Twilight got out of Trixie’s wagon only when the sun was about to set. The citizens of Ponyville, however, still kept roaming around. To her luck, none of the passing-by ponies knew the reason behind her huge smile: she just spent the time of her life with a certain great and powerful mare.

First Starlight, then Sunset...Then....This...What is happening to me? What is next?

A buzzing sound slapped her ears and returned her to reality.

A medium-sized briefcase made of black leather was an irreplaceable item for a nerd like Twilight for obvious reasons.She wore it every day like her friend Rarity wore her fancy top-notch lady bags Twilight considered too inconvenient. She could store letters, textbooks, sheets, pens, pencils and a huge number of other things within the leather bounds of ‘her little friend’, as she liked to call it.

It took Twilight little time to figure that the source of the vibrating noise was inside her briefcase. And as if she needed further confirmation, something buzzed inside it again.

Twilight undid the button of the briefcase and spread it open, trying to notice her phone. After an unpleasant process of rummaging through her documents and books, she finally grasped the phone and pulled it out.

She found a comfy spot in the shade of a large tree in the vicinity and sat under it. Having nervously looked around, she activated it with a tap on the middle button and read a notification on the lock screen:

'You have 2 unread messages from Glim-Glam.’

Twilight chuckled. Her phone was the only place where she could be as silly as she desired without having anypony consider her unprofessional, and almost every person she had in her contacts’ list carried a cute nickname. Even Princess Celestia was renamed into “Sun Horse”.

Starlight texted Twilight every now and then. It was either her seeking advice on a friendship issue or asking how to turn Spike back into a teen dragon form.

Twilight unlocked her phone with a flick of a finger and opened her Messenger.

It’s just Starlight asking her a trivial thing.

As usual.

Right?

‘You little minx’

‘Think you can steal my panties and keep me unaware of that, Silly Sparkle?’

Twilight’s blood instantly shot up her body and made her face red. Her pace of breathing quickened as her eyes went wide and pupils narrowed. She tried to hug her knees and almost dropped her phone on the ground, her shaky hands were disobeying her will.

As soon as the poor purple princess recovered from her shock, she started typing an explanatory letter at a speed of a lighting but froze when she saw a notification she didn’t expect.

‘Glim Glam is typing…’

Oh, Celestia.

Twilight was reminded of her little mistake in the worst way possible.

What was Starlight about to type? It was certainly a rant letter where she called Twilight a sloppy pervert and telling her their friendship had to be put to a terminal end. Yes, Starlight might’ve flirted with her, even sucked her horn, but how would she react to such a crime against a pony’s privacy.

But what came next made Twilight have a micro heart attack.

‘It’s a game two can play, Twinario~’

A close-up image of Starlight’s snout pressed against Twilight’s panties was attached to the text. Her lips were twisted into a satisfied, even insolent smile and her nostrils were expanded, a detail that made it clear that Twilight’s trainee was boldly sniffing her mentor’s panties.

Twilight erased everything she wrote and then felt her legs falling limp on their own, exposing her (or, technically, Starlight’s) panties. Not putting that into account, she typed a reply:

‘Starlight, no! It was just a mistake!’

There. She said it.

Starlight, however, shot back a reply:

'Your panties are so tiny. I’m sorry, but I have to put them on even if my thick ass stretches them. They smell of you and you know I can’t think straight when my nose catches your feminine smell. I had to try them on.’

Of course, another dirty photograph followed. This time, it revealed Starlight’s fit belly, tempting little navel, and thick thighs, her crotch hid under her own panties and her index finger pointing at the six-pointed star sign on her panties. She lay on Twilight’s bed, she figured.

What Twilight didn’t notice right away, was a damp dark stain on her panties.The fabric was so wet that Starlight’s velvety was fully exposed. When Twilight finally noticed the stain, she gasped and involuntary avenged her by creating a similar wet stain of an equal size in Starlight’s panties.

Her body was enjoying the naughty pictures more than she was ready to admit.

‘Starly, what are you doing? This is very embarrassing.’

She was now typing with one hand. The other slipped underneath her shirt.

“Twilight, I’m sooooo weeeet! Come home and stop me or I’ll fuck the life out of myself and die.”

The third image had a funny angle. It seemed like it was taken directly from Starlight’s point of view in lying state. Her huge bra-trapped melons were the only visible part of her torso. But it was by far not the hottest thing in the picture.

The hottest thing in the picture was her hand.

That little light pink hand, slender fingers, and well-groomed nails were unfairly cute, Twilight thought until she noticed what her hand was covered in. A thick line of vaginal fluids connecting all five fingers together and dripping down the hand made the image so hot that Twilight’s genitals went into overdrive.

Yet she had to type a reply:

‘Starlight, take my panties off! We can’t do that!These images are too sexy!’

Twilight wanted the phrase to make her sound at least somewhat decent. But to herself she couldn’t lie: she was hornier than a bitch in heat.
She nervously pulled her hand back from under her shirt and quickly shoved it beneath her panties, starting to fondle her tender flower and letting sharp gasps every time her fingers made a bolder move. Twilight just imagined the view of Starlight’s pussy juice right in front of her, the smell, the taste and totally got lost in the universe of lewdness. An alicorn that used to be shy like a bunny was now masturbating and moaning in public without a drop of regret.
Her hand went up and down, made circular moves and flicked her clitty, each movement sending more and more pleasure up her spine.

Suddenly she heard that buzzing sound again and instantly checked her phone.

‘Of course, you should’ve told me that earlier, silly! I didn’t expect you’d be that bold, however! See something you like, Princess Sexylight~?’

An image of Starlight’s spread wet girl hole made Twilight hysterically rub her pussy and moan loud enough to scare off nearby birds.

Eventually, a point of no return was reached. Her feet curled down, legs bent and back stretched backward as she sang her hypnotizing song of pleasure and rocked one of the greatest orgasms she experienced on her own.

After that, she lay down on the grass, hands spread apart and head looking upwards. She suddenly noticed the cold wind that grazed her skin like a young lover.

"Oh Starlight, we should exchange underwear more often..." She whispered as if Starlight could hear her and closed her eyes.

Author's Note

Probably the worst chapter ;-;

Please don't kill me.