"Thank you dear," Rarity said to the banker in front of her. The brown unicorn in front of the fashionista wore a small black vest, and had a chequebook cutie mark.

"T'was my pleasure ma'am," the banker replied with a curt nod and a warm smile.

Rarity floated the piece of parchment she had been given. It was her latest account balance. Her eye's sparkled like the gems she so often used in her clothing as she took in the sight. Her fashion show in Canterlot had been a complete and utter success. Critics had hailed her for her bold use of enchanted thread that changed color depending on a mare's emotional state. Stallions had tripped over themselves to get a product that would offer some illumination to their herdmates inner feelings, while mares simply adored the novelty of a set of clothing that always matched how they felt. Rarity tucked the note into her small saddle bag and went down the road.

The scarf around her neck shone a brilliant sparkling fuschia from the sheer ecstatic joy that was overriding every other feeling. Rarity ignored everypony in town as she made her way to Twilight's. She needed to personally thank all her friends for all the moral support they provided while she worked on her magnum opus. She was, after all, the element of generosity, not modesty. While boasting was typically the purview of her good friend Rainbow Dash, the unicorn could not keep the feeling of pride over her accomplishment to just herself. She needed to go to one of her friends and shout.

"I've finally made it!" Rarity burst the summary of her emotions with all the flash and flare of a Sapphire Shores concert. As villagers looked at her with mild shock at the outburst, Rarity chuckled before swiftly trotting the rest of the way to the library.

When she arrived she opened the door, foregoing the usual habit of knocking on the door of her friend's sanctum. Looking about, Rarity saw Twilight reading in her usual small alcove. The purple mare's horn continued to glow as Rarity walked up to her.

"Twilight, I just wan--"

"Wah!" Twilight slammed her book shut and spun around to Rarity, breathing heavily. "Oh, sorry, I was really concentrating on what I was reading, or trying to at least." Twilight's sides continued to heave as Rarity gave her a confused look.

"Dear, are you sure you're alright? I'm sorry I didn't knock, but that reaction was a little bit much. Are your studies going over well?"

Twilight got off of her seat and took a deep sigh. "Yes Rarity, I'm fine. All my books are arranged, and I'm ahead of my studies." Twilight walked rather slowly to a shelf and pulled out another book, before placing her other book in an open slot on the shelf. She turned to Rarity and smiled. "How are your sales?"

Wordlessly, Rarity floated out the account balance to her friend. Twilight's eyes widened as she looked over the piece of paper. The purple mare's jaw hung loosely. She glanced up at Rarity inquisitively. In response, the white unicorn simply nodded.

"Wow Rarity! I'm really happy for you. I guess you'll be in the black ink for a long time." Twilight walked over to her couch, again rather slowly, and floated the book in front of her.

"Yes I am, with this and the savings account I set up for Sweetie Belle, she'll never have to worry about payments for when she goes to university! Then there's the fact that this will last me quite some time. Then there are future contracts, the money I received for interviews, and... Twilight, are you listening?"

Twilight lowered her book hastily and blushed. "Sorry Rarity, I just wanted to get some leisure reading done, but go on! I'm still paying attention."

Rarity bit her lip at her friend's more-than-usually awkward behavior, but decided to let it pass. "So I was thinking. Seeing as how I've made so many bits, I decided to get all you girls a special treat!" Rarity floated out a scarf made of her emotionally sensitive fabric, and, before Twilight could protest, swiftly wrapped the white garment around her friend.

Twilight's eyes widened as she watched the fabric turn from white to a deep forest green. Distraction. Rarity looked on in shock when the garment became infused with pulses of yellow. Twilight blushed deeply as she rubbed her hind legs together, causing the pulses to flare up briefly.

Rarity realized her mouth was hanging open before she snapped it shut. That had been the last pattern to show up on the fashion show. When the model was asked what she was feeling at the time, she had blushed as her stallion brushed up against her, making the colors flare up.

"I've been reading to keep my mind off of it. It's been working well enough," Twilight explained.

"Oh, there's nothing to be ashamed of Twilight," Rarity cooed.

"I know that, but I don't exactly want to advertise to the world that I'm in season." Twilight gestured to the closed windows, then retracted her hoof and bit her lip. "Would it be better to keep the windows open, and let the air diffuse, or keep them closed, and let it stay in here?"

Rarity daintily sniffed at the air. It was rather stuffy, even for the summer. As the white unicorn carefully assessed the air, she did catch a slight whiff of Twilight's odor. "Windows open, but wouldn't a studious mare such as yourself already know that?"

"I um... don't normally go into estrus. All day studying, staying up late at night... studying. I guess when I went with you and the other girls for that fashion show, I sort of... How would Rainbow say it? 'Got into the swing of things'?" Twilight threw the scarf off of her as the blue gradients retracted to small purple dots, denoting embarrassment.

"Well," Rarity said modestly. "I'll leave you to uh, 'sweat it out' if that's how you want to go about it. Would you care to come over for tea once you're done in a few days?" Rarity turned to leave before looking over her shoulder. Gears started to grind in her head as the innate gift-giving instinct began to realize something. "Twilight? When was the last time we, as a group, had a vacation?"

"Well, there was the wedding in Canterlot, but that didn't turn out to be relaxing." Twilight lifted a hoof to her chin and gave a pensive stare at the library ceiling. "The train ride to the National Dessert Competition Before that uhhh, Hearth's Warming Eve maybe?" She bit her lip and looked down at the ground. "But we were performing the pageant."

"We haven't really been away for Ponyville for strictly relaxation for quite some time..." Rarity trailed off as she drifted into thought. The gears in her head finally lurched fully as all the pieces fell into place. "IDEA!" she declared proudly. Her saddle bag flipped open and soon a brochure came out of her bag. She trotted over to Twilight and nearly poked the purple mare's eyes out with the paper corners as she shoved it into her face. "Fleur De Lis suggested I consider this if I ever wanted the illusion of roughing it. A tropical vacation!" Rarity announced.

"Tropical vacation? But Rarity, as cheap as real estate is that would still cost a..." Twilight lowered the hoof she had raised when she realized her argument was irrelevant in light of Rarity's fortune. "But the long days would make my estrus come back by the end of the month."

"And there would be no stallions for you to worry about. If you get angsty you'll have all of us to help out. You could bring your books, Rainbow Dash could explore the jungle and play out her Daring Do fantasies, Fluttershy could spend time with the animals, I could sunbathe, and Pinkie..." Rarity pursed her lips before finishing, "can do whatever she'd do."

Twilight floated the brochure in front of her. The trip would be surprisingly cheap, all things considered. The island they'd go to would be one of hundreds in a large archipelago. Equestria was nothing if not vast, so real estate was inexpensive everywhere. It was really just a matter of going about, planting a flag, and building something. "Rent an island for the summer," Twilight said, lowering the pamphlet briefly before bringing it back in front of her. "They each have cabins with plumbing and electricity." Her eyes began to roll over the pages as she became more and more open to the idea. "They bring in supplies each month. Rarity you're a genius!" Twilight set the brochure to the side as Rarity blushed.

"Well let's not exaggerate." Rarity modestly waved off the compliment before Twilight continued.

"Hang on. The prices would be cheaper if we had twelve mares go." Twilight hopped off her couch and walked to her desk. "I know Cheerilee would love to have a vacation after a year of teaching." Twilight pulled out a powder-blue calendar. "And Trixie did say she wanted to take a sabbatical after coming from her latest tour in Las Pegasus." Twilight turned to Rarity and tilted her head. "Can you think of anypony else who'd want to take a break from it all?"

Rarity smiled sweetly. "Oh, I have an idea or two."

Twilight walked over to Rarity. When her hoof brushed against the scarf on the floor, it turned a bright yellow from her anticipation. "Great, you can go get the others. It's best if you go tonight." Twilight lifted a hoof and prodded the white mare. "You've been walking around Canterlot and Ponyville in the sun quite a bit for the last few days. You'll probably be going into estrus soon."

With a nod in agreement, Rarity stepped out of the door to make her proposal to her friends and others around Ponyville who had earned a break.

Author's Note

Alright I decided to make a long-form clop that would revolve (mostly) around this premise. Twelve mares on a tropical island in the middle of the summer, (semi-realistic) estrus going on, a society that supports multi-partner and homo/bisexual relationships, and plenty of fun adventures to be had in a unique setting.

That said, I know you all have some preferences in who appears in your clop-fic stories. So go to the "A Summer to Remember" Thread on the clop-fic group to give your votes on what other mares you'd like to see frolicking in the nice warm waters of a tropical paradise, and maybe getting down for some sex ranging from the adorable to the kinky.

Additional details are on the thread. I will count votes sent to me as personal messages which shall remain anonymous.