Fluttershy's Biggest Secret

*knock, knock, knock*

Fluttershy and Trixie awoke on their bed, being jolted from their dreams by the abrupt sound. They blinked a few times to clear some of the sleep from their eyes and saw the other pony, tightly hugging and nearly touching muzzles with each other. The unicorn had some light tracks of tears down her face from her dreams which her marefriend looked at with slight concern before the knocking came again.

The yellow pegasus separated herself from Trixie, somewhat hesitantly for both of them, and hopped off the bed while glancing towards the curtained window. The dim, shallow light peeking through it implied that it was only dawn, making the mare question who could possibly be knocking on her door at this time. She then walked over to the door and opened it, her marefriend looking at her with slight worry as she sat up.

“Um, could you stay here?” Fluttershy asked politely while looking back towards the blue mare on her bed. “I don’t want anypony learning about you that doesn’t need to...” She elaborated, mild fear tinting her voice.

“Of course,” The unicorn responded with slight relief. “Trixie thought the same,” She added as she laid down on her barrel, facing the door.

The knock rang out again, a bit louder this time, and called Fluttershy to go down the stairs and walk over to it. When she opened the door, she saw an impatient Rainbow Dash looking back at her.

“Hey, Flutters,” The blue pegasus said casually.

“Rainbow Dash?” The other mare replied, still not fully awake. “What are you doing here? It’s barely morning...”

“AJ told me you wanted to talk about something kinda important,” Dash answered, still completely ignorant of the insane earliness of her arrival.

“Oh...” Fluttershy responded in realization before sighing in dread. “Um, come in,” She stepped out of the way to allow her friend to enter.

The other pegasus closed the door behind her as she walked inside, going over to sit on the couch and looking back at the shy mare with slight concern as she slowly walked towards her.

“Um, so...” The yellow pony started, sitting on the couch next to her friend. “I-I wanted to talk to you about somepony...” She said, fear lacing her voice.

“Uh, okay...” Dash replied, confused as to what could be so terrifying for her.

“It’s, um,” Fluttershy paused, covering part of her face with her mane, “Trixie.”

The other pony took a moment to think before asking, “What about her?”

“She, um...” The yellow mare stopped, glancing around the room while trying to think of the best way to put it. “She’s back in Ponyville,” She said quietly, looking back at her friend.

“What?” Dash asked in disbelief as she stared at the other mare.

“Y-yeah, she’s back and, um, she’s here to apologize to everypony for what she’s done...” Fluttershy responded, lowering her head slightly to cover more of her face with her mane.

The blue pegasus stared at her for several more seconds as she process what was said and noticed her friend’s fear about the subject, concluding that she had something to do with Trixie being back. “What did you do?” She asked with restrained anger, desperately trying not to tackle her.

“S-she came here two days ago, a-and she was crying when she came to me...” Fluttershy began, her eyes starting to tear up, prompting the other mare to lose some of her anger. “She wasn’t able to live in any city, as the ponies there kept chasing her out. Um, so I let her stay here...” She stopped before she had to talk about the other things she did with her.

Dash stared at her friend for a while, contemplating the implications of what she said. After more than a minute, she asked cautiously, “So, she’s been staying with you for the past two days?”

“Y-yes...” The other mare answered, fearful of what she may think about it all.

The cyan pony went silent for a few more seconds, eventually saying with light disbelief, “And that’s it?”

“Um, I’ve told all of our other friends about her too...” Fluttershy replied, becoming slightly relieved at her friend’s calmness towards the situation.

“No, I mean is that all you two have been doing?” The other pegasus asked implicatively, relaxing her body a little.

The yellow mare paused, not entirely sure what she meant, before gasping quietly and leaned her head down. “Y-yeah, t-that’s all...” She responded, but the heavy blush on her face said differently.

Dash stared at her with a face of smug doubt, as if urging her to describe what she’d done with Trixie.

Her friend looked at her with fear and embarrassment, after a few seconds managing to quietly respond, “O-okay, we may have kissed... um, a lot...”

“And?” The blue pony pressed her to continue.

Fluttershy paused, shivering and hiding her face with her mane out of embarrassment before she resumed, “A-a-and we had sex... a-a lot...”

“How so?” The other mare smiled, clearly enjoying teasing her friend like this.

The pink-maned pegasus turned her head away, her blushing growing crimson red as she began to get aroused by the memories she had, covering her crotch with her front hooves to try to keep her cock from showing. Dash laughed in schadenfreude at the display, but that slowly changed to confusion as the yellow hooves covering the respective mare’s crotch started to rise, though clearly not of their own volition.

“Flutters?” Dash asked, somewhat concerned before lowering her head to see what was moving her hooves and going slack-jawed at the sight of her friend’s stallionhood. The well-endowed pony didn’t move as her shaft kept growing, now moreso out of embarrassment than arousal.

When Fluttershy’s cock reached it’s full length, her hooves still pressing into the tip that was now just below her muzzle, a “Whoa,” come from the other mare in utter awe, prompting her to glance back at her friend and see her shock. She then became aroused again, looking at the lithe pegasus entranced by her shaft and noticing the drool dripping from her mouth and the juices flowing from her sex.

She started to pant lightly out of lust as she started to take in the features of her rainbow-maned friend: her tight muscles, her taught flank, her big, strong wings- She gasped as some precum spurted from her shaft and began flowing down its side, drawing the attention of the enthralled mare as she slowly moved her head towards it and drawing another gasp from the yellow pegasus when her tongue made contact with it.

Dash moved her tongue up the shaft, licking the precum trail all the way to the tip and then licking around the flare repeatedly, having to stand up on her hind legs to position her muzzle above it. The licking forced a couple light moans from the well-endowed pony, but their volume was eclipsed by the one that came from her as the other pegasus abruptly shoved the tip of the cock into her muzzle.

Fluttershy let out an elongated groan as her friend pushed her muzzle down the massive stallionhood, slowly making her way down to and past the medial ring, apparently so completely enraptured by the pillar of maremeat that she completely ignored her gag reflex. She started lightly sputtering on the cock as she continued to go down its length, slowing even further until she stopped at the base.

The cock-sucking mare then reached her forelegs forward to try to push on her friend’s crotch, but slipped to press on her balls, drawing a sharp moan from their owner and making her crane her head back in pleasure. The blue pony pressed harder on them as she pulled her muzzle up the shaft, going to just below the medial ring before slamming downwards, forcing another loud moan from the other pegasus. She repeated that action with slightly more speed as she started to cyclically raise and lower her muzzle on the stallionhood, covering more distance and making its owner moan louder with each repetition.

Fluttershy’s moans eventually turned into a squeal as the other mare began to reach the tip of her shaft with each pull, temporarily increasing in volume when her friend’s muzzle sunk to the base a split-second later. The yellow pony felt her orgasm nearing and put her hooves on the rainbow-maned pegasus’ head as it flew along her cock, slightly adding to the force it went down with, and thus the pleasure she felt.

The well-endowed mare’s pleasure built until her squealing turned nearly into a shriek as she came, shoving Dash’s muzzle to the base of her shaft and keeping it there as her cock throbbed, spurting out obscenely large ropes of cum from its flared tip directly into her friend’s stomach and distending her barrel. The cyan pony’s belly kept inflating as the stallionhood stuffed in her throat kept pumping cum out from the balls she was pressing her hooves on and into her stomach, starting to press into the back of her forelegs.

Dash’s expanding belly eventually managed to force her body away from the shaft lodged in her muzzle, her backside being pushed away then upwards off the couch, her front half practically fixed in place from how tight her muzzle was around the massive stallionhood. Her hind legs came off the couch next, her body starting to rotate to a vertical position where it would be nearly impaled on the huge shaft shoved into her mouth. Eventually her body did move into that position as her inflation slowed down, her muzzle being completely unable to move from where it was stuck on her friend’s cock as she lost consciousness from the overwhelming pleasure (and lack of air).

When Fluttershy’s orgasm finally came to an end, her screaming changed into panting while she noticed the absurdly oversized belly of the other pegasus. She took her hooves from on top of the blue mare’s head and put them on bottom, starting to force it upwards off her cock, making her gasp lightly from the pleasure in put on her now sensitive cock. The unconscious mare’s muzzle came off with a wet pop, her body slowly rotating on her cum-filled belly to be on top, making the other pony slightly giggle as she laid back on the couch for several seconds before she heard some movement at the top of the stairs.

A sapphire-coloured unicorn could then be seen descending the steps slowly, lightly shivering from the arousal she got from hearing the lewd sounds downstairs. When her eyes saw through the banister at the scene below her, she paused as she saw the cyan cum balloon on the couch next to her lover, noticing her rainbow coloured mane and lightning bolt cutie mark.

“R-Rainbow Dash?” Trixie questioned hesitantly as she resumed descending the stairs.

“Y-yeah...” Fluttershy responded tiredly, her stallionhood now flaccid and beginning to retreat into her body while she sat up to look at her marefriend.

The sounds of panting and light hoof-steps were the only noise that could be heard until the unicorn reached the base of the stairs and timidly asked, “Um, d-does she forgive Trixie?”

The yellow pegasus took a moment to remember the conversation she had with her friend before replying, “...I think so.”