"So what do you need?"
You had already anticipated this.
After all, the other party could hardly be a philanthropist, helping you simply because they "felt like old friends at first sight."
Besides, if that were the case, you would probably have found it even more unnerving.
Instead, you asked:
"I can pay a corresponding price!"
If it was a Supreme Treasure, a Divine Ability, or something of that sort, you could consider giving it up.
You could even give away this "Number One Other-Self."
—After all, you had already given Wu Yong three. One more would hardly hurt...
But to your surprise, the Higher-Dimensional Existence once again spoke in a higher-dimensional voice:
"I need a 'story' of yours that satisfies me."
Next, you learned that this [Dream World] had indeed been created by them.
Their original reasons for creating it were, first, an utter loathing for all the schemes and machinations of the outside world, and a desire to build a place free of such things.
The second reason, and the most important one, was—
Their ability was extraordinarily unusual. To strengthen it, they needed to devour other people's "stories."
Sorrowful, thrilling, immensely satisfying, or steeped in despair from beginning to end—these were the nourishment that made them stronger.
Likewise, they were enthralled by every story. Each was a priceless treasure, something they savored like sweet nectar.
You marveled at just how unusual the Higher-Dimensional Existence was!
Other Higher-Dimensional Existences excelled at scheming, yet the Higher-Dimensional Existence dismissed it with disdain, pursuing utterly enthralling "stories" instead.
Of course, that was also because those stories were their nourishment.
"So... you want my 'story'?"
After pondering for a moment, your higher-dimensional voice emerged through "Number One Other-Self."
"Of course. I never offer help of my own accord, unless you possess enough