Something in common after all.

"Did she ask to see you too, darling?" Rarity asked, coming up beside Rainbow Dash as they headed down the hall to Twilight Sparkle's office at the School of Friendship.

"Yeah, I wonder what it is this time." Rainbow Dash rolled her eyes.

"Shh." Rarity hushed Rainbow Dash as they got close to the door to Twilight's office. They could hear Twilight's muffled whimpering and moaning through the door. Rarities horn glowed as she magically pushed the door open just a crack and the two mares stared through across the office. They could see Twilight slouched back awkwardly on a chair behind her desk. Her mane was in slight disarray and her head was pitched even further back as she panted and moaned quietly. Her front hooves were held down out of sight beneath the desk.

"Oh my gosh is she-" Rainbow Dash snickered, interrupted by Rarity's hoof in her face.

"Um. Twilight Dear?" Rarity called through the door.

"Come in!" Twilight's voice cracked as she laughed nervously. She blushed red and she snapped back into a more natural posture.

"You wanted to see us both?" Rainbow Dash quizzed as the two entered Twilight's Office.

"Well you two did such a great job on that mystery I sent you two on." Twilight began. Rarity and Rainbow Dash could see that she was fussing with her front hooves beneath the desk.

"You mean that fake mystery?" Rarity rolled her eyes indignantly.

"No!" Twilight whispered loudly as she looked beneath the desk. "I mean yes. I'm sorry if my methods were a little unconventional." She laughed nervously as she continued fussing with her front hooves.

Out of Rarity and Rainbow Dash's sight Starlight Glimmer hid, prone, beneath the desk. She flashed a devilish, seductive, grin up at Twilight when she quickly glanced below to tell Starlight off. Starlight was trying to reach a front hoof past Twilight's midriff but Twilight kept fighting her off with her front hooves.

"It was totally awesome and fun... but uncool to deceive us like that!" Rainbow Dash lectured.

"Though we did make a fabulous team!" Rarity interjected as she reached a hoof over to Rainbow Dash. Rainbow Dash clopped her hoof against Rarity's and the two held their hooves together for a moment.

"Well that's the thing. Now the School of Friendship has- Unh!" Twilight interrupted herself with a moan. Beneath the desk Starlight's horn glowed as she used her magic to directly stimulate Twilight's clitoris. "a real mmm... mystery" she slouched back up onto the chair behind her in surrender.

"Are you okay, darling?" Rarity asked with concern.

Starlight crept closer and took advantage of Twilight's posture. She pressed her muzzle between Twilight's hind legs and her tongue went straight for Twilight's clit.

"Oh!" Twilight moaned. "I'm... Fine" she panted. "It's a little hot in here isn't it?" She reached below the desk with her front hooves and gently stroked Starlight's mane.

"Actually I'm a little chilly" Rainbow Dash rolled her eyes as she replied in a skeptical tone.

Starlight's head bobbed as she held her tongue stiff and worked it back and forth over Twilight's clit. Twilight struggled to keep a straight face as she panted and moaned.

"So-Ooh" Twilight's eyes rolled back as a look of ecstasy washed over her face. "I was thinking you two girls could mmm maybe investigate for me."

"Well of course, darling, anything for a friend, right Rainbow Dash?" Rarity looked over at Rainbow Dash.

"Right!" Rainbow Dash confirmed.

As Starlight continued to lap at Twilight's clit her horn started to glow. Magical force parted Twilight's vulva and a glowing, phallic concentration of magical force began to penetrate Twilight's pussy, in and out, in rhythm with her tongue. Rainbow Dash and Rarity flashed a very confused look at Twilight as she panted and moaned.

"Are you sure you're alright darling? We could run and grab the nurse for y-"

"Unh! I'm fine!" Twilight insisted with a moan. Her body quivered with pleasure as she stroked Starlight's mane in rhythm with the onslaught of pleasure.

"Why don't you explain this mystery to us..." Rainbow Dash rolled her eyes at Twilight.

Twilight simply nodded in reply and breathed hard. She began bucking her hips in rhythm as Starlight increased her pace and penetrated deeper with the magical phallus. Twilight brought one of her front hooves up and bracing herself against the desk with it. "mmm! There's been reports.. Ohh!... of strange... mmm!... activity..." Twilight could barely get the words out coherently.

"There's some strange activity in here." Rainbow Dash rolled her eyes again.

Twilight let out a gasp as she reached orgasm. Her muscles all tensed and shuttered. Starlight scuttled back as Twilight slumped forward against the desk. Twilight panted as she caught her breath.

"Darling?" Rarity leaned forward and prodded at Twilight's face. She wore an almost demented look of satisfaction.

"Hehe! yeah..." Twilight chuckled nervously. "So there's been some reports of strange activity around the campus at night. Plus students and faculty have been acting...unusual." Twilight explained as she perked back up into her usual posture.

"Unusual, how?" Rarity inquired.

"Unusually, uh, amorous. We're worried that it might be some kind of magical curse." Twilight blushed and grinned nervously as she explained.

"I'll say" Rainbow Dash rolled her eyes at Twilight. "Wait, we?" She quizzed, finding the choice of words odd.

"And since you two have been away on a friendship mission all week it seems you haven't been afflicted yet." Twilight looked over at the duo.

"We're on the case!" Rarity piped up. Twilight nodded in reply.

The two trotted out of the room and closed the door behind them. Starlight Glimmer emerged from beneath the desk. Her and Twilight kissed passionately.

"I might have to hold you here late on bad behavior." Twilight smirked smugly at Starlight.

"I guess some ponies never learn." Starlight said seductively, gesturing at herself and winking an eye.