Trained Step Sister pt.3

Introduction:
After their parents returned, Mark and Allison wound up not having any time by themselves. Either one or both of their parents was at home at the same time they were, or one of the two of them was working. For the first few days, it was tolerable, but after about a week, it was driving the both of them nuts. Mark was still seeing Julia, but she was keeping him at arms distance on their dates. She would still make out with him, but that was it.How did this happen? Mark wondered to himself. We’re actually progressing backwards in our relationship!
It was especially torturous for him to go home and see Allison, knowing that she was so close, yet so far from him. She wasn’t helping matters by the way that she was dressing. Her shorts were cut high enough that her ass cheeks peeked out the bottom before sloping gently into the backs of her thighs, and her shirts were cut low enough to display a nice amount of her cleavage, and tight enough to accentuate her curves.
Mark found himself masturbating in the shower a couple of times while picturing Allison and replaying some of their sexual encounters in his memory.
After a couple of weeks of this torment, their parents announced that there would be a dinner party that weekend, and he knew that he and Allison would both be off work that night.Finally!! Mark thought to himself. But his hopes were immediately dashed when they announced that they were hosting it, and he and Allison were expected to be present to help serve their guests.
He and Julia had hung out the night before, and that hadn’t helped his mood any. As they kissed goodnight, she ran her hand along the crotch of his shorts, tracing the outline of his cock with her fingernails before abruptly jumping in her SUV and driving off, leaving him cursing the darkness.
As he returned home from work the next evening, his phone rang. His step mother was running late, and his dad was still at work: Could he pick up some ice?
Immediately seizing his opportunity, he asked her how late she would be, and if he needed to get anything started for her.
“Why thank you Mark, that’s so thoughtful. I’m only about half an hour late, so I don’t think so. I’ll let you know if I’ll be any later.”
Mark hung up and sped home, briefly stopping for ice. Half an hour, tops.
As he pulled into their drive, his heart leapt. Allison was home!
He raced into the house and began searching for her, finding her in the dining room, arranging place settings.
“Can you believe we have to do this shit?” She groused to him.
He ignored her complaint and spun her around so that her ass was facing him and dropped his shorts.
“Mark, what are you …”
“Your mom is running half an hour late.” He hoarsely whispered in her ear as he undid the button on her shorts and stripped them down to her ankles. Allison didn’t need to be told twice, she leaned forward and placed her hands on the table as Mark stroked his dick once or twice in his hand, and started rubbing it up and down her slit. After a couple of passes, Allison’s pussy started to get wet, and she nodded to him.
“I’m ready.”
“It wouldn’t matter if you weren’t.” He snarled at her as he pushed into her moistening twat. Allison smiled at that. He didn’t need to force her to do this and they both knew it, but she enjoyed the charade nonetheless.
He pumped in and out of her in several shallow strokes, loosening her up before ramming in several times, getting as deep as he could, and making her gasp and whimper. He grabbed her by the hair and yanked her head back, snarling in her ear as he fucked her.
“Take it, take it, take it, that’s right, take my cock you little whore.”
Allison moaned in pleasure, feeling the pressure build up in her loins, ready to be released. Suddenly, Mark withdrew from her and began scrambling for his shorts.
“Shit! I just heard a car!! Get dressed, I think your mom is home!!”
Allison dutifully pulled her shorts back up and straightened the tablecloth that she had wrinkled, before heading towards her bathroom and jumping in the shower, just as her mother walked in the door.
When she came out, she found her mother and step father frantically scurrying about.
“Why were both of you in the shower at the same time? There’s work that needs to be done!” Her mom bitched at her. She glanced at the clock and swore under her breath. “We won’t be ready when they get here.” Her husband placed a hand on her shoulder and gave it a light squeeze.
“Everything will be fine, you’ll see.”
With the four of them working, they managed to get everything set up with time to spare, and their parents heaved a sigh of relief.
“Okay, we’re going to go get ready, you two be dressed when they get here. Mark, no shorts, khakis and a button down shirt.”
Mark rolled his eyes, but agreed. As soon as their parents disappeared, Allison turned to Mark.
“I’m all sweaty again, I’m going to take another shower before people get here.” And she headed towards her bathroom.
As she stood under the showerhead, she lightly rubbed her pussy lips, and pushed them together on top of her clit, giving herself a light buzz as she gently rubbed them up and down, her clit trapped between them.
God, she had been so close when Mark had stopped …
She was awakened from her reverie by the shower curtain being whisked back, and Mark stepping into the shower with her.
“What do you think you’re doing?” She asked him as she smiled coyly.
“Finishing what I started.” He replied as he bent her over at the waist, presenting her pussy at just the right angle to him. Allison wasn’t the only one who had been deprived of their orgasm earlier, Mark had also been close when her mother had returned home, interrupting the two of them.
He took a deep breath and slid his cock into Allison, making them both moan. He leaned forward and whispered in her ear.
“Allison, you have to be quiet, understand?” She nodded her head as he began pumping his cock in and out of her boiling pussy.Jesus, how did I go so long without him? Allison thought to herself.Jesus, how did I go so long without having sex? Mark thought to himself.
He quickly built up a steady rhythm, his dick twitching inside of her. He reached forward and cupped her swaying breasts in his hands, pinching her erect nipples between his fingers. He could feel her pussy convulsing around his dick, she was so hot that he was convinced that his dick was going to be scalded.
He felt his balls aching for release when he suddenly heard his step-mother’s voice getting closer.
“Allison? Allison?”
Mark froze as her mom knocked on the door.
“Allison, have you seen Mark?”
Mark choked and stuffed a washcloth in his mouth and bit down on it as hard as he could.
“Allison, did you hear me?”
Allison fought to control her voice as she answered her mother, shouting forcefully to cover her passion.
“Jeez mom, I’m in the shower!”
“Don’t take that tone with me, young lady, I asked if you had seen Mark.”
Allison leaned her head against her arm and bit down on the flesh, stifling a huge groan as she did so.
“Allison?”
“No, I haven’t. He’s probably in his room.”
“I just came from there.”
“Maybe he’s out back; I think he said something about that.” Allison squeezed her eyes shut; she was having a hard time concentrating. She had continued rocking back and forth the entire time, fucking herself on Mark’s cock. He was clenching every muscle in his body, fighting to stay in control, but it was no use. He began cumming into Allison, biting down hard on the washcloth to silence his cries.
“Okay, well hurry up; our guests will be here soon.”
As soon as she walked away, Mark and Allison both let huge gasps of relief. She turned to look at him and stifled a laugh.
“God that was so hot.”Hot? HOT??? Mark thought he was going to have heart attack when she had come to the door. He took a deep breath to calm himself.
“You go out first and make sure the coast is clear.”
“Why me?” Allison asked petulantly.
He gave her a look. “Allison, how is it going to look, me coming out of your shower, after your mom already knows that you were in here?”
Allison pouted as she looked up at him and ran her hand down his chest. “I didn’t get to cum. That’s twice now. I hate her.”
Mark took her hand off of his chest. “Jesus Christ Allison, not now.” His heart was still racing. If her mom had caught them together in here …
Allison finally relented and went to check that the coast was clear. Mark raced down the hall to his room, and took a deep breath.Jesus, that was too close for comfort. He thought to himself. He forced himself to slow his breathing and hopped in his shower for a quick rinse, then dressed and headed out to the kitchen.
“Mark, where have you been?” His step-mom asked. “I need you to move some of the chairs around the table outside.”
As Mark headed towards the back door, Allison walked out in a tight fitting low cut maxi dress that reached her ankles. As she walked past him she whispered in his ear, “I’m not wearing any panties.” with a gleam in her eye.
Mark took a deep breath and fought to control himself. He knew that tonight was going to be difficult: Allison was horny, and he wasn’t sure how far she would push him. His biggest concern was that with a crowd of people, someone may see the two of them doing something inappropriate.
As their guests began arriving, Mark and Allison chatted pleasantly with them, answering questions about their future plans, when one of them asked Allison about her college choice. Her mother looked a little disappointed.
“She’s been considering several out of state universities. My baby is leaving the nest.”
“Actually, I’ve decided to go to State.” Allison replied.
Her mother looked pleased. “With Mark? And it’s so much closer to home!”
She turned to Mark. “Didn’t you say that your roommate had backed out on you Mark? Now Allison can take his place, it would be cheaper then staying in the dorms.”
Mark had a surprised look on his face, and eventually stammered “Umm, yeah, but a female roommate …?”
“Oh, that’s no big deal. You’ll be off campus, and it’s a two bedroom apartment, it won’t be much different than being here at home.”
Their parents beamed as they turned to Allison. “What an excellent idea! Then Mark could keep an eye on you and keep you out of trouble.”
“That’s what I’m counting on.” Allison said with a wink as she grinned at Mark.
Mark sat there, completely caught off guard as the conversation swirled on around him.Holy shit, now what do I do?
The rest of the evening, he managed to avoid being alone with her, but he noticed the little sidelong glances she kept making at him, and they were making him uncomfortable: he was sure that someone was going to be able to sense that something was going on between the two of them.
The wine had been flowing liberally throughout dinner, and as the evening wore on the adults began getting a little silly, and he found himself getting a little bored. He wandered outside to find Allison alone, sprawled out in a patio chair.
She smiled up at him. “Coming to find me?” She reached down to the hem of her dress and began to pull it up past her knees.
“Allison, stop.” Mark stepped closer to her to try and cover her movement, and she grinned as she exposed her pussy to him, bunching the material of her dress up above her waist.
“Just think, you’ll be seeing this every night next year in college. I can’t wait until we’re alone there.”
“Allison, this is crazy.” Mark said, frantically trying to pull the hem of her dress down, but Allison giggled as she wrested with him over the material.
“Allison …” Mark warned in a stern tone. “Stop it; you’re acting like a brat.”
She smiled up at him with a devious gleam in her eye.
“Make me.” She taunted.
“Allison, this is really stupid, someone can just walk out here and see what you’re doing. And where do you think this is going? I told you, we can’t date, we can’t be in a relationship, it’s just crazy.”
“We already are in a relationship.” Allison said as she reached for the zipper on his pants. “We’re in a relationship where you fuck me. What else do we need?”
Mark grabbed Allison’s hands and held them in place. “Just so long as you understand that’s all that there is.”
She looked up at him and rolled her eyes. “Jesus Christ Mark, I’m not stupid. I know exactly what this is. Now you’ve fucked me twice tonight, but I still haven’t cum yet. Why else do you think I’m so horny right now?”
Mark glanced back over his shoulder, and then took a look around their back yard.
“Not out here, we need some more privacy.” He took her by the hand and led her back towards the far end of the pool, away from the light spilling out from the windows of the house. There were several pool chairs there, and Allison chose one that faced the house, so they could see if anyone came looking for them.
Allison bent over and placed her hands on the lounge, while Mark pulled her dress up above her hips and unzipped his pants. He ran his fingers up and down her pussy lips until she started to get wet, and then placed his cock at the entrance to her pussy. He pushed into her for the third time that night, eliciting a loud sigh of satisfaction from her.
He leaned forward and whispered urgently in her ear. “Not so much noise!!”
She groaned again and nodded as he continued pushing in and out of her. Her pussy was boiling; Mark couldn’t believe how hot she was.
“Do me hard Mark, treat me like a whore.” She moaned at him.
Mark couldn’t figure out where this was coming from. Allison had always been a princess, a spoiled brat, wanting for nothing. But somehow, having him take total control over her and forcing himself on her got her hot.
He bunched up the material from her dress in his hand, and placed it above her hip, keeping it out of his way. He grabbed her by the hair with his other hand and began forcing her backwards and forwards, while continuing to buck his hips into her. Allison loved the feeling and began moaning, but Mark realized that the rhythmic slapping sound of his groin smacking against her firm buttocks didn’t leave much doubt as to what was going on, especially with Allison’s moans of passion.
“Allison, be quiet!” He commanded.
Allison smiled and purred. He had grabbed her hair right at the base of her skull where it gave her a feeling of submission, but didn’t hurt too badly, just enough to excite her.
She decided to have some fun with this; it wasn’t fair that she hadn’t cum yet. She started bending her knees, one after the other, to rock her hips back and forth. She kept mewling as Mark continued to slam into her.
Mark let go of her dress and placed his hand over her mouth to silence her. Now he had both hands wrapped around her head, adding to the eroticism of the encounter for Allison. He pulled her upright, and she bunched up the material of her dress, hiking it up above her waist, while Mark maintained his grip on her head and continued pumping in and out of her.
From this position he was hitting her g-spot on every stroke, sending little jolts of electricity through her groin. Allison could feel her impending orgasm about to overwhelm her when Mark suddenly stopped and began crab walking them behind a bush.
“Someone’s coming!” He hissed in her ear. Allison tried to keep moving with him, but her legs were feeling weak, and she stumbled in her wedge sandals. Mark wrapped his arm around her waist, and physically lifted her off the ground as he scurried for cover. His dick had been dislodged in the process, and Allison whined a complaint into the hand still covering her mouth.
“Mark? Where are you?” His dad called, peering into the darkness. “People are leaving now, come say goodbye.”
“Okay.” Mark called back, evoking a muffled exhalation of indignation from Allison.Again?!?!? She thought to herself. Jesus Christ, what’s a girl got to do to have an orgasm around here????
“Is Allison with you?” His dad asked.
“Yeah, we’re talking about next year.” Mark replied.
“Well the two of you come say your goodbyes.” He said, and walked back inside.
Mark took his hand off of Allison’s mouth and breathed a sigh of relief. He pushed Allison down towards his cock and pressed it against her lips.
“Clean it off real quick.” He instructed her.
She was about to protest when he grabbed her by the chin and pressed on both of her cheeks, forcing her mouth open and shoving his dick into it. He rocked back and forth a few times, then tucked it back into his pants and headed inside. Allison sat there for a moment collecting herself, then stood up, straightened her dress, and followed him inside.
As they bade their parents’ guests good night, her mom peered quizzically at her.
“Allison, are you okay? You look a little flushed.”
Mark panicked for a brief moment, but Allison calmly defused the situation.
“I had a couple of glasses of wine tonight; I’m feeling a little warm.” She said.
As they set about cleaning up, Allison could barely contain herself. She had been just about to cum when they were interrupted this time, and she fought the urge to leap on Mark and fuck him to her hearts content.
Their parents bade them good night and headed to bed. As soon as their bedroom door closed, Allison was reaching for Mark’s pants, but he pushed her hands away.
“Are you nuts? We’ve had them almost walk in on us twice tonight. No way.”
Allison was going crazy with desire. “Maaarrrrrrrkkkkk, I have to cum, please make me cum.”
“No way, not with them in the house. You’re going to have to take care of things yourself.” He said, to Allison’s disbelief.
Mark headed to his bedroom, leaving Allison horny and frustrated. She waited until she was pretty sure that their parents were asleep, and then tried to sneak into Marks room, only to discover that he had locked the door. She stamped her feet in frustration before going to her room. She climbed into her shower and turned the water on before selecting the pulse setting. Thank God she had a handheld shower head …
She snatched it off the wall and pressed it to her pussy while she twisted her nipples.Oh God, yes…
She leaned back against the shower wall as she felt herself finally getting close again.
Her orgasm was a small one, but she would take it after what she had gone through tonight.
Three times. Three times Mark had been inside of her tonight, and she hadn’t been able to cum once. She closed her eyes and sighed. This would have to do for now. Tomorrow, she’d find a way to be alone with Mark.
The next day, Allison couldn’t stop looking at the clock; she thought her shift at the store would never end. As soon as she finished, she headed to the water park, figuring to catch Mark as he was leaving. Unfortunately, rush hour traffic impeded her, and she got there half an hour after the park closed that night. The parking lot was deserted, except for Mark’s car.
Where was he? She grabbed her phone and texted him, but got no response. She called and it immediately went to voicemail.
Her heart sank. He’s with that whore…
Mark ignored his phone; he didn’t want to think about Allison right now. He and Julia had gone to a nearby burger joint and were just enjoying each other’s company. Fucking Allison the previous night had really relaxed him, and as odd as it seemed, now that Mark didn’t care about getting in her pants tonight, Julia seemed to be warming up to him.
She was constantly reaching across the table and touching him, and at one point, when a girl had cast a glance his direction, Julia had glared at her.
Mark grinned to himself. He didn’t know what kind of game Julia was playing, but he was going to play it cool with her, and having gotten laid the night before helped him carry it off. The more laid back he was, the more Julia seemed to be trying to arouse him.
As she pulled up next to his car, Julia turned to him with a smile as she shut off the engine.
“I really enjoy spending time with you.”
“Thanks.” Mark replied. “I enjoy spending time with you, too.”
As they kissed goodnight, Mark thought he could detect some reluctance on Julia’s part to let him go, but he wasn’t sure.
As Mark returned home that night, Allison was waiting for him in the driveway.
“Why didn’t you answer your phone?” She demanded of him angrily.
He sighed and pushed past her. “I’m too tired for this shit.”
“Mark, wait!!” She grabbed at his arm, trying to stop him. “Please, I need you!”
He pulled free of her clutching grasp, exasperated with her neediness. God, I wish I had never fucked her. She’s driving me crazy!
“Allison, knock it off, our parents are inside. Do you want them to find out what we’ve been doing?”
“You mean, ‘what you’ve been doing to me’?”
Mark stopped in his tracks. Something about the way she said that made the hairs on the back of his neck stand up. He turned to face her as she crossed her arms over her chest and appraised him coolly.
“Allison …” He began. He couldn’t even think of what to say next. “What are you saying?”
“I’m saying that you better be figuring out how to keep me happy instead of spending time with that whore, if you know what’s good for you.”
Mark could see the veiled threat that was there, and he started to respond when it hit him: she was trying to piss him off, to get under his skin.God, this is getting tiring. He thought to himself. The endless mind games were wearing on him, and Allison was starting to prove to be more trouble than she was worth.
But she sure looked good. She was wearing a pair of tight running shorts and a spaghetti strap tank top that displayed her assets to their best effect. Despite himself, he was getting aroused.
He glared at Allison.
“Don’t you try and threaten me you little tramp. Not after you’ve been parading around in that little slut outfit, just begging for some guy to squeeze your titties and fuck the shit out of you.”
She smiled as he stalked towards her and took her by the arm, roughly leading her around to the side of the garage, as far away from where he thought their parents might be. He glanced around the neighborhood, making sure that no one would see them as he dragged her deeper into the shadows. He pushed her up against the rough brick wall a little more forcefully than necessary, and then slapped her across the face. He was pissed at her, at himself, at this whole situation. He yanked her shorts down and was greeted by the musky aroma of her wet pussy. He pushed her shorts down to her feet and bent to pull them over her sandals before straightening back up and jamming them into her mouth as she moaned appreciatively. Her pungent juices filled her mouth as she bit down on the nylon shorts.
Mark dropped his shorts and ran his swelling dick up and down her pubis, lightly touching her swollen clit as he did so. Allison had begun growing her pubic hair back, and he could feel the short hairs tickling the underside of his shaft. He dropped his hand to her pussy and began roughly fingering her as she moaned into her shorts. He pulled his hand free and hiked her leg up to provide himself with a passage into her wet tunnel and guided his shaft into her as she wrapped her arms around his neck, humping her hips wildly, desperately seeking a release. He grabbed her ass with his free hand and pulled her towards his cock. She grabbed his shaft with her hand and guided him to her opening. She groaned as he sank into her, pushing as deeply as he could. She squirmed a bit, trying to accommodate his girth, but he gave her no time to adjust, pushing into her as deeply as he could, mashing up against her clit on each stroke. She bit down into the shorts he had stuffed into her mouth and pulled herself as closely to him as she could, enjoying the forceful fucking she was getting from him.
For his part, Mark was feeling more and more like this was a chore. Who would have thought that sex could be such a hassle?
He glanced down at Allison and felt a surge of anger towards her. Her eyes were squeezed shut and she was breathing heavily as her teeth clenched down on the shorts stuffed into her mouth. He could feel how hot she was, her pussy was clamping down on his cock, and her juices were running down her legs. She was enjoying herself, and he wasn’t, and that pissed Mark off.
He took his hand off her ass and placed it against her throat, cutting off her air. She began inhaling sharply through her nose, and Mark could feel her struggle a bit. His hand was in an awkward position, so it wasn’t like he was really choking her, but his thumb was pushing against her windpipe, giving her the feeling of choking. It panicked her a bit at first, but it also made her feel a bit light headed, which made the sensations in her groin even more intense. Mark began thrusting into her as hard as he could, lifting her off the ground with each thrust, making her squeal. Mark leaned forward, pressing her against the wall while he slammed into her, trying to batter her pussy into submission.
Despite his annoyance with her he couldn’t fight nature, and it wasn’t long before Allison’s grasping pussy had him ready to cum.
He started grunting, and his thumb pressed even harder against her windpipe. That pushed Allison over the edge, and she began cumming hard, moaning past her shorts. She pulled her arms even tighter around Mark’s neck, and he came, shooting his load into her pussy.
He released his hold on her neck as his breathing returned to normal, and let her leg fall to the ground. Allison was still shaky, and kept her arms wrapped around his neck to hold herself up. Mark gently retrieved her shorts from her mouth and kept them in his hand until she let go of him, then pressed them into her hand.
“I’m going inside. You need to stay out here and get yourself together.”
As he walked off, Allison leaned back against the wall and exhaled, wiping sweat from her forehead and smiling.He’s so easy … She thought to herself.
For his part, Mark was confused by her behavior and a bit worried too. After last night, he thought that Allison knew where things stood, but he hadn’t counted on her jealousy complicating things.
As he lay in bed that night he tossed and turned, consumed with worry. As bratty as she was, Allison may very well try and claim that he had been raping her all summer. He knew that he was going to have to find a way to defuse the threat she was holding over his head.

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