Dash sat there, her plot at least hidden but her mane and fur color made her stand out. "Another drink, please." The words from Cadance had her full attention and working carefully, she poured another glass of berry juice for the princess. The glass levitated up and the alicorn sipped it, sparing a smile down at her maid. Dash almost squirmed in place.

There was only one pony Gel knew would be able to fully test the water and, unfortunately, she was back in Ponyville, snuggled up with a pink earth pony and one of his gooplicates. The thought made him pause a moment, which one was the original? Did it even matter?

"If this is an outside force, we can't afford to turn a blind eye." Celestia had called her sister in, who had blushed at the sight of Twisty. It wasn't until the changeling trotted over and nuzzled the aloof alicorn of the night that Gel suddenly realized that the mare had apparently scored even better than he had. Luna continued. "We… we must locate the ponies doing this and stop them."

Twisty snuggled the distracted Luna, leaning up and nipping at one ear. The alicorn didn't pull away, rather she gave a sigh and leaned in to the shapeshifted changeling.

"Right, so where is the source? If they are keeping this going for more than a day they must be adding it constantly." Gel looked at the map.

Golden magic pointed a quill at the very mountain itself. "There is a spring that spills the city's water out. Whatever it is must be there." Celestia heard a grunt and moan, sparing a glance for her now mounted sister. "And if nothing else we need to stop it, I don't know how much longer we can even keep thinking about our duties. It is like a fog comes over… almost like estrus."

Gel pondered that and gave a nod. "Mind if I call in one pony?"

"Who?" Celestia didn't look impressed with his request.

"Who else, Muffins. I take it you trust her?" Gel smiled as he spoke, he knew full well Celestia had trusted Twilight Sparkle's safety to the pegasus. "She… you know that amulet? Well we kinda messed with it… you will see."

Gel reached, finding Muffins asleep, his last effort to give her a good night still working away in the apparently exhausted mare. Gel slowed his ministrations down and reached out one of her hooves. Lifting it up, he gently rubbed her cheek, whispering louder and louder into her ear. "Muffins? You in there? Equestria needs your help…"

The last words did the trick and the accidental alicorn shook her head. "Gel?" She looked around a little confused.

"Here." The changeling gave her a gentle squeeze all over. "Need your help in Canterlot, official business."

"Of course I am fine with her. That mare knows how to keep a secret and her heart burns with Equestrian pride." Celestia's words made it a little harder for Gel to focus, splitting himself between two such distant locations.

"Come on sleepy-mare, need you up and on a train to Canterlot." Gel rubbed Muffins all over, working her legs and getting her standing.

"What's happening?" Muffins yawned and looked out the window, seeing it as still very dark. "Wait, what time is it?"

"All we need to do is send her a message and we can get her here too. Let me get my quill…" Celestia started looking around, clearly distracted again.

"Wait, don't, I got her. She is going to commandeer a train and get her flank here as soon as possible." Gel relayed the conversation he was having with Muffins.

"We need to have a talk… a serious talk, when this is over… Twisty…" Princess Celestia looked over to the changeling clearly at a loss to continue her conversation with Gel. Thankfully the mare in question had just finished with her sister. "Please, I need-"

"Coming!" Twisty sounded entirely too happy.

Gel settled in at the door, he didn't watch the princesses as they screwed Twisty through most of the night, but he was perfectly fine guarding the door. A knock came before dawn, Gel instantly lifting his head. Then he smiled and reached to open it. "Muffins, welcome." He didn't have to reach out and pull her in close to hug her but he did anyway. "We have a serious threat. First thing, don't eat anything or drink anything here."

The gray alicorn looked confused, then spotted two collapsed princesses with a very content looking changeling stallion sleeping draped over them both. "Oh wow that is hot, Gel do you have a camera?"

"No, but you… Muffins, did you have anything on your way here?" Gel squinted at the mare as she reached a hoof back between her back legs and started trying to rub herself. Gel countered by thickening himself up over her mound, denying the alicorn any self-stimulation. "Hay, not fair!"

"Muffins, somepony is drugging the water in Canterlot, it is making everypony's libido go nuts." Gel had to reach out and poke the mare. "Muffins, listen to me."

She was still rubbing that thickened mass and whimpering. "You are so mean, Gel. So how do we stop it?"

"The springs that feed the watefalls, it is where Canterlot gets its water from, too." Gel guided the horny mare over to the map. "We need to sneak up there and find out what is happening."

"And then will you let me get off?" Muffins looked up at the stallion, a defeated look on her face. It almost broke Gel's heart.

"Muffins, if we get this all sorted I will personally screw you until you can't think anymore." Gel leaned in and nibbled her ear. "I promise."

The mare perked up and did a happy dance of victory. "Alright, let's go get these goons and beat 'em up and we can come back here and you can screw me so much I forget my own name!"

Twisty stirred and looked over, her perch much to her liking. "What's going on, who is the… alicorn?" She woke fully seeing Muffins, a hoof coming up and rubbing her blue eyes. "Who is that?"

"I'm Muffins!" The titular mare beamed, her eyes tilting to the sides. "Did they have what I had?" She pointed to the two worn out princesses with one hoof.

"No Muffins, they had a Twisty. You get a Gel… but yes, the water of the city is contaminated, lets go stop it." Gel leaned over and pressed against Muffins.

The gray alicorn's eyes flew open. "Wait, I am mfffmf!"

"Mine." Gel whispered into the mare's ears as he flowed over, rejoining with part of himself. He adjusted Muffins' stature, giving her extra height and wing-size. He put a fair bit of mass all around her. "Not getting hurt tonight." He reached down her throat, puffing air gently into her lungs and finally adjusted his outer look to resemble a changeling. "Your steps will guide us, lets go."

Muffins was dizzy. She had spent so long with just a little Gel around her that she wasn't ready at first for so much. Her body felt bigger, heavier. He had shoved a lot of himself into her as well and her belly showed as if she were a little pregnant. Opening their mouth, she took a deep breath. "Okay." Her horn lit and opened the door.

"Well that is the strangest thing I have seen today…" Twisty was blinking at the closed door before she felt something grab her very sensitive stallion bits.

"Mmm, more." Celestia's words brokered no argument, not that Twisty would give any. She beamed in delight and moved to line herself up. Her hips gave a buck as she pushed forward, the clutching depths of the white alicorn's passage feeling divine.

Celestia knew the changeling was taking advantage of her, she counted on it. The mare scratched every itch this abominable curse inflicted on her so well that she had suspected her at first. Twisty had been so very honest that it was impossible to not trust her and, in trusting her, accept that here was one pony in Canterlot she could really trust, apart from her sister. "More, more more more." Thought faded as her hormones took over, Celestia's mighty wit and mind becoming subservient to her body's needs.

Twisty rode the mare, driving in and out, playing stallion for her was just about the best thing ever and, along with the fun of simply screwing the two great sisters was their taste. Twisty Turn reached into Celestia, felt the mare give way to her probe not with force, but with desire. The changeling drank and drank. She drank so much she barely noticed when her urges overwhelmed her and she came.

"So there should be one pony in there, keeping watch on the inlet pipe." Muffins whispered softly, knowing Gel would hear her no matter how quiet she was. The pair were slinking through the caves above Canterlot, the sounds of rushing water obscuring any noise they might have made. Unfortunately it meant they couldn't hear others either.

They crept along, eyes focused ahead. "Wait, those are zebra…" Gel was a bit confused, until he saw one hook a pipe up to a device in the flow, turning a large stop-valve on. "Crap they are doing this. This is big Muffins…" Gel waited for the mare to speak.

"Brothers, we have an intruder!"The voice that called out was yelling from right behind Gel and Muffins. Starting to turn, Muffins heaved out one big leg and counter-balanced with her body. The spin accelerated her hoof to lightning speed and brought it up to the monochromatic enemy. The sound of glass breaking was barely heard.

Gel flowed off Muffins, at least most of him did, shortly after her hoof connected and knocked the one zebra out cold. "Lets do… do…" Gel blinked, an odd sensation passing over him. The changeling shivered and trembled a moment and then lay down.

"Gel, GEL! What are you doing, I can't move!" Muffins was screaming, trying to fight the prison that held her.

"Ah, our brother did well to recognize this threat. It took a lot to research something that could disable such a strange beast." One of the zebra who had been drugging the water had come up and uncorked a bottle. Setting it down in front of the goo-changeling he turned to Muffins. "And what have we here? Wearing the living thing as armor? That wasn't the best of ideas."

Muffins tried to move, or fight, but Gel seemed not only unresponsive but stopped her from moving. Even her mouth was heavy and impossible to move now, all she could do was breathe and watch as the zebra loaded them both up onto a cart, keeping the open bottle close to Gel at all times.

A thick fabric bag was pulled over Muffins' head, obscuring everything and, worse, it was soaked with something that, in moments, had her closing her eyes and sleeping.

Gel woke up from the odd stupor. He was on his own… well, he could feel Muffins nearby and was around her too. Trying to reach out further just had him hitting a wall of… something.

"Subject seven is awake!" A voice got his attention and Gel was looking through oddly thick glass at a zebra. "Oh don't look like that, we are here to test you!" The zebra was pulling at levers and twisting dials.

Gel didn't like this one bit, the room he was in reminded him of one of the glass bottles he had seen in Twilight's lab. Worse, it was big enough to hold him.

A pink mist started to pour in from the top of the bottle Gel was in and he suddenly started to ache. "Muffins, I am sorry…" He managed to whisper to the sleeping mare before he began to screw her, hard, fast, not taking any time or care for her. He hated it. It was like they had control of him.

"Subject seven seems to be affecting subject seven A, even though completely separated." The zebra's voice filled Gel with anger, this wasn't right. They were making him… making him rape his friend.

"Gel… you… you awake… oh more…" Muffins melted happily, the drugs in the water she drank on the way to see Gel in the castle were now complimented by him screwing her and she made sure to voice her approval. But something was really wrong. "Gel?"

The mare's whole body was rocking as Gel drove in again and again. When she asked him to keep going, however, he sighed a little. "Muffins?" She didn't show any sign of reacting and he suddenly realized he couldn't control himself with her.

The changeling threw himself at the glass prison, again and again, trying to break through it, to no avail.

"Good, now lets try the control device. The creature is part changeling, it worked on them it should work on it." A second Zebra had stepped up into Gel's field of view and they held what looked like a collar.

They opened the cage that held Muffins and approached in a heavy protective garment. Gel tried to fight his urges, to stop from screwing the alicorn and instead try and get to the zebra. The need in him was too strong. The feel of the collar coming around his neck, his other neck, frightened him. The click as it secured was worse as Gel suddenly stopped, stopped screwing muffins, stopped fighting in the other cage and worse, stopped thinking for himself.

"Choke her, slowly."

The zebra's voice seemed so very reasonable and Gel nodded, cutting off Muffins' air. It was easy to do and he was glad, easy things were better.

"Good, good, okay stop choking." It didn't seem any more or less a good idea than the first and Gel let the alicorn breathe again. "Well this is most excellent, lets get to programming it up and releasing it."

Author's Note

Oh no, Gel, what has happened! Those zebra are not nice, not nice at all!

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