A Tineey Little Sleepover

"Are you sure you understand the plan?"

"Of course I do! It's not that hard to understand."

"Good. That just leaves her. Do you understand the plan?"

"Yes, Miss. I'll do my best to sneak the powder to your parents without being detected."

"If by 'do your best' you mean 'do it properly without getting caught, just the way I said', then that's what I wanted to hear."

"Yes, Miss."

Diamond Tiara and Silver Spoon had gathered in Diamond Tiara's playroom a few hours before the sleepover to make last-minute organizations and finish their planning. What little planning there was, anyway, mostly consisted of two parts: blackmailing Diamond Tiara's maid (a simple, brown-coated earth-pony wearing typical maid attire) to dose Diamond's parents with sleeping powder, and teasing-slash-harassing Tiney aka Twinkle all night until his willpower could no longer hold out and his true form burst into view. Dosing Diamond's parents was a safety precaution to keep them out of the equation—the whole matter of the night-gowns was, of course, a hoax. That just made the teasing part more fun.

Now that every last thing had been dealt with, Diamond Tiara could let out a sigh of relief and rest easy until her guests arrived.

Which, by the sound of the loud, echoey doorbell, they just had.

"Get the door after you're done bringing my parents their... tea. And bring my guests upstairs. Try not to stare too much."

The maid blushed and looked down shamefully, doing her best to keep her eyes averted from her mistresses.

"Yes, Miss."

Diamond Tiara crossed her forelegs and huffed.

"Well? What are you waiting for? Get going!"

The maid nodded, still blushing all over, and made her way out of the playroom, shutting the door quietly behind her.

With their privacy assured, Diamond Tiara and Silver Spoon shared a delightfully devilish laugh.

"This is going to be so fun," Diamond said, snickering.

"You said it," Silver Spoon added. "Are you sure this changeling kid is really that hot?"

"Once we get him to lose his disguise, sure." Diamond fell backwards and landed on one of the many bean-bag chairs tossed around the room, this one a dark, royal purple. She kicked her legs in the air and let out a long, contented-sounding sigh. "He's got a wang almost as big as I am, and big, fat nuts you could suck on for hours. Real juicy, like." Diamond Tiara giggled and licked her lips playfully.

Silver Spoon's eyes glazed over slightly as she stared into space, her mind's eye evidently full of imaginings about the true size and shape of the albino changeling new to their class. A shiver ran down her back, and she let out a little moan as the feeling of tingles shot straight to her little filly slit.

"Ooh," she said. "That sounds amazing."

"Yep." Diamond Tiara sat up a bit and put a hoof to her chin. "There's also his friend. She's kinda whatever, but her tits are super big, huh?"

Silver Spoon nodded. "Uh-huh. They're the biggest I've ever seen. Even bigger than my mom's."

"And my moms," Diamond Tiara said with a nod.

The two of them could have gone on gossipping forever—but from the sound of things, Diamond's maid had finished with the 'tea', and was finally opening the door to let their guests in. In a minute or two, Diamond and Silver would have free reign of the luxurious family mansion, an entire night with no parental supervision to do whatever they wanted to tease out the big, fat cock hiding underneath Tineey's true shape.

As was practice, they shared one last knowing look and nod.

"Ready?" Diamond asked.

"Ready," Silver said.

The door to the playroom creaked ever-so-slightly as it parted, and Diamond's maid let Cupcake Sweets and Tineey inside. As she had been instructed, the maid shut the door behind them and locked it, summoning an intense willpower in herself to keep from staying behind and ogling her mistress's company. Only Diamond and Silver knew her secret, the reason she'd gotten the job in the first place, and they loved to tease her with flashes of their underage bodies and tantalizing suggestions about things they might do with her if she was good.

But now it was just the diabolical duo and their two targets. The night was about to unfold.