Can I do myself?

"You said." Pinkie stared before flattening her mane and adopting a monotone voice at the same level as her sister Maud's. "There's nothing left to study back home on the rock farm, so I might move to Ponyville." Pinkie then proceeded to blow into her own hoof to re-inflate her mane and happy expression.

"I'm also considering Ghastly Gorge." Maud replied in her usual voice. Her response prompted a series of laughter from her sister, but while Pinkie laughed and giggled, Maud's thoughts began to stir more openly. 'Why did Pinkie assume my likeness? Was it for effect? Have I always looked like that? I look...good. I wonder what i would sound like if i were to-"

"But you can't go to Ghastly Gorge." Pinkie's voice and concerns finally woke Maud from her mental daze. "Ponyville's all!" To which she gave a massive smile. "And Ghastle Gorge is all!" Pinkie's face then warped into a depressing drool.

"It was a rock decision." Maud replied, and would say no more about it. Pinkie could only continue talking while all Maud could think about was her curiosity.

When Maud and Pinkie both arrived at Ponyville, Pinkie brought her straight to Sugarcube Corners. When all their baggage was handled, Pinkie reached into her mane and ran through a list of various things she was going to do with Maud. As Pinkie prattled on about how she would prove there were better rocks in Ponyville than Ghastly Gorge, Maud only stared on. Though it looked like Maud was paying attention to or even caring about what was coming out of Pinkie's mouth, Maud was more focused on on Pinkie's face. How Pinkie could so easily look like her made Maud only break out into a colorless blush. She wanted to see if Pinkie could she her more.

"Pinkie Pie." Maud said, her voice silencing the pink chatterbox. "I want to try something first before anything."

"Oh? You do? What is it?" Pinkie asked, her body bouncing in excitement and anticipation. "You want a tasty treat? Go on a walk? Oh, I know! You want to...go for a swim? Oh, wait! How about-"

"I want you to look like me again." Maud replied, interrupting Pinkie's babbling.

"Uh, excuse me?" Pinkie replied, tilting her head in confusion.

"Earlier on the train, you looked like me to repeat what I said." Maud replied, looking almost through her sister. "I want you to do that again. I'm curious about something."

"I don't quite understand. But okkie dokkie lokkie!" Pinkie replied with a wide grin, before shaking her head until her mane deflated and her eyes seemed to shape to form Maud's. Clearing her throat, Pinkie opened her mouth and began to speak like Maud. "What did you have in mind Maud?"

"I need you to lie on your back on the bed." Maud instructed, directing her hoof towards the bed. Nodding her monotone head, the Pinkie Maud leaped onto the bed and lay on her back. Looking at her pink form laying so exposed on her back made Maud's heart nearly skip a beat. "Good, now just lie back and react how I would."

"What are you-oh?!" Pinkie replied in the Maud voice, but then let out a Pinkie yelp as she felt something press against her crotch. Looking down, Pinkie could see Maud was carefully, yet assertively eating her out. "M-Maud?! What are you-"

"I said react how I would." Maud interrupted, before continuing to shove her rough and thick tongue into Pinkie's pussy.

"This feels...strange..." Pinkie replied, trying her best to maintain the Maud voice. But as Maud continued to pick up her speed and motion, her tongue now fucking her tight, warm pussy, Pinkie was finding it hard to hold on to the act. "...it's a good strange..."

"Better than a rock?" Maud asked, her monotone voice almost muffled by Pinkie's softness. "How do you like be tongue fucked by yourself?"

"I...I..." Pinkie was beyond confused, but didn't want Maud to stop. "...I..."

Pinkie looked down, all she saw was Maud bobbing her head up and down as her tongue pushed in and out of her pussy, teasing and stimulating her sensitive clit. Pinkie knew Maud was enjoying this, and she didn't want to ruin Maud's fantasy. Taking a deep breath, Pinkie continued.

"I like how this feels." Pinkie finally said, her voice still a little shaky, but she was still in the Maud act. "Your tongue is reaching deeper than a rock would."

"Then I have to go deeper." Maud replied, leaning her head back for a second before pressing her open mouth hard against Pinkie's warm entrance.

Pinkie's body arched back in the sudden rush of pleasure. Maud's tongue was striking her sweet spots with such precision. Pinkie couldn't help but twitch as she felt herself orgasming. Reaching down with her hooves, Pinkie held Maud's head in place as she squirted her sweet nectar all over Maud's tongue and into her thirsty mouth. Maud wasted no time and lapped up Pinkie's juices while looking at her sister still appearing as her.

"Thank you Pinkie Pie." Maud said, lifting her face, some of Pinkie's juices dripping from her lips. "I could not have done this without you."

"No problem Maud." Pinkie replied, looking deeply into her sister's eyes as she enjoyed the after glow. "Anything for my big sister."