Trained Step Sister the final chapter

Authors note: First, my apologies for taking so long to complete this story. Starting a new job has occupied most of my time. I also really struggled with these characters as I was trying to stretch out from what I felt comfortable with. The problem was that I discovered that I really couldn’t identify with these characters, and as a result, I wound up with some major writer’s block. Hopefully, you will find this final offering satisfactory, and if not, be able to offer some advice on where to go from here. I see writers like Ka Hamnd, and I marvel at his ability to work in so many different genres with such diverse plots and characters, and I’d like to be able to do the same.

Mark had the next couple of days off, and he tried to hook up with Julia, but she wouldn’t respond to his calls or texts.
He was a little bit worried that she might have gotten a little freaked out and was avoiding him. It didn’t make any sense, she was the one who had gone down on him without any prompting, but after his experiences with Allison, he had quit trying to figure out girls.
Allison was staying with a friend over the weekend, so Mark was stuck by himself.
On Sunday afternoon, Mark’s phone buzzed with a text from Julia.
Come over, I want to show you something.
He grinned to himself. He had a pretty good idea what she wanted to show him.
About time. He thought to himself. He headed out the door, shouting to his parents that he would be back later. As he knocked on the door Julia answered, looking dark and sinister. Her blackish-brown hair was pulled tightly back against her scalp into a severe bun that was more befitting of an octogenarian spinster than a woman who was barely twenty.
But that was as tame as it got. Her eye shadow was a thick line of black, combined with an angry red streak that emphasized the almond shape of her eyes. Her lips were covered in a vivid red shade of lipstick that stood out from her deep tan.
She was wearing a vinyl topcoat with an oval cutout that displayed her ample cleavage, and hugged tight to her figure before flaring away just above her hips to drape down to her ankles. Underneath was a black vinyl bustier that pushed her large breasts even higher, and vinyl hot pants. Finishing out her outfit were thigh high vinyl “fuck me” boots with stiletto heels, and black vinyl gloves.
Mark stood there, staring at her in her dominatrix outfit.
Holding a black riding crop in her hand, she signaled to Mark to follow her.
“I found something outside that might interest you.” She said, as Mark mutely followed her. He wasn’t sure where this was going, and he also wasn’t quite sure if he wanted to find out. He enjoyed dominating Allison, but he was damned if he wanted to be on the other end of that type of sex with Julia.
She pushed open the door to one of the rooms, and gestured inside.
Standing in the middle of the room with her back to him was Allison. Her arms were bound together at the elbows and wrists by fur-lined cuffs, and suspended directly behind her by a chain attached to the ceiling. She was clad in a pair of high heels, and nothing else. Between her ankles was a wooden rod, which was attached to her by means of two more fur-lined cuffs at her ankles. The tugging on her arms forced her to lean forward at the waist, putting her in a precarious position, held upright by her bound arms with all of her weight in front of her toes.
Her ass glowed a bright red, and her pussy was dripping down her thighs.
Mark stood there staring at her, taking in the sight of his gorgeous step-sister bound and restrained.
Julia walked up to her and began tracing the riding crop along her flesh, making Allison flinch.
“I caught her sneaking in the gate behind another resident. She’s been quite the little snoop, apparently. She refused to say anything at first, but once we got to know each other, she became quite talkative. So many interesting things she told me, such tales of debauchery, things like rape and sodomy.”
Mark kept quiet, not quite sure what to say.
Julia lifted Allison’s head up by the chin, and turned her face towards her. Allison had a silk scarf tied around her head with a folded knot in the middle of it placed in her mouth, keeping her from speaking.
Julia ran the tip of her tongue along Allison’s nose, causing her to shudder.
Mark finally was able to speak.
“What do you want?”
Julia looked up at him. “I want to play with the two of you.”
Allison whimpered and Julia brought the riding crop down on the side of her ass, causing her to jump and squeal behind her gag.
“Quiet! Mistress is speaking!”
Mark noticed the flush that came over Allison as Julia spoke, and it seemed that a little more fluid leaked from her pussy and dripped down her thighs. Allison was definitely turned on by this.
And apparently, so was Julia. Mark had assumed that if anyone knew about what had been going on between himself and Allison, they would be disgusted and repulsed.
But Julia wanted to join them? Mark had a fleeting worry that she might be just as crazy as Allison, but the idea of the two of them at his disposal was intriguing. And if he played his cards right, Julia might be able to help diffuse the situation with Allison.
Mark walked up to her and began tracing his hand along her flank. Allison was quivering, her muscles taut and straining.
“Allison, Allison, Allison.” He said, shaking his head. “Look at the mess you’ve gotten yourself into now. And all because you weren’t willing to share me with Julia.”
He paused at this and reached out for Julia, pulling her close to him, and kissing her passionately. Allison’s eyes widened and she whined behind her gag.
He turned back towards Allison. “I’d be willing to share you with whoever wanted a piece of your slutty ass.”
Julia ran her hand along Marks groin, gently stroking his cock through his pants.
“I know a place where you can share her. Guys would be lined up for a piece of her ass. Girls, too.” She added as Allison began to shiver.
Mark thought for a moment. Would she be willing to do it? Let a bunch of strangers fuck her?
Well, he could start with seeing how far she would go with Julia, if he could get Julia to cooperate. He turned to Julia and asked her.
“What do you want to play?”
She smiled seductively and knelt in front of Mark, pulling his cock out of his shorts and licking her lips theatrically while eyeing Allison.
Allison’s eyes widened and she began to whine though her gag, wiggling in her restraints.
Julia opened her mouth and began licking up and down the length of Mark’s shaft, staring into Allison’s eyes the entire time.
“My favorite game.” Julia replied. “Dominating a hot bitch.”
Allison moaned and Mark’s eyes widened slightly as a grin spread across his face.
Julia went back to work on his shaft, sucking him all the way down in a single motion.
“You see Allison? See how easily she took my cock all the way down her throat? I told you that Julia was hotter than you.”
Allison’s eyes narrowed and she exhaled sharply through her nose.
Julia pulled back off of Mark’s cock and glared at her.
“Are you disagreeing, slut!!”
Allison’s eyes got wide and she frantically shook her head no, but Julia wasn’t buying it.
“You little tramp.” She hissed at her as she stood. She walked behind her and began unlinking the cuffs from the chain. As she came free, Allison started to topple forward, but Julia yanked her back by the arms, and Allison regained her balance.
“Kneel across his lap!” Julia barked.
Mark sat down on the edge of the bed, and Allison tottered towards him on unsteady legs. As she knelt down over his lap, Julia approached with a leather paddle. Mark reached down and unclipped Allison’s wrist and elbow cuffs from each other, allowing her to move her arms freely. She put her arms down on the floor in front of her as Julia trailed the paddle across her upturned ass. Allison whimpered as Julia brought it down on her in a short smack. She began moaning as Julia continued spanking her, her ass turning a bright red.
After a couple of minutes, Julia pushed Mark onto his back and directed Allison to climb on top of him. As soon as she had sunk down on his cock, Julia smacked her ass with the paddle again, making her squeal and pop back up to escape the sting.
“Back down on his cock, slut!” Julia shouted at her.
Allison dutifully lowered herself again, only to have Julia smack her as soon as she bottomed out. She whimpered and pushed forward, trying to avoid the paddle.
Mark put his hands on her hips and pushed her back down, where she was met once again by the paddle. He kept her pinned in place while Julia kept smacking her ass. Allison whimpered through the series of smacks, wiggling her hips trying to avoid the stinging blows landing on her tender ass cheeks. Tears trickled down her cheeks while Julia continued her assault.
Allison was enraptured. She had followed Julia home on Friday night, not really sure what she was doing when Julia had caught her. Allison had tried to play dumb, but Julia had recognized her as Mark’s sister and invited her inside. Allison had tried to play it off and retreat gracefully, but Julia had been insistent and Allison couldn’t really come up with a convincing reason why she had to leave, without seeming any crazier than she already did.
As she sat on the couch drinking with her, Allison started to get the impression that Julia was hitting on her, and it made her a little nervous. She didn’t think of herself as a prude or a homophobe, she just wasn’t into girls. She felt that she had spent enough time there that she could now leave without seeming rude, but then Julia started talking about Mark. Allison sat open mouthed while Julia described her sexual encounters with Mark in graphic detail. Her mind was reeling when Julia invited her to take a look in her “fun room”.
“Fun room?” Allison asked. “Yup.” Julia replied with a glint in her eye. “Mark and I play in there all the time. Want to see how he uses me?”
Allison shook her head silently. She had no desire to know about what Mark did with this shameless whore. She stood to leave, but Julia grabbed her arm and pulled her back down on the couch.
“Oh, I think you do. I think that you want to know … Every … Last … Detail.”
She leaned close to Allison, whispering softly in her ear. “I could see it in your eyes. Your pupils dilating, your breathing getting faster, your chest getting flushed. You were turned on, hearing about the two of us.”
Allison was frozen in place. She was bigger than Julia, and pretty sure that she could physically overpower her, but she couldn’t bring herself to move. In the meantime, Julia had crawled onto her lap, straddling her and running her hands along her face, tilting her chin up to look into her eyes.
“I guess the only question is: Are you turned on at the thought of me? Or of your brother?”
“Step-brother.” Allison hoarsely whispered.
Julia’s eyes narrowed and she laughed. “So you’re horny for your step-brother. How twisted is that? Little suburban princess, dreaming of her step-brother fucking her. Do you spy on him in the shower? Do your rub yourself in bed while you think about him? How lonely do you get when you know he’s fucking me while you sit at home alone?”
Allison finally responded at that dig.
“He’s fucking me, too!!!” She shouted, and then realized what she had just done. Her eyes were round as plates, and she clamped her hands over her mouth as she turned white as a sheet.
Julia smirked at her. “Well, well, well. This IS interesting.”
Allison slumped her head, the fight having gone out of her. “Please don’t tell anyone.”
Julia stood up and took Allison by the hand, leading her down the hallway. “I won’t tell. But I want to know all the details.”
Allison followed along unresistingly, but couldn’t bring herself to share the intimate details of her sex life with Mark. “Please, I can’t.”
“Oh I think you can. You just need the proper motivation. How about knowing that in this room, I’ll teach you everything you need to know to hold on to him forever? So that you’ll never lose him to anyone else.”
Allison’s ears pricked up at that. “Really? You can do that?”
“Oh, yes honey. But you have to be prepared to experience what he’ll do to you. Do you think that you can handle that?”
“After how he’s used me already, there’s nothing I can’t handle.” She stated.
Julia’s eyes widened slightly and she smiled. “We’ll see.” And she led her inside the door.
For the next two days, Julia had her way with Allison. She had an extensive collection of sex toys, and Allison got to experience all of them. The strap-ons, the floggers, the paddles, the saw horse, the restraints, the collars, and the nipple clamps. She lost track of how many times Julia had made her cum. It seemed like a non-stop fuckfest as Julia used all of her holes. She only stopped to eat and allow Allison to use the restroom. When she slept, it was with a dildo in her pussy and a buttplug in her ass, secured by a chastity belt. She had been hesitant at first, but Julia had started with a flogger and worked her in slowly, and before she knew it, Allison was screaming for Julia to fuck her. Periodically, Julia would ask her about the different things Mark had done to her, and Allison would tell her, starting Julia on another round with another toy. At first Allison thought that she would be learning how to keep Mark’s attention, but she soon forgot about that and just concentrated on the pleasure Julia was giving her.