Fictional story.
Special thanks to "Blackstallion21" for his help editing.
"You're late Bill. I only have the room for an hour; you were supposed to be here five minutes ago" Andy complained.
"It's not my fault, " Bill answered. "We got stuck in a slow elevator, didn't we Mary?"
"Yes Master Bill, "she whispered as she stared at the floor. Both men burst out laughing.
"Maybe I should have her call me master also" Andy said. "Would you like that Mary, want to call me master also?"
"Oh no sir, I don't think I'd like that" Mary said.
"Well as you've probably figured out by now" he continued, "What you want doesn't count for shit. From now on you will address me as master. Understood?"
"Yes Master," she obediently said.
"Come along than Mary we have lots of work to do," Andy told her as the guided her into a private room. "Get your clothes off and let me look at you Andy commanded." Mary removed her clothes praying no one would walk in or look through the little window in the door. Standing nude before Andy, he circled around her sizing her up from every angle.
"Your legs and ass are pretty good, but you still have a good deal of baby fat to get rid of," Andy told her. "I've been given the task of getting you into shape Mary, any way I see fit. You will come here three days a week for an hour and work your ass off. If you do as you're told and work hard we will get along just fine. If you give me any trouble at all you'll spend your time here screwing as many men as I can sell you too. I have four weeks to get you in shape, and I will do it or kill you trying."
"Let's start you off with some time on a treadmill," Andy began "but first I have something just for you." From his bag Andy emptied out an assortment of vibrators, dildos, butt plugs, clamps and other sexual paraphernalia. He selected a butt plug about an inch and a half across and three inches long. He handed to her and told her to shove it up her ass. Unsure of how to proceed Mary took the offending item and tried pushing it against her ass.
"You're only going to hurt yourself if you try to shove it in dry," Andy told her, "lube it up some first"
"How Master," Mary asked with a baffled look on her face.
"I don't care," Andy said. "Suck on it or shove it up your cunt, just hurry up we're wasting time." Mary took the plug and rubbed it between her legs, gradually working at into her pussy. When it was coated she pulled it out and pressed it against her asshole. She tried pushing it in but it was just too uncomfortable.
Andy tired of watching her feeble attempts put his hand against hers and shoved it in with one push. It was shaped so that it would embed itself completely within her with just a short chain hanging behind her like a tail. Next he grabbed a dildo about six inches long and two inches in diameter, without ceremony he placed it at her slit and worked it in and out of her until he had it fully embedded in her. Andy put a leather device around Mary that looked like a chastity belt and strapped it between her legs and around her waist holding the butt plug and dildo in place.
"You will only be allowed the use this harness for the first week," Andy told her. "After that I will expect you to be able to hold the devices in place with your muscles." Mary was having difficulty moving as Andy shoved her towards the treadmill. Grabbing Mary's hands Andy lashed them to the bar at the front of the machine. He punched in some numbers and the treadmill started moving.
"You have 10 minutes to go before it stops," Andy told her. "This is a variable speed program and will speed up and slow down as well as inclining so you will feel like you're running uphill." Mary began jogging at a slow pace, feeling the offending intruders working themselves inside her body. When the treadmill started to incline it picked up speed causing her to sprint to keep from falling. For two minutes she ran at full speed. When the incline decreased and the speed lessened Mary was grateful to have a moment to try and catch her breath. As her breathing slowed the dildo and the butt plug began to vibrate. She looked at Andy and saw him fingering a small remote.
"Just a little added incentive to help keep you loose," Andy told her. As the treadmill ran through its program Andy would turn off the devices whenever Mary was sprinting and turn them back on whenever the treadmill slowed. As the treadmill finished running its program and came too a stop Mary was gasping and tears were running down her face.