Ponychan Write-off
"What Lies Beneath"
Mild sexual content.
"Wait! Don't come in!"
Rainbow Dash raised an eyebrow and pressed an ear to the door. Shuffling... sounded like Twilight was throwing around her covers? “What do you mean don't come in? What, are you not decent or something?”
“Um, yes! Not decent.”
“Oh, right. Buck naked, I'll bet.” Rainbow Dash rolled her eyes. Twilight wouldn't be able to see it, but Rainbow Dash was sure her sarcasm would be plenty apparent from her voice. “How could you possibly be doing anything that you wouldn't want me to see?”
She pushed the door open. There was a flurry of movement, and Twilight sat guiltily in bed, holding the blanket close to her chest.
“Seriously?” Rainbow Dash furrowed her brow. “Is there something I should know about? You got a rash going on or something?”
“I... No, there's no rash. I just, um, I'm feeling sort of...” Twilight looked so nervous that Rainbow Dash thought she could hear her marefriend's heart thumping.
And then she smelled it. That distinctive scent that always reminded Rainbow Dash of some very nice memories. She let out a long, mocking snort.
“Is THAT it? Come on! We've been living together how long and you're still embarrassed about that?”
“Um... Right! S-sorry, I know you like me being open and--” Twilight yelped as a blue bolt of pegasus suddenly flashed into bed on top of her.
“And I know you like having a few things open too.” Rainbow Dash's grin was wolfish. “Lucky for you I'm in the mood for some fun.”
She planted her hooves on either side of Twilight's head, but Twilight still looked scared. Rainbow Dash suddenly flipped from playful to concerned. “Twilight? Usually you love this kinda thing.”
Twilight nodded unconvincingly. “Oh, I do... Mmmm, Rainbow Dash, I love lying beneath you and--”
Rainbow Dash shook her head. “Don't give me that. Loyalty, remember? I don't want this to be just for me.” She leaned down and kissed Twilight at the base of her horn, which got a wonderful shiver out of her. “I love you, Twilight. I'd die for you. You know that.”
Twilight nodded and suddenly reached out to pull Dash into a tight, horizontal embrace. “I'm sorry,” she whispered, burying her face in Dash's shoulder. “I love you, Rainbow Dash. I'm sorry.”
Rainbow Dash ran a hoof comfortingly through Twilight's hair, trying not to let her confusion show. Twilight had some strange moments, but this was an odd one even for her. Rainbow Dash thought she heard a whimper, but from another room in the house. She raised her head away from Twilight and looked over her shoulder.
“Did you hear that?”
“No, I didn't. I mean—hear what?” Twilight seemed to shrink backwards into the bed. Rainbow Dash kept staring at the door, but she didn't hear or see anything more.
“Never mind. Now if you don't mind, I had been about to take care of the little problem of yours that I smelled on the way into this room...”
Twilight made a happy little noise as she rolled the sheets back with her magic. Rainbow Dash snuggled close to her unicorn lover, and then Twilight pulled the blanket over their heads.
Underneath the bed, Rarity took her hoof out of her mouth and pressed her hooves against her ears instead. It didn't matter if she was crying now; the lovers in the bed above her wouldn't hear anything thanks to the noise they were making themselves.
The ONLY reason I wrote this is because I thought it was a clever use of the prompt. Also because I wanted to push limits and write something that other people wouldn't write. So, this is crap. Sorry. People were able to guess who I was immediately from this, because I'm the only pony with the balls to write something like this for a contest.
No, I don't ship TwiDash, though it's awfully cute. The character being cheated on was definitely going to be Rainbow Dash, but the other partner couldn't be Applejack for pretty obvious reasons. I didn't consider Pinkie Pie while writing this, but I wouldn't have done that either.