A very surprising person! With a pink aura to boot!

"...um, hi?" Weiss stated, shifting a little uncomfortably as she gazed at the three naked figures in the bathroom. She wasn't sure why she was here, but she didn't protest as she felt compelled to walk into the room, glancing at Ruby in particular, blushing as she saw her shamelessly masturbate both of her genital parts. She didn't question why Ruby had a penis, after all, Ruby had wished for no one to question it. To Weiss, it was natural for Ruby to be a futa.

"Weiss?" Ruby grinned, not slowing down at all. "I'm surprised you're here..."

"Not quite as surprised as I am," Weiss grumbled. "What's this about, Dunce?"

Yang giggled as she closed the door and locked it. "We brought you here~!"

"What do you mean?" Weiss asked, crossing her arms, confused and mildly irritated.

"Well..." Ruby moaned as she kept going. "See, the thing is, Yang is a Sex Genie, and we're quite interested in inviting you to the harem we're forming~!" She gazed at Weiss, and focused, grinning as she saw a bright pink aura.

"...um, what?" Weiss questioned bluntly, blushing heavily. "A Sex Genie? A harem? I knew you were a bit... off, but this is rather excessive, even for a dunce like you. And why would I want to be in a harem with someone who can't even manage their emotions well enough to avoid drawing a Grimm I was supposed to fight to them?"

"That wasn't her fault!" Yang huffed, pointing at the lamp. "My lamp draws Grimm to it!"

"...uh, what?" Weiss blinked.

"That explains the fiasco in Port's class," Jaune muttered.

"At any rate, let us prove it," Ruby grinned, and Weiss stiffened.

"Wait, wha-?"

"Yang, I wish to have one of Weiss's deepest desires granted in a manner that aligns with the rules and potential dynamics of the harem, and for me to know what it is as it's granted," Ruby moaned through her autoerotic pleasure. Yang grinned and snapped her fingers as Weiss gave a half hearted protest, both nervous if this was actually real... and oddly titilated at the prospect.