...Hmm, the premise is that he promotes to LV11.

Taking that crucial step, from here on out the world is his to explore.

Below legendary I am invincible, above legendary a one-to-one exchange.

For him, the most precious resource is time.

And now, the Black Swan has helped him save this crucial time through mutual exchange.

As for the cost...

Louis fetched a basin of water from the bathroom and placed a towel on her forehead. His face softened a little:

"Sleep well. If you need anything, just tell me, I'll help you."

The Black Swan replied with some sarcasm:

"It's really not easy to enjoy this kind of treatment from you."

"If you can't say anything nice, then say nothing at all. Just sleep well." Louis felt a bit overwhelmed, "The aftereffects of mutual exchange are quite significant."

The Black Swan said nothing dejectedly.

Louis picked up the towel and touched it.

Damn it.

In just a brief moment, the towel became hot.

"Don't you need to go outside for medical attention?" Louis said seriously, "You better not die."

"Medical treatment is useless." The Black Swan said weakly, "The discomfort in my body is due to the forced swallowing of my power source, no one can treat this pain."

"Can the only thing I do for you be cooling you down?" Louis said sullenly, "I feel a bit guilty seeing you like this."

"It's okay... just stay by my side for a few days. As long as I can sense my origin essence, it can slightly numb my body, that's enough."

It doesn't make a difference whether this essence is on Louis or on her.

Yes.

The Black Swan lied.

She previously told Louis that through mutual exchange, he temporarily obtained the Black Swan's career level, but that he couldn't fully swallow the Black Swan's origin essence.

Her explanation was "Louis' level is too low."

But in reality, once mutual exchange is initiated, even if the swallowed party tries to reclaim their power, part of it gets swallowed.

The way to undo this weakness is very simple—

Just swallow Louis back.

"Sorry, you lost too much this time."

The Black Swan didn't reply.

When Louis looked at her again, he found she had fallen asleep.

Seeing her frail appearance, Louis shook his head and got up to fetch more water.

But the Black Swan's hand clutched at Louis, not allowing him to leave.

Louis initially wanted to break free, but gave up on that option.

He actually knew.

The mutual exchange allowed both Louis to swallow the Black Swan and vice versa.

And due to the significant difference in career level, the Black Swan could completely devour him.

If it wasn't to save the Little Swan, he would never have agreed to the mutual exchange under any circumstances.

Even now, his career level increase isn't because his sin power is potent.

It's merely because the Black Swan allowed her origin essence to be consumed by him.

He can feel that once mutual exchange begins, someone must lose as the final outcome.

If the Black Swan surrendered voluntarily, the difference in career level would avoid Louis from being completely overwhelmed by her origin.

But if he lost, he would be utterly devoured.

The gap between the legendary and hero level is enough for her to devour him completely.

But she didn't choose that, so Louis owed her a favor.

He gently brushed away the bangs resembling the Little Swan's, revealing her pained expression.

"Sleep, I trust you this time."

Hearing Louis' words, the Black Swan's furrowed brows relaxed a bit, like a wounded little beast, curling up beside Louis.

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