There was a disappointing amount of nothing in terms of reaction between Yumi's ghostly magic and the giant pearl. However, Yumi described some sort of force pushing her away from it the more she attempted to go near it. It wasn't strong, but it was enough to stop her from trying to possess the item.

Immediately your mind, still flush with Lunacy Savantae, theorized about potential workarounds.

But those thought are interrupted as you heard Herta's footsteps approaching the Arcane Laboratory.

The goddess herself bursted through the door after a heartbeat of silence. A bout of deja-vu entered your mind, though that was probably on account of how this was second time she'd burst in a room while you were speaking to Yumi.

"Master! Master! Guess what!" Herta said.

And then she paused, glancing at you, then Yumi, and finally at the Giant Pearl between the two of you.

"What the heck," Herta exclaimed after a breath "Are you two doing???"

"Figuring out what to do with the Giant Pearl." You summarize.

"I can see that." Herta huffed. "But... why?"

"What do you mean, why?" You asked. "We've talked about this before."

"She's jealous that you're spending time with the wondrous and beautiful spirit known as Yumi." Yumi puffed out her chest in pride. "Envy suits such a violent goddess."

"Master," Herta looked at you, "You know I'm not the type to get jealous. Heck, I want you to have a huge harem! Even if it means you decide to waste your seed in a dumb ghost every once in a while. It's-"

"W-what the heck are you talking about!?!?" Yumi was both flustered and outraged. "I'd never waste Master's- I MEAN, HOW DARE YOU CALL ME DUMB!"

"-just that you didn't tell me." Herta finished, ignoring Yumi's outburst.

"I did tell you." You deadpan. "I told you multiple times this week, dumbass. But you were so lost in your research that you didn't hear me."

"Oh." Herta blinked. "Oops."

You sighed.

"Still," Herta still continued, "A useless slave like myself should try her best to make Master's life easy! As the Goddess of Artifice-"

"This would be simple for you to figure out." You finish for her.

"Yeah!" Herta smiled happily.

"H-hey, don't ignore me!" Yumi demanded.

"You wanna talk about how you just called me your Master?" You said.

That shut Yumi up.