The Daily Life of the Inventor in Another World

"What do you think?" Marcus asked as he noticed Serafall's arrival.

The black-haired Satan looked around. "Hmm, you should get some paintings. I assume most of that space will be used for cars?" She pointed to the large empty area in the middle of the workshop.

"Probably... most likely. The walls won't stay like this for long, though. I plan to put my 'scale mails' there," he said, smirking as he watched her reaction.

"Oh? I see... so this was what you meant by 'foundations.' You needed better tools and equipment, didn't you?" she said, a look of realization on her face. She began to examine the space with even more curiosity.

"Exactly. Although, the first few models won't be as impressive as Boosted Gear or Divine Dividing," he said with a slightly pained expression. He didn't like that those relics from the previous generation were still superior to anything he could make right now.

"Says the guy who created a Diamond Core that can last forever as 'just something interesting,'" Serafall said, shaking her head with a deadpan expression.

"Well... I thought you devils had this kind of stuff in your mansion," he said, shrugging as if it were no big deal.

"Right... I checked the barrier core at the Sitri household. It's barely the size of my palm, and it's based on some sort of pearl. It's fragile compared to your glowing-particles-dispensing diamond core!" she said, rolling her eyes.

"Well, I suppose that's a good thing," he said, his eyes briefly wandering over her body.

Seeing his reaction, Serafall smiled slightly. But internally, it was more like a Cheshire cat grinning from ear to ear. She had been waiting for this moment!

As time went on, she began dressing a bit more revealingly. Not too much, though, as she didn't want her "plot" to be discovered too soon.

But this was good. Finally, her Master had started paying attention to her!

"It is," she said, subtly adjusting her posture. Nothing too obvious, but enough to catch his eye.

Her Master continued explaining how he would progress with his scale mails and eventually reach the level of Boosted Gear and Divine Dividing. But by this point, Serafall wasn't paying much attention.

No, she was focused on where his eyes were wandering. Were they on her breasts, her hips, or her ass? This way, she would know what he truly liked and could adjust accordingly.

After all, she was a devil—a being of sin. The black-haired devil lady would make sure to cater to her Master's preferences.

Eventually, the explanations came to an end, and Serafall seized the moment to push her Master onto the couch.

She ended up sitting on his lap, facing away from him.

Internally, she was smiling. Ars Goetia hadn't reacted at all, meaning her Master had allowed her to push him onto the couch like this.

She then pressed her shapely breasts against his chest.

"It seems you can finally enjoy the real perks of your Ars Goetia, Master~~~" Serafall purred in a husky voice. Oh, she had been waiting for this moment for over a year.

If only the Underworld knew that their Satan Leviathan was head over heels for a mere 14-year-old boy... Well, Marcus didn't look like a boy at all. He had been training in magic since he was only 11, and by the time he turned 14, his body was already in peak physical condition.

And Serafall could certainly attest to that. She loved watching him work without his shirt on. Summer was the best time of year—well, at least until her Master decided to install air conditioners.

The current Leviathan never told him, but she secretly turned them off sometimes…

After all, she couldn't lie, but she could keep her mouth shut unless commanded otherwise.

"Having a harem of 72 women?" he asked with a baffled expression, clearly not having considered such a ridiculous idea before.

"That too! But the real perk is that you can have me~~~ anytime you want~~~" she said, taking his right hand and placing it on her chest, while her other hand guided his to her shapely rear.

"I was thinking about rewarding you," Serafall continued with a teasing tone, though her eyes told a completely different story. She was clearly far more interested in other things. "You have no idea how jealous Satan Lucifer was of my paperwork speed. He even sent spies to figure out how I was doing it."

Her voice was light and playful, but her eyes burned with desire. She was horny—really horny.

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