Something in common after all.

"Did you catch that suspicious pony?" Rarity asked Rainbow Dash as they met back up in the hall.

"No but I found out an ancient Hippogriff relic known as the Amory Stone might be involved. Also that this school sure does have a lot of secret passages." Rainbow Dash explained as the two walked down the hall.

"That sounds more like your line of investigation, Darling" Rarity rolled her eyes. "I managed to secure a lead of my own." Rarity showed the purloined note to Rainbow Dash.

"Maybe there's a secret passage in the book store!" Rainbow Dash blurted.

The duo made their way to the campus book store.

"Classes would be out soon so we would only have a little bit of time to look for clues before the hoofsteps of the students would destroy any evidence." Rarity thought to herself. "Just outside the book store I saw what appeared to be a fleck of paper confetti on the ground." Rarity picked up the fleck of confetti and stared at it intently.

"What are you doing? You haven't said a word since we got here!" Rainbow Dash complained.

"I'm investigating!" Rarity belted back indignantly as she cocked her head up. Rainbow Dash just replied with a roll of her eyes.

Rainbow Dash followed Rarity into the book store as she followed a vague trail of the paper confetti to the 'little fillies room'. Rarity looked over to Rainbow Dash and then gently tested the handle. It was locked. A little red insert below the lock indicated that it was occupied.

"I guess we wait." Rarity sighed. The school bell sounded, followed by the sound of rabble as students started filing into the halls.

"Why dont' we take a break and come back tonight?" Rainbow Dash suggested.

"Good idea, Darling. We'll show up before 2 AM and catch the students off guard." Rarity agreed.

The duo quietly stalked their way back to the book store through the campus halls later that night. As they approached they could see that the security shutter of the book store was raised just enough for a pony to crawl under. They both walked up at the same time and peaked under it. There was only pale lantern light lighting the interior but they could see that there was a large line of male students lined up at the stallions washroom but none at the little fillies room adjacent to it. A small dividing wall created a few hoof-steps of privacy between the two washrooms.

"Do you think we can sneak there without being seen?" Rarity whispered.

"Piece of cake." Rainbow Dash whispered back. She hovered over Rarity and held her front hooves around Rarity. In a flash she darted, Rarity in tow, behind the dividing wall and the two mares quickly ducked into the washroom and quietly closed the door.

Rarity's horn glowed and lit up the room. She could see a confetti trail leading toward the far wall behind the toilet where it abruptly ended. She probed a hoof along the wall and felt a slight draft.

"I do believe secret passages are your forte, darling." Rarity smiled at Rainbow Dash.

Rainbow Dash began feeling around the wall for anything out of place. Rarity checked herself out doing 'detective' poses in the mirror above the sink. The door burst open unexpectedly and Silverstream and Ocellus sauntered in. Both duos froze up and gasped when they noticed each other.

"m-miss Rarity? m-miss rainbow Dash?" Ocellus stammered.

"Ladies! I don't know what you two are up to sneaking around so late but get back to your dorms now! We'll talk about this in the morning." Rarity lectured under her breath.

"But we're supposed-" Silverstream piped up.

"Do you want to get expelled?" Rarity threatened. Ocellus and Silverstream hung their heads and nodded and then strolled off.

Rainbow Dash went back to feeling around for a way to open the secret passage.

"Um, Darling?" Rarity called to Rainbow Dash, directing her attention to the wall leading to the adjacent stallion's room. They hadn't noticed on their way in but there was a hole in the wall leading between the two rooms, and an eager, throbbing, black and white, stallion cock was now sticking through.

"Oh my gosh, it's a gloryhole!" Rainbow Dash giggled.

"A gloryhole?" Rarity raised an eyebrow.

Rainbow Dash whispered into Rarity's ear.

"Well, I never! That is just so filthy and unladylike." She huffed.

Rainbow Dash reached a hoof over and started stroking the cock and holding it towards Rarity's shocked face. "Well you have to do something! You sent the girls away and they are expecting somepony to be here!" She urged. "Otherwise our cover will be blown."

"Why me?" Rarity whined.

"Because I have to keep looking for a way to open the passage!" Rainbow Dash rolled her eyes.

Rarity reluctantly cupped her front hooves on either side of the cock and started stroking up and down the shaft. "But this is one of our students! This is absolutely improper!" She protested.

"It could be anypony, that's what the wall is for." Rainbow Dash rolled her eyes at Rarity as she placed a hoof on the back of Rarity's head and pushed her face closer to the cock.

Rarity whimpered as she slowly worked her mouth around the tip of the mystery stallion's cock. She started bobbing her head, sliding it in and out of her mouth. Rainbow Dash gave her an encouraging pat on the back and returned to her task of examining the wall.

After a while Rarity found herself strangely aroused at the whole affair. She reached one of her front hooves down and started stimulating herself as she continued sliding her mouth up and down the cock with escalating vigor and enthusiasm. The cock stuffed in her face muffled her moans into "mmm"s and she could tell the young stallion on the other side was pleased by the humming as his muffled moaning and grunting could be heard through the flimsy wall. Rarity froze in confusion as she heard him knocking his hoof against the other side of the wall.

"Careful! That means he's going to-" Rainbow Dash tried to warn.

"Ulp!" Rarity sounded as her cheeks ballooned outward. The cock softened and retreated back to the other side of the wall. She looked over at Rainbow Dash and opened her mouth wide, showing off the load of cum in her mouth...some of it dripped off of her tongue and onto the floor. She then closed her mouth and swallowed the load down.

"You were totally awesome!" Rainbow Dash beamed proudly.

"Well that wasn't so bad." Rarity sighed.

"Well you're not done yet. Don't forget the big lineup!" Rainbow Dash pointed Rarity's attention back to the hole in the wall. This time a semi-flaccid dark blue cock came through the wall.

Rarity sighed and then went back to her 'duty'. The cock quickly stiffened in her warm, wet mouth. As the time dragged on Rarity made a game of it; figuring out which cock might belong to which student based on it's color.

Finally a familiar green cock came through the wall. Rarity knew it was Sandbar's. Rainbow Dash reached over and started stroking it with one of her front hooves while pointing to the, now open, secret passageway with the other.

"Good work, Darling." Rarity smiled.

Rainbow Dash playfully lashed her tongue against the head of Sandbar's cock. The two mares flashed each other a grin and gave each other a quick kiss on the mouth.

"We got this together!" They nodded approvingly as they spoke in unison.

The duo gently kissed their way up opposite sides of Sandbar's cock and met each other's face at the tip and kissed each other passionately. Rainbow Dash pushed Rarity's head down and Sandbar's cock disappeared down her throat. Rainbow Dash held Rarity's head with one of her front hooves and reached down and began stimulating her with the other. "mmm" Rarity moaned as Rainbow Dash forced her head up and down.

Rarity thrashed free and gasped for air, pushing Rainbow Dash's hoof away. Rainbow Dash whispered into Rarity's ear and Rarity grinned and nodded. Rarity turned her hindside to the cock and slowly backed up into it. Rainbow Dash grabbed it with her hoof and guided it into Rarity's pussy. Rarity arched her back and moaned as Sandbar thrusted in and out of her anonymously from the other side. It didn't take long for him to cum inside her and pull away. Cum dripped down from her pussy. Rainbow Dash stared in her direction.

"Finished already? Not much of a gentleman." Rarity huffed with frustration as she turned her nose up and then looked toward the secret passage. Her eyes widened and she let out a moan of surprise as she quickly peered behind and saw that Rainbow Dash had her muzzle pressed up behind her, lapping up the overflow of cum.

When Rainbow Dash had finished cleaning her off she worked her way down to Rarity's clit. Rarity moaned loudly and braced all four hooves tightly on the floor as Rainbow Dash strummed her clit with her tongue. It didn't take long for Rarity to reach climax. They kissed each other passionately and then embraced for a while.

"Looks like that's the last of them." Rarity said as she peered through the hole in the wall, the room on the other side was now empty.

"I guess we have something in common after all!" Rainbow Dash said excitedly.

"Yes, Darling. Maybe we should have our next fun day here." Rarity giggled. "Though I suspect that Amory Stone had something to do with it." her tone lowered and her face sank.

"Well that's the thing." Rainbow Dash brushed a front hoof over Rarity's back comfortingly. "The Amory Stone is just a powerful aphrodisiac, so it just makes you REALLY horny. But it can't actually make you do anything you don't want to do." She explained. The two mares smiled at each other.