Title: The Mistress

Summary: Andrea Sachs sends her boss Miranda Priestly a naughty instant message, and Miranda is prepared to make her pay...or is she? Mirandy / Miranda/Andrea, lots of smut. Be warned.

Rating: Mature / Explicit (language, leather, bdsm)

Disclaimer: I don't own The Devil Wears Prada. The idea for this is very loosely based on an X-Files ff I read years ago called Cachot Desirer by Donnilee and Xrae...one of those plots I could never get out of my mind, so kudos there.

A/N: I was going to write this as a one-shot, but changed my mind. No new chapters yet, as I'm still trying to decide where I want this to go. So, please R/R to keep me motivated!

The Mistress

Andrea looked up as Emily giggled, her cheeks blushing as she typed, no doubt responding to an instant message from Serena, who was supposedly in a meeting with Miranda at the moment. Andrea sighed, wishing she had someone to chat with, seeing as it was looking like a long afternoon.

It was a little-known fact that Runway—and all of Elias-Clarke, to be honest—utilized the Microsoft Communicator platform integrated into their Outlook inboxes. It was a great collaborative tool, as it allowed screen-sharing and video conferencing, though Miranda always preferred everyone to attend meetings in person.

Throughout the day, Emily and Andrea often messaged each other so they could keep the chatter down, and as was the situation right now, Andrea was witness to several inappropriate chats between Emily and Serena.

Miranda was always signed-in and available, which was true…she was never unavailable from work. She rarely chose to communicate with her staff in such a juvenile medium, however, she did find that IMs came in handy for issuing orders while she was on the phone or in a meeting. For her, it was a built-in multitasking tool, which meant that Andrea and Emily never really got a break.

Several weeks ago, Emily received an IM from Miranda late one evening, demanding that her Starbucks be in her hand in no less than fifteen minutes. Somehow, Emily managed, let herself into the townhouse and handed the Starbucks to Miranda, who was sitting in the den reviewing the Book that Andrea had delivered hours prior. "I didn't order this," Miranda told her brushing her off and focusing her attention back on the Book. It wasn't until Emily approached the door that she heard the twins snickering on the staircase. The next morning, Miranda asked Andrea to "fix" her computer, explaining that the twins were using it for something and now she couldn't find anything.

But today, today was a calm Thursday afternoon. Miranda was meeting with Nigel, Serena, and Jocelyn in the conference room down the hall, and Andrea had nothing to do except wait for the Book that evening. Andrea heard the conference room doors open and heard footsteps clacking nearer, one set Miranda's, the other undoubtedly Serena's.

Andrea quickly clicked on the name in her buddy list and typed:

Oh god, she's so fucking sexy….

Andrea watched as Emily typed, then a response appeared on her screen:

To whom are you referring?

Andrea quickly replied:

Cut the innocence. Admit it, you wish you were licking her creamy, wet cunt right now.

The moment she clicked 'send' she noticed Emily was not paying attention to the screen at all. Fear began to flood through her veins and her heart rate skyrocketed. "Good lord, what is your problem, Andy?" Emily asked sharply, holding her hand over the receiver of the phone. "Miranda is going to see you," she warned.

Andrea quickly signed out of Communicator and restarted her computer. As if that could erase the message. She stood and walked into the kitchen, putting a few mugs into the dishwasher and all in all trying to remain inconspicuous.

"Andrea," Miranda called. "Tell Roy to be downstairs in two minutes," she said, motioning for her coat and bag. Emily called Roy while Andrea retrieved the items from the small closet. "Oh," she said as Andrea handed her the coat, "You're coming with."

Andrea quickly grabbed her own coat and bag, then shrugged to Emily as she followed Miranda to the elevators. Andrea stepped back while Miranda stepped into the elevator, but Miranda quickly threw her arm against the doors to keep them from closing, signaling for Andrea to join her. Miranda stared at Andrea for a full sixty seconds as the elevator descended to the main floor. Andrea felt the editor's eyes burning a hole in her and for some reason, chose to look up, startled at the fire blazing behind those typically cool crystal blues.

"I'm so so sorry," she sobbed, raising her hand to cover her face. "It was a joke. I meant it for Emily. It was inappropriate," she said, sobbing between sentences. "I shouldn't have said that at work. I'm so, so—"

"Stop it," Miranda scolded her. "I would never have expected such language from you, sweet, innocent, homegrown Andrea Sachs from Ohio. But I do believe I've uncovered another side to you, and this will be very interesting," Miranda said with a smirk as they stepped off the elevator and into the lobby.

Andrea trailed behind and slipped into the backseat with her, her fear of disobeying Miranda outweighing any fear for her life at the moment, not to mention her growing, inappropriate feelings for her boss.

"Roy," Miranda called. "To Alix."

"Yes, Miranda," he replied. "Your bag is in the trunk," he added, slipping the privacy screen up.

"Where are we—"

"Do not speak," Miranda said.

"But, Miranda, listen, please, it was stupid. I'm sorry. Fire me or whatever you need to do, I'll leave & you'll never see me again, but god, don't kill me!" Andrea pleaded.

Miranda's lips curled up in a predatory smile as she looked over at Andrea, begging, pleading. "How dare you think me capable of murder. Really, Andrea. And I never said I didn't want to see you again," she said. "We are going to an exclusive club where people like me can go for complete privacy and…and relaxation," Miranda said, softly brushing her arm along Andrea's. When Andrea jumped and threw herself at the door, Miranda continued, "Good god, Andrea. Relax. I have a feeling you might even enjoy yourself."

Andrea crossed her arms tightly across her chest. She was beyond confused. What did Miranda mean? If she didn't intend to kill her, why was she taking her to this private place? Maybe she was planning to kidnap her instead, Andrea thought.

Soon, they arrived at what looked to be an old, abandoned warehouse. Miranda opened the door and stepped outside, gesturing for Andrea to follow. Roy handed Miranda a large Louis Vuitton duffle that he retrieved from the trunk and pointed up ahead where he would park the car and wait.

"Andrea, leave your cell phone in the car," Miranda instructed. "I left mine, too," she said, pointing to the silvery object in the cupholder.

The lump in Andrea's throat grew in size as she left her phone—her only means of communication with the outside world, with 9-1-1, in the back of Miranda's car. "Come along!" Miranda called as she proceeded into the building. Andrea did not dare disobey, following her inside.

Miranda punched a few numbers into the keypad, hidden along the doorway under what looked to be a piece of scrap metal on a hinge. The door swung open and Andrea followed Miranda inside, into the plush reception area.

"Miranda," a young blonde woman at the desk greeted the editor, bowing her head ever so slightly. Miranda's head was held high, as always. "You, you didn't schedule an appointment. I'm afraid that—"

Miranda raised her hand, interrupting the woman. "I brought my own—err,—a guest today," she said. "I trust you can fit us in, perhaps three or twenty-one?"

"Oh," the young woman exclaimed in surprise, her eyes flitting between Andrea, Miranda and the computer screen in front of her. "Oh, I understand. Twenty-six is available, and if you recall, it's—"

"That will do," Miranda said.

"Follow me," the young woman said, stepping through a curtain into the back.

"Keep your eyes down, Andrea. You look at nothing except the floor," Miranda warned. Andrea did just that, following Miranda's footsteps until she heard the click of a lock, when she stopped, realizing they were alone, locked in a room.

"May I raise my eyes, Miranda?" Andrea asked shakily.

This is going to be far easier than I imagined, Miranda thought. "No, not yet." Miranda quickly opened her duffle bag and stepped out of her dress, slipping on a handmade leather harness-suit. "You may raise your eyes, Andrea," she said.

Andrea slowly looked up and her eyes roamed the room with several tables of assorted sizes, each with hooks hanging at odd angles. As she slowly turned around, her eyes met Miranda and her pulse quickened, letting out an audible gasp.

"Silence!" Miranda said. "Andrea you have to follow certain rules here, do you understand? You do not make eye contact without permission. You only speak when I give you permission or ask a direct question, and you must respond immediately. Your answer is 'Yes, Mistress' or 'No, Mistress.' If you wish to ask a question, you ask, 'May I ask a question, Mistress.' And when we are here, I will refer to you as Pet, is that clear?"

Andrea hesitated as her eyes continued to roam Miranda's body—the black thigh-high tights and Manolo Blahnik stilettos, the perfect swell of her breasts, her nipples visibly straining against the leather. It looked like a one-piece leather bathing suit, Andrea thought, except with less coverage and more straps. Andrea's tongue slipped out, wetting her lip.

"IS THAT CLEAR?" Miranda's voice boomed.

"Yes, Mistress," Andrea said quickly, averting her eyes to the floor.

"There, that was very good. Did you see something you liked?" Miranda asked. After no response, Miranda added, "You may answer, my Pet."

Andrea felt a chill through her insides as Miranda just commended her. "Yes, Mistress."

"Tell me, my Pet, what did you like?"

"Your breasts, Mistress."

"If you're a good Pet," Miranda purred, "I may see fit to reward you. But remember, you do not touch unless you have permission."

"Yes, Mistress."

Miranda reached in her bag and pulled out a deep green satin corset and thong. "Put this on," she said, tossing the garments at Andrea's feet.

"Okay," she said, bending town to pick them up.

"Okay what?"

"Sorry. Okay, Mistress, Yes, Mistress."

Miranda watched as Andrea quickly slipped off her clothes and undergarments, stepping into the thong and lacing up the corset. "Mistress, may I ask a question?"

"You may."

"Should I leave my shoes and tights on?"

Miranda thought for a moment. "No, remove them."

"Yes, Mistress," Andrea responded, quickly discarding her shoes and thigh-high hose.

Miranda placed her hand on the young woman's shoulder, leading her towards the wall. "Raise your arms," she said. Andrea did, and Miranda fastened her wrists in the soft leather cuffs on the wall.

"There is a safe word," she said, "If this becomes too much and causes you too much pain, you simply need to say 'freesia' and I will release you. Do you understand, my Pet?"

"Yes, Mistress," Andrea said, her body shaking.

"Spread your legs," Miranda directed. Andrea did, and Miranda walked up behind her. In this position, Miranda was slightly taller than Andrea, and that was what she preferred.

"Now, my Pet, you are here for my pleasure and mine alone," she said as her fingertips slowly traveled down Andrea's neck, her back, over the curve of her ass and down the inside of her thigh. "You do not come unless I tell you," she said, cupping Andrea's sex from behind. "Do you understand?" she whispered into her ear, her tongue grazing Andrea's earlobe.

"Yes, Mistress," she moaned.

"Good," Miranda purred, squatting down between Andrea's legs. Miranda leaned her back against the wall as she took in the sweet scent coming from the young girl's juncture, practically pressed against her face.

"May I ask a question, Mistress?"

"Yes," Miranda said.

"May I open my eyes, Mistress? I was instructed to look down, but not to look at you, which is impossible at the moment, Mistress."

Miranda cracked a smile. Oh, Andrea would be fun, she thought. "Yes, my Pet. How thoughtful of you to ask. I am very pleased with you so far, and I will permit you to open your eyes so you can see me, here between your legs, so that you remember to whom you belong."

"Thank you, Mistress," Andrea wailed as Miranda pushed away the small strip of fabric and pressed her tongue to the young woman's lower lips. Andrea felt Miranda's nails as they firmly held her ass, kneading and squeezing.

"Ohh, my Pet, you taste so delicious," Miranda moaned as she licked. "This creamy, wet, cunt is all mine, isn't it, my Pet?"

"Yes, Mistress," Andrea replied.

"Isn't it?" Miranda repeated.

Andrea hesitated for a moment, unsure of what to say in response. "Yes, Mistress. It's yours, Mistress. My cunt is all yours," she said as she arched her back and presser her hips harder into Miranda's face. The sight of the silver-haired editor on her knees between her legs was incredibly arousing. Andrea gasped aloud as Miranda slowly slid her tongue away and stood behind Andrea.

"Tell me how that made you feel," Miranda purred in Andrea's ear.

"Oh, god, Miranda" Andrea moaned.

"What did you say?" Miranda asked.

"I said oh, god, Mi—Mistress! I'm sorry, Mistress!" she cried.

"Oh, my Pet, you were doing so well. I think I have just the thing to keep you in line," she said, returning to her bag. When she returned, she stepped behind Andrea and wrapped her arms around her. Andrea felt the leather pressing into her backside and struggled to keep silent and still, wanting so badly to turn around.

Miranda slowly slid her hands up Andrea's corset and carefully slipped out her right breast, baring her nipple to the open air. Miranda flicked it with her fingers a few times, then placed a nipple clamp on and stuck it back inside the corset, repeating the process with her other breast.

"My dear Pet, you need to breathe," Miranda said tracing her hands down Andrea's sides. "Can you take a deep breath for me?" Miranda asked, knowing the strain it would place on her newly sensitized nipples.

"Yes—ohhh fuck—yes, Mistress," Andrea howled, panting.

"There, that's better," Miranda said. "I want to see your chest rise and fall with each breath, my darling Pet." Miranda reached up to the cuffs. "I'm going to take your hands out of these cuffs, but you are to remain still," she instructed. Miranda uncuffed her wrists and led Andrea over to a small table where she instructed Andrea to lay on her back.

Miranda reached into her bag again and returned with a small silicone vibrating dildo. "Bend your legs," she instructed. Miranda pulled the green satin thong off and slowly inserted the dildo between her folds. After several moments, she twisted the base and it began to vibrate.

"Now, my Pet, you must keep this inside. Do not let this fall out or I will be very disappointed in you."

Andrea nodded, "Yes, Mistress. It won't happen, Mistress."

"That's good. That's very good. Now, keep your eyes closed," Miranda said as she slowly reached over and tied a black silk scarf over Andrea's eyes before climbing onto the table.

"Mistress, may I ask a question?"

"Yes, my Pet."

"Is this pleasing you, Mistress?" Andrea asked breathlessly.

Miranda smiled, genuinely. Leave it to Andrea to ask that. "Yes, my Pet," Miranda said, softly stroking Andrea's cheek.

Miranda climbed the table and stood on her knees, straddling Andrea. "Now, Pet, you have been very good, and I am very pleased. I promised you a reward," she said, leaning forward, taking her weight on her elbows as she pushed down the leather, exposing her breasts which dangled inches above Andrea's lips. "Suck me," Miranda said, letting her nipple touch Andrea's tongue. "Suck me, my Pet."

Andrea frantically opened and closed her mouth, licking, reaching, moaning as she latched onto Miranda's nipple, sucking like her life depended on it. "Ooh, yes, yes, yes—ahh—harder, bite me, Pet!" Miranda cried as Andrea's lips and teeth sent ripples of pain through Miranda's body.

When she was sufficiently aroused, she gently patted Andrea's cheek. "Now, my Pet," Miranda said, "You have made a mess." Miranda moved closer up Andrea's body until her hips were straddling the young woman's face. "You need to clean up your mess, Pet," she said.

As she pressed her wet folds to Andrea's lips, she reached back and unclamped Andrea's nipples, leaning backward and resting one hand on the table as the other massaged and tugged the swollen pink buds.

"How does it taste, Pet?" she asked.

"Mmm," Andrea moaned into Miranda's folds. "Mistress, thank you. You are so beautiful, Mistress. You taste so good, Mistress. I love you, Mistress," Andrea babbled. "Please, Mistress, I'm so close," she moaned as she continued to lick her folds.

"My Pet, you must remember why you are here—for my pleasure. You cannot come before me."

"Yes, Mistress. May I ask a question, Mistress?"

"Go on."

"May I use my hands, to assist in your pleasure, Mistress?"

"You may, my Pet," Miranda responded.

Within seconds, Andrea's fingers were penetrating Miranda while she sucked on her sensitive bud. Miranda felt the coil within her grow, starting in her thighs and spreading. Her senses were clouded by the impending orgasm as her blood rushed through her body. Andrea was rhythmic, Miranda noticed. Pump, suck, pump, suck, pump, suck, lick, lick, lick, lick, lick. The rhythm repeated over and over as Miranda wailed, her hands reaching out in the air to grab something, anything to help her maintain control. No, this wasn't supposed to go like this, she thought somewhere in the back of her mind. Not the first time.

Suddenly Andrea felt Miranda's muscles quiver and go rigid, a breathless gasp let out in the silent room. Miranda's torso was contorted, her mouth in a perfect "O." "Come, my Pet, come NOW!" she cried, her voice crackling just as Andrea's teeth grazed her clitoris, sending her spiraling over the edge.

Upon hearing Miranda's words, Andrea felt her own muscles tighten as little explosions sent a flood through her veins. "Oh god, Mistresssss!" Andrea cried, her senses overloaded between the vibrator, the blindfold, and the smell of Miranda's glistening cunt in her face.

Miranda slowly climbed off the table, slightly unsteady on her feet. She removed the dildo carefully from Andrea's body and turned it off. Picking up the nipple clamps, she reached over and untied the silk scarf, tossing all the items into her bag. There was a shimmer across Andrea's lips, her chin, and the tip of her nose. Miranda could not resist, and softly leaned over to lick her own come off Andrea's face.

Andrea's eyes fluttered open and she fixed her eyes into the ceiling above her. "May I ask a question, Mistress?"

"Yes," Miranda said, licking one last spot underneath her chin.

"Did I please you, Mistress?"

"Oh yes, my Pet. Very much," Miranda said. She stood and picked up Andrea's clothes, placing them in a neat pile near her feet before grabbing her own dress.

"Andrea," she said, "I am going to take a shower. I suggest you do the same—there is one through the back door you may use. I will meet you in the car," she said, stepping out the door and down the hallway to the private showers.

The moment Andrea heard the door shut, she pushed herself up and off the table. Her legs felt like jelly and her head throbbed to the point where she felt her pulse beating in her temples. What just happened? she thought. All she knew was she needed to leave before someone else saw her.

She threw her hair into a ponytail and quickly jumped into the shower and washed, her hand tracing the area on her face that Miranda had licked not long ago. Shutting the water off, she slipped her clothing back on, grateful that she had semi-clean underwear, and buttoned up her coat, tossing the green corset into her large bag.

She soon found her way out, walking back through the lobby, keeping her head down as she sped up, eager to be in the comfort of the backseat. Andrea walked over to the towncar, shutting the door as she stepped inside.

She had seventeen missed calls from Emily and thirty-one text messages. If I could only explain to Em where I've been, she thought. Even she did not think Miranda to be into kinky shit, though it did make sense judging by the way she ran her office. But, somehow, in the course of the past two hours, Miranda revealed another side to her, and somehow, Andrea had become her new Pet. Did she even ask? Andrea tried to recall. What would have happened if I said no? Better yet, how on earth am I going to look my boss in the eye and say, 'Yes, Miranda'?! she thought, her thoughts racing through her mind.

Miranda showered, touched-up her makeup, and brushed her teeth. Satisfied with her appearance, she stepped out and walked towards the lobby.

"Miranda!" the blonde receptionist called. Miranda stopped and turned on her heels. "I, uh, your guest left in a hurry. If things don't work out with her, you know…"

"Claire, sweetheart," Miranda said, softly stroking her face. "I'm a Top. I select my own Subs, and I never select anyone who approaches me," she said, softly patting her cheek before turning to walk out the door.

Miranda was quite surprised to find Andrea already in the car, but pleased at her efficiency. Sliding into the backseat, she nodded and Roy headed back to Runway.

"Andrea, confirm my 4pm with Marc, and see if Nigel has the revised December layout. Tell Emily I expect my Starbucks to be waiting for me and I am not ready for her excuses."

Andrea stared at Miranda, hardly processing the words issuing from her mouth. "So, that's it?" she said. "Just like that?"

"What on earth are you talking about?" Miranda said, annoyed by the young woman's questioning.

"What just happened, Miranda?" Andrea asked.

Miranda sighed, realizing it was too good to be true. "Andrea. What happens at Alix or while we are in our roles has absolutely no impact on Runway." Andrea stared at her, questioningly. "When I lock the door to a room, my Pet and I will change into appropriate clothing, and my Pet will usually kneel, waiting for his or her first command. When we're through, I will address my Pet by his or her name as a signal to drop out."

Andrea's mind raged. "You—you have multiple pets?" Andrea asked.

"No!" Miranda responded, turning to look at Andrea. "No, never more than one. But, yes, in the past I have had others, if that was what you were asking."

Andrea relaxed at Miranda's answer. After several minutes of silence, she said, "What do you mean by 'drop out'?"

"Drop out of the role, Andrea. By dropping out, I go back to being Miranda and you go back to being Andrea."

"So," Andrea said, "did I do okay? Are you still going to fire me for the IM earlier?"

Miranda smiled and held back her laughter. "Andrea, this is not something we discuss outside of our roles. That's just etiquette. And no, I never intended to fire you over that, or anything for that matter. Darling," Miranda said, reaching her hand out and laying it on top of Andrea's hand on the seat, "I never do this, but you were wonderful and so very easy to train. I hope we can do this again sometime. But you mustn't let it affect your demeanor at work," she said. "You're a very good Pet, Andrea," she added, her voice barely above a whisper.

"I won't. I promise," Andrea replied, beaming.

…to be continued