Twilight paced back and forth in front of the distraught-looking Pinkie Pie and the more impassive pony that claimed to be Silver Stars, though his cutie mark was quite convincing. "Let me make sure I understand this. You--" she pointed at the new pony. "--are Silver Stars, who used one of Fast Change's spells to become an earth pony."
He nodded. "You can ask a few questions if you like, but that's the basic of it."
Twilight put a hoof over her face before directing it at Pinkie. "And you, somehow, got a hold of Silver and kept him.... as your pleasure slave for over a day."
Pinkie threw herself at Twilight's hooves. "I didn't mean it! Please don't hate me forever and ever!"
Twilight hiked a brow, then looked to Silver. "How?"
Silver took a slow breath. "There's something about Pinkie. If she gives a command, I have to obey it. Pinkie, tell me to do something really stupid."
Pinkie hopped up to her hooves and tapped a chin. "Oh, uh, stand on your forelegs while singing the anthem and drinking a glass of water!"
Silver threw himself up onto his forelegs and balanced poorly, wobbling as he began singing with equal grace, as he remembers very little of the Equestrian Anthem. When Pinkie offered the glass, he almost choked himself trying to sing while drinking.
"Enough!" Twilight banished the glass and set Silver upright. "Well, no harm done, I suppose, in the long term. Pinkie, were you entirely unaware of your ability? Tell the truth." She glared at Pinkie, watching her for any sign of falseness as Pinkie swore she had no idea. "Then fine, I forgive this. Like I said, no harm done."
"About that..." Pinkie squirmed. "I might just maybe be getting a foal on the way."
Twilight put a hoof over her face. "Anything else you want to tell me now?"
Pinkie shook her head, then held up a hoof. "Wait. When I look at Silver, I felt like how I felt when I was with your friends, the freaky ones. He feels like a human."
Silver tilted his head. "I am a human, sort of. I was certainly born one, and I imagine I think like one, mostly."
Pinkie clopped her hooves. "Oh, yeah. I forgot with you being a pony for such a long time."
Twilight clopped a hoof on the ground. "I want to try an experiment. Pinkie, go stand behind that room divider. Fast Change!"
The door leading out of the room pushed open to reveal Fast Change, who was likely listening the whole time. She strode in, eyes on Silver with a smirk. "So, do you believe them?"
Twilight pointed in front of the divider. "That's part of this test. Go behind the divider and look just like Pinkie Pie, down to the fur pattern. I want a perfect simulation."
Fast saluted and trotted behind the divider. There were some friendly words exchanged before two Pinkie Pies stepped out. Silver looked between the two of them and felt a dissonance. Intellectually they both seemed pretty and wonderful, but the unknown urges latched right onto one of them and he found himself staring.
Twilight looked between Silver and the Pinkie Pie he had focused on. "Is that you, Fast?"
"Nope," said the second Pinkie. "He's barely looking at me, and look at how he's staring. I've never seen a stallion fall that hard."
The first Pinkie squirmed. "Stop staring at me!" Silver turned away from her, looking at a wall. "Oh... I forgot how quickly he does what I say. Poor Silver, it's OK, I'm not mad at you!"
Silver did feel better, but he didn't turn back around. Twilight shook her head slowly, "Fascinating... but unacceptable. He's a stallion, and a prince, and my husband, and a friend. We can't keep him dancing to your every word."
Pinkie's ears fell and she began creeping towards the door. "I'll just... go, so I won't bother anypony."
Fast Change shoved a pink hoof in the way. "Hold it right there, you curvacious mare," declared the other Pinkie. "If you told the truth, there's no way we're kicking you out. You've been Twilight's friend before we even got here."
"But I--"
Twilight put up a hoof. "No buts. Pinkie, you are a friend. This hasn't changed. I insist you stay until we're sure one way or the other if you're actually carrying a foal. If you are, then it falls on Silver and I to see you're well taken care of. Do you understand?"
Pinkie nodded slowly. "But I'm the one that caused all this... Why are you being so nice to me?"
Twilight poked Pinkie right on her snout. "I sent the entire city into a wild rampage, and you forgave that.. Now, when you returned, you said you weren't infected, and there wasn't any physical alterations that I could determine, but I think we may have been far too hasty to declare you clean. First question, did Silver's attitude change after any fluid contact?"
Silver perked up. "She kissed me, then mounted me, and I fell for her completely."
Fast Change blushed brightly. "You just threw him down and had your way? You minx!"
Twilight shook her head. "Focus. So you came into contact with Silver and passed it on to him, and he became attached to you. I'm curious why he's specifically drawn to you, but it's not as important as burning out this sickness before it has a chance to spread any further. I'm thankful it doesn't seem to have physical affects on ponies that are already ponies. In humans it causes all variety of physical deformities, to say nothing of species changes." She clopped a hoof. "Silver has had enough of those. Speaking of which, do you still think it's worth being an earth pony?"
Silver sat up. "I will continue being an earth pony until Rough Tumble gets the date he deserves."
Twilight let out a little sigh. "Fine. Stubborn mule." She turned from him and began trotting towards Pinkie Pie. "Come with me. I have more specific tools to help us downstairs. We'll figure out how much energy you have and how we should burn it out without causing undue harm."
"Is this going to hurt?"
"Only a little." Twilight led Pinkie away out of the room.
Only with Pinkie gone did he feel the bravery to peek over his shoulder, just to see Pinkie staring right at him an inch away and he cringed away from looking at her. "Sorry!"
Fast Change allowed her native form to flow back. "You're really taken, aren't you?"
Silver sagged with relief and turned to face Fast. He jumped at her and hugged her. "It's so intense! I look at her and I see walking perfection. Everything about her feels flawless."
Fast nuzzled into his cheek. "What about her insides?" Silver burned and she giggled. "Go on, tell me..."
Silver grunted softly. "Her insides were the same. Every time we made love, it was a constant low-force orgasm with huge crests that threatened to wash me away. I wanted nothing more than to mount her, until the feeling passed. That's why I think she's with foal."
Fast whistled softly and glanced at the door. "Is it too late to get her to give me a wet one? I want to experience that..." Silver glared at her as he trembled a little. "Fine fine... Don't act like you didn't enjoy it at all. Your face goes all lovey dovey just describing it." She hopped up to her hooves and pranced towards the door. "So I think I won't be guilty of too much if I catch up with them before Twilight does her whammy with Pinkie."
Fast was out the door and along the stairs quickly. She didn't hear Silver following her and grinned. This should be fun... She saw Twilight and Pinkie walking so slowly. It seemed Pinkie was really nervous about the whole thing. Perfect! Fast spread out feathery wings and sailed down the stairs, coming to a smooth landing just in front of them. She smiled at the two of them, nuzzled Twilight, which always put her off guard just a little, then she went in for a smooch with Pinkie. She suckled on the earth pony's tongue as she stared into Pinkie's eyes, waiting to feel the euphoric rush that Silver had spoke of. There it was! A powerful ripple ran through her and suddenly she was snout-to-snout with a goddess come to life.
She tackled Pinkie to the ground, deepening the kiss as she let her hooves roam over Pinkie's still-stunned body. Every inch of her was perfect. Even the way she trembled and squeaked was adorable any delightful. She wanted to be on Pinkie, in Pinkie, under pinkie... She wanted Pinkie in every way possible!
"Fast Change!" hollered Twilight, her wings extended as she hopped back a step, looking down at Pinkie and Fast, collapsed to the ground and lost in a face-sucking competition. "Fast! You stop this right now!"
Fast could hear Twilight's harsh words. They were grinding unpleasantly on her need to make wild love to Pinkie. She knew the cure. Twilight needed to have the gift shared with her, then she wouldn't feel the urge to be so loud. Fast came loose of Pinkie's snout with a loud pop, and she threw herself at Twilight in a tackle.
"Not twice!" Twilight rebuffed Fast with a hasty shield that quickly inverted itself, trapping Fast in a bubble of force. "We are cleaning you right this instant! Really... I expected better from you."
Fast growled and clawed at the shield, realizing she'd never have a chance to mount the goddess Pinkie as she had planned to do. "Let me go!"
"I'll let you go after you're back in your right head." She set Fast down in the center of her laboratory and began channeling that wild energy, burning it in waves of heat that washed over the both of them. Fast had only just been infected, so it wasn't too hard to get all of it, and it left Fast sprawled on the ground, tired and drained. "There. Really, what were you thinking?" She rolled her eyes and trotted over to Pinkie, who had sat up with a mildly confused expression.
"Pinkie, it's your turn. See, that wasn't so bad, was it?" Twilight smiled at Pinkie Pie gently. They walked together to the center of the room and Twilight set a hoof on Pinkie Pie's shoulder. "I'll be right at your side the whole time. Try to relax and let it happen."
Pinkie's energy proved to be vaster than Fast's, nay, on par with the massive amount Twilight had absorbed, and she stopped as quickly as she began, fearing she'd start setting things on fire. "On the other hoof, maybe we should do this outside..."