True Incubus: The Demon with No Limits

”You did not learn how to move your arm by reading instructions, you wanted it to move, and it moved.

Do the same.

Demonic Energy should come naturally to you.”

Lucian looked at his hand, then he closed his eyes, sensed the demonic energy he previously sensed in his heart and traced it all the way to his Core.

Once he was in his Core, once he had access to all the Demonic Energy stored inside him, like Vivienne told him—

He ordered it to move, just like one would his hand.

For the first few times, nothing happened.

But Lucian did not give up, he continued to follow the demonic energy, he tried to interfere with that current, he tried to learn how it moved.

Vivienne, who watched him, nodded in silence, seeing him work with that strong determination satisfied her.

Normal Blood-Altered Humans had proper training for years before they were made to consume demon blood, they already had the basics down and even they took around a week to control the demonic energy.

But Lucian had had no training.

In fact, he was supposed to get that formal training before he would have been told about the existence of demonic energy.

That was the ’procedure’ to train him.

And Vivienne skipped it.

She jumped right onto controlling demonic energy because her instincts told her he would be able to take it.

But even then—

Even though her instincts told her he would manage it somehow, she still believed it would take him at least a few weeks before he managed to sense demonic energy.

But Lucian did it within 30 minutes.

And when he did, Vivienne started expecting more.

Maybe it won’t take weeks, maybe, even without formal training, it would only take a few days—

That was when Lucian spoke up.

”Is that it?”

Vivienne looked at him, then she looked at his hand—

And her eyes shined.

Lucian’s hand grew hot, the veins under his skin darkened slightly, and a faint violet shade moved beneath them.

Vivienne could see it.

That was the demonic energy.

A dense amount of demonic energy that a newly turned human should not have, not to mention he managed to control it this quickly.

Of course, Vivienne didn’t show any of this on her face. She didn’t want the boy to get too cocky too quickly and get himself killed.

So—

”That’s too much energy, I told you to only move a thread.”

Lucian nodded as he tried to pull it back, his fingers twitching as he started losing control over the energy.

”I said use less energy.”

Vivienne commented.

”I am trying!”

”No, you are panicking.

Calm yourself.”

Lucian clenched his teeth, then, he took a deep breath and calmed himself, slowly, the warmth in his hand reduced, he felt some of the demonic energy returning to his Core.

”Better.”

She then pointed towards a thick black training post near the wall and—

”Strike.

Use the energy in your hand, not your muscles.”

”How do I know the difference?”

”How do you know which finger of the hand you are using when your eyes are closed?”

”I just... do?”

”Exactly.”

Vivienne nodded.

Lucian just looked at her with a deadpan look on his face, then, he just stopped trying to understand everything through logic and started depending more on his body instead.

Since Vivienne told him to punch, that was what he was going to do.

So he punched, and the moment his fist touched the post, the energy in his hand exploded outward and—

BOOM

Lucian looked at the result in clear disbelief.

The post was still shaking, the floor under it had cracked. Lucian’s hand felt numb, but he didn’t care, he just couldn’t move his eyes away from the sight in front of him.

This was... his doing...?

And he wasn’t even using all of his demonic energy...

Just...

Just how strong had he become...?

”Too wasteful.”

Vivienne, however, shook her head, dissatisfied by the result.

Lucian blinked at those words.

”Wasteful...?

That was more power than I would have generated even if I used all my strength.”

”I am not saying it was weak, I am saying it was wasteful.”

Vivienne pointed at the post.

”You used enough energy to shatter the outer layer but most of it escaped into the floor and air. For damage of this level, only a tenth of the energy you used is required.”

Lucian looked at the post again and suddenly, he felt... less proud.

”Do it again.”

Vivienne commanded.

He agreed and with that—

His real training began.

For the next hour, Vivienne made him gather Demonic Energy into his hand, foot, eyes, skin. He failed again and again, most of the energy he used was wasted, Vivienne told him to control it, to contain the energy he was using.

It wasn’t easy.

A normal being would need weeks of training to see any difference—

But Lucian was different.

He was... improving.

At a rate even Vivienne couldn’t believe.

Is it the High Incubus Blood?

She wondered in her head.

The Blood-Altered Humans the Enclave had only used weak, lowest-level blood, that too, in very diluted portions. So it was possible they only improved at the rate which a very low-born demon would, while Lucian himself would be multiple times better.

Of course, this was still just a theory in Vivienne’s head, one she had no way to prove since there was no past record.

Not that she cared.

She simply saw a boy with strong potential and she made sure this potential didn’t get over his head.

”Don’t relax, there are still countless things you need to learn to be somewhat presentable.”

”Yes.”

Lucian nodded, the determination in his eyes did not fade away, not for an instant.

The training continued for hours, the more demonic energy he used, the more he understood it and...

The more he understood it, the more it... began to drain.

At first, his body was filled with an endless amount of it, an amount that should have lasted him about a day and a half but...

After continuous use, the amount became... shallower.

And as it did...

His body began to react to the change.

”Haahh... Haahh... Lady Vivienne...”

He called out, standing in front of her with trembling hands and... a tent formed in his pants.

”We need to stop...”