The First Test Subject

Sweetie Belle arrived home just before dusk, the light golden and soft through the boutique windows. The front door creaked open, and she called out, “Rarity? I’m home!”

She barely had time to close the door before Rarity swept into view, hips swaying, an expectant smile curving her lips.

“There you are, darling,” Rarity purred, her voice like silk.

They met in the middle of the room without hesitation, arms wrapping around each other. Their lips met in a deep, practiced kiss warm, wet, and full of tongue. Sweetie moaned softly into her sister’s mouth as her hands moved automatically: one grasping Rarity’s plush rear, the other sliding up to cup the underside of one generous breast.

When they broke apart, both were slightly flushed.

“Mmm,” Sweetie breathed. “I missed you.”

“And I you, my gem,” Rarity replied with a smirk.

Sweetie was already sinking to her knees, her hands moving to slide Rarity’s skirt up.

But Rarity gently stopped her, placing a finger under Sweetie’s chin.

“Not yet, darling. As much as I’m *dying* to continue… I need you focused for just a moment.”

Sweetie looked up, confused. “Oh… okay.”

Rarity helped her back up and led her to the fainting couch. They sat side by side, close enough to still touch, but serious now.

Rarity took a breath.

“Sweetie… can I trust you?”

There was a shimmer in the air the subtle golden sparkle of the Root’s magic affirming truth.

“Yes,” Sweetie replied automatically, the question sealing the bond.

“And you trust me, don’t you?”

Another shimmer. Another truth settled into place.

“Of course,” Sweetie said, smiling wide.

Rarity nodded, steeling herself. “Then I need to tell you something important.”

She paused for effect.

“I’ve been gifted something... something magical. I found one of the Tree of Harmony’s roots. Specifically, the Root of Honesty. And it gave me a power one I don’t fully understand yet, but I do know it allows me to reshape reality by asking yes-or-no questions.”

Sweetie gasped.

“Wait… seriously?! That’s amazing! Like, literally rewriting the world amazing?! What have you done so far? Did you wish for a perfect day every day? Do we own Canterlot now? Are you secretly a Princess? Did you make my tits grow because you wanted to make them suckable and soft and—”

“Sweetie!”

Sweetie paused mid-ramble, grinning sheepishly. “Sorry. Got excited.”

Rarity gave a gracious laugh, waving it off. “It’s alright. I understand completely. But to answer your question no, I haven’t changed anything. Not yet.”

The lie settled on her tongue like velvet. The magic didn’t react she hadn’t asked a question this time. Carefully dodged.

“I didn’t want to jump in without thinking. I needed to be sure I understood the consequences. And… well, I also needed a way to test things.”

Sweetie sat up straighter, eager now.

“Test how?”

“I want to see how specific wording changes outcomes,” Rarity said, crossing her legs elegantly. “What rules govern it. Which truths hold tightly, and which bend. And I need somepony I can trust completely… someone who’s willing to let me experiment. To play a little. To help me discover what this power can really do.”

Sweetie’s eyes sparkled.

“You mean me?”

“Of course I mean you,” Rarity purred. “My sweet, beautiful little gem. If you behave… I may even reward you.”

Sweetie’s hands fidgeted excitedly.

“Oh my gosh. Oh my gosh! Yes, yes, yes! I’m in! What do you want to try? Bigger boobs? Longer hair? Should I bark like a dog? Can you make me lactate when you kiss me? Oh! Can you make me cum just from snapping your fingers? Should we try outfits that only we can see?!”

Rarity let her ramble. The way her mind leapt between practical and perverse was adorable and very informative.

She gently placed a hand on Sweetie’s thigh.

“All in good time,” she said smoothly. “We’ll begin with something simple. You’ll follow my instructions. I’ll ask questions and observe the results. No resisting. No questioning. Agreed?”

Sweetie sat up, chest puffing slightly.

“Yes, Mistress Rarity.”

Rarity’s breath caught slightly. The words struck something deep in her.

“Yes… I think I could get used to that.”

She rose from the couch and motioned for Sweetie to follow. “Come along, darling. Let’s begin your training.”