She makes an accidental wish, then applies some discipline.

"I mean it's all so hot and all, but how do I know I wouldn't be crossing any lines?" Ruby asked, pacing. "I wish I could just know ahead of time who would ultimately be happy about becoming a member of a harem if I decided to make one!"

"Oh, nice, granted!" Yang snapped her fingers, her eyes glowing with magic.

"Wait, wha-?" Ruby started to ask before she felt Yang's spell sinking pleasantly into her. "Oh... That felt nice... What did you do?" she then asked.

"Oh, nothing much, Mistress," Yang giggled. "I just gave you the ability to tell who would love to be yours in some capacity or another, in a way you would desire as well. Just focus on knowing that, and you'll be able to tell, via seeing an aura around them, which I even color coded for you!" she said, before grinning mischievously. "I even kept it simple so even you could understand it!"

"Hey! What's that supposed to mean!?" Ruby protested. Though it made her happy to hear the quip, if there was still any doubt that Yang was still Yang, that doubt was dashed. The fact that Yang could still make jokes at her expense was another layer of reassurance.

Yang giggled at her protest. "Sorry, Mistress, too easy, I couldn't resist. You wanna spank me for it?"

"You know what, I'd love to," Ruby grinned, realizing it wasn't really a punishment, but the offer was just too hot to pass up. "Put your hands against the tree there and stick your ass out!"

"As you command, Mistress!" Yang chimed, turning around, stepping back a little away from the tree, and then she leaned forward, jutting out her well rounded rear, covered in her tight shorts. It wasn't the dancer outfit, but the garment has its own appeal.

Ruby grinned as she approached Yang, and gave the genie's ass a slap, making her yelp in delight. "So tell me what each color means," she ordered, spanking Yang a little harder, the sound echoing out. She would continue to spank Yang as she answered.

"Unh... Mistress, if you see a -Ah!- pink aura, that means the you're -Mmm!- looking at is a total sub, would love to be a sex **** involved in this, whether they know it or not," Yang panted, wiggling her backside enticingly, eager for more spanks. "Blue is -Oh!- a desire for full equality in the relation- Yes!- ship! Purple is anything in between!" she explained as Ruby kept on spanking her. "I could add-Mmm!- red for someone dominant, but only if you want to include that..."

Ruby nodded, ceasing her spanking of Yang. "And anyone not interested?" she asked, rubbing her sister's butt gently now.

"Unh... Rare as I guarantee they are, no aura at all," Yang nodded. Ruby smiled as she thought about other wishes.