The Main 6 stood in a room in Twilight's castle, wearing the new "outfits" Rarity had designed for them.

Each of them was wearing a pair of tight panties which covered most of the butt. Twilight Sparkle's were white, Rainbow Dash's were pink, Rarity's were purple, Pinkie Pie's were light blue, Fluttershy's were green, and Applejack's were red.

They had all eaten a certain type of meal cooked by Pinkie Pie, and drank lots of cider and water. They each stood next to the pony they were most attracted to: Twilight Sparkle and Pinkie Pie, Rainbow Dash and Applejack, and Rarity and Fluttershy.

Spike was in the room as well. The ponies didn't mind him witnessing their activities, he just thought it was funny. Although they did get some sexual pleasure out of what they were about to do, they also liked it in less sexual ways as well, and as they all shared the same kinks, they were at ease doing it in front of each other when they were all in the room. But they'd never do it in front of anyone but each other and Spike.

They started with the one activity they could do at this time: Rubbing each others' butts.

Twilight, Rainbow, and Rarity faced away from their respective partners, having decided it was their turn first.

Pinkie Pie started rubbing Twilight's butt with her hooves. She rubbed fast and energetic, and Twilight giggled at the feeling of it. She really liked the way Pinkie did this.

Pinkie also liked the feeling of Twilight's tushie, which was not particularly firm or soft, but somewhere in between. It didn't make a difference to her the feeling of the panties or not, but they sure made it funnier for her, causing Pinkie to giggle as well.

Applejack rubbed Rainbow Dash's butt slower but harder than Pinkie. She wasn't into fashion much but she did like the feminine touch that the pink panties added to the tomboyish pegasus, and made her butt all the more arousing to rub. Even though she loved Rainbow Dash as tomboyish as she was. Rainbow's butt was very firm, just how Applejack liked it.

Rainbow loved it when ponies rubbed her butt as hard as possible and Applejack was the perfect pony for this. She, too, felt a sort of naughty pleasure of being in pink underwear for it.

Fluttershy rubbed Rarity's butt very gently, but making sure she didn't miss an inch of it. Rarity's butt was very soft, and, in Fluttershy's opinion, the loveliest rear end in Equestria. She also liked the feel of the panties as well.

Rarity loved how delicately yet thoroughly Fluttershy was rubbing her behind. She couldn't have asked for a better pony than Fluttershy.

After five minutes, the ponies switched.

Twilight caressed Pinkie's butt. She and Twilight had very similar butts, and Pinkie's butt was just what Twilight loved to rub the most. Not too hard and not too soft, somewhere in between.

Pinkie giggled at Twilight rubbing her tushie while in a pair of panties, finding both butts and underwear to be funny, while at the same time enjoying the butt massage itself.

Rainbow Dash rubbed Applejack's butt just as hard as Applejack had done to her. Applejack liked it as hard as Rainbow Dash did.

Applejack's butt was a bit softer than Rainbow Dash's, also Rainbow's preference.

Rarity massaged Fluttershy's butt harder than Fluttershy had, but still making sure her hoof touched every inch of it. Fluttershy's butt was just as soft as Rarity's and she really loved it, not to mention the feel of the panties she had designed. Put together, the panties and Fluttershy's butt were perfect.

Fluttershy closed her eyes as she enjoyed every second of Rarity rubbing her tush. She loved the way Rarity did this, every part of it.

Five minutes later, they switched around, and kept doing so for half an hour until they felt it was time for the next thing.

Author's Note

I considered pairing Rainbow Dash with Fluttershy and Rarity with Applejack, but I decided on Appledash and Rarishy instead. They seem to go so well together for this kind of thing, plus RD and AJ get competitive in the next three chapters.