a pant. ”What is it?”

She smirked. ”A new coffee machine.”

Lux stopped.

Like—fully stopped.

”...You’re not joking?”

She shook her head, smug as ever. ”Nope. One of the machines had these blue flames and chrome plating. You should’ve seen the brewing power. It spoke to me. Said your name. I bought it.”

Lux inhaled like he’d just seen a limited-edition stock crash and bounce back in a single blessed instant. ”You—Sira. You bought me caffeine technology. While looking like a Pride-themed ad for sin inside Costo.”

”Yes,” she purred, her voice like velvet wrapping around fire. ”Do you love me more now?”

He kissed the back of her neck, slow and deliberate. ”You have no idea.”

She twisted back toward him, eyes blazing, lips curled.

”Then f*ck me harder.”

His smirk was sin itself.

”As you wish.”

And he did. Without hesitation. Without mercy.

Because this was what they were.

Demons.

Lust and pride in perfect collision.

Violent. Vain. Over-the-top.

Unapologetic. Addicted.

Two infernal forces tangled not just in flesh—but in something far more dangerous:

Power.

But weirdly domestic when they weren’t breaking bedframes.

Later, with skin still damp and hearts finally slowing, they lay on the bed. Lux on his back. Sira sprawled sideways over him, arm draped across his chest, her hair fanned out.

”You’re not going to fall asleep before your party, are you?” she murmured.

”Tempting,” Lux said. ”But no.”

”Because if you do,” she said lightly, ”I’ll make sure the first guests are celestial. Dressed in sequins. Dripping awkward judgment.”

He groaned. ”Why are you like this?”

”Because I can be.” She nuzzled his collarbone. ”You like it.”

He did.

Too much.

He wrapped an arm around her and sighed. ”I’ll shower. Change. Pretend to be respectable again.”

”Already laid out your new outfit,” she said, clearly pleased. ”Charcoal with a black shirt. Open collar.”

Lux smiled.

”You spoil me.”

Sira kissed his chest.

”You’re worth spoiling.”

For once, Lux didn’t argue.

Because deep down...

He kind of agreed.