Chapter 10
There was a moment that Mark thought he’d fucked it up. The bra was too much. He’d moved too fast. Everything depended on his ability to push Liz toward an idea without making her trip over her doubts.
The look on Liz’s face was confused, suspicious… her eyes were stuck on the bra in his hand and the front of his shorts. Mark could see the wheels in her head grinding.
“C’mere,” he said, pulling his right hand from his shorts and patting the bed next to him. On the screen, the actress was talking to her mother through a barely-open door while the actor, “hidden”, was stuffing his fingers in her pussy to try to mess with her.
Obedience won out over her doubt, and Liz climbed on the bed. “Mark,” she said, but the silence that followed told him she didn’t have the words to express her thoughts. So Mark gave her new ones.
“Isn’t it hot?” he said, nodding toward the screen. “Forbidden acts, almost getting caught and doing it anyway… the thrill, y’know?”
“Yeah,” Liz agreed, settling in and cuddling against him. She was like a puppy who needed to be reminded it was loved. Mark patted her head, and she leaned into the touch.
“Liz, I wanna ask you something.” Mark looked down a little, feigning shyness. “Would you play at being forbidden?”
“Forbidden?” she asked, cocking her head to the side curiously. On the screen, the girl was pretending that her “brother” wasn’t standing behind her fucking her. It wasn’t very convincing since she was bouncing back and forth and her tits were pretty visible swinging in and out of view from the mother’s side of the door.
Mark nodded, setting Amy’s bra down and reaching over to take Liz’s hand. “I just think, for our first time together… I want it to feel more special, you know? Right now, it’s like ‘Mark and Liz, of course they’re doing it, they’re college kids in love’. But I thought, maybe you could pretend.”
“Pretend?”
“Pretend like it’s not allowed.” Mark shifted to look in her eyes, brushing her hair back lovingly. “Pretend like it’s forbidden, like we have to hide but we’re just so in love that we can’t stop.”
Liz smiled when he said the ‘L’ word. She couldn’t not, it seemed. “Okay, she said, nodding. “It sounds… fun.”
Mark grinned. He handed her the bra that Amy had left behind. “I know it won’t fit, but here.”
Liz looked doubtful, but took it from him. She let the top of the towel drop, exposing her tits and tight stomach, then pulled the bra on and clasped it shut. “How do I look?”
“Like the apple of Eden,” Mark said with a wink. Liz had been raised really religious, which was probably a big part of why she was so desperate for male approval all the time. The truth was that the bra looked a little silly. It hung loose from her, and Mark could see her nipples not even touching the fabric. But it didn’t matter. When he looked at it, he remembered Amy. How she’d looked wearing it… how she’d looked with it off… how she’d looked when he’d plastered her big, soft tits with his cum. His cock throbbed like a hot iron. “Be a little reluctant, ‘sis’, okay?”
Liz nodded again. “O-okay.” Not that it would be tough for her to act that way, with her brain apparently in some sort of confused paradox-lock, but Mark knew she’d wanted him to fuck her so badly… making her sing for her supper would be easiest right now when she was so excited about finally getting what she wanted most.
Leaning in, Mark cupped Liz’s cheek and kissed her, putting some urgency into it. Her lips parted immediately and she moaned. “Resist a little,” he whispered, and she stopped and became a little less obviously eager.
“Mark, I… I dunno about this,” she whispered between his eager kisses. “Maybe we should t-talk about-”
“Shoosh,” Mark said, putting a finger to her lips. His other hand moved to her thigh, sliding up under the pooled towel in her lap. “Let big brother take care of you.”
Liz gasped as Mark slid two fingers into her. It wasn’t difficult; despite the tight grip, she was soaked with excitement. He pumped them in and out slowly, leaning in to kiss her neck. She smells nice, he thought, moving his free hand under the ridiculously oversized bra to cup and squeeze her breast, but not quite right. He made a mental note to buy her some of Amy’s brand of shampoos and soaps.
“Isn’t that better?” Mark asked, leaning in to softly bite her ear. “Nobody’s gonna find out. It’s just you and me.”
Liz moaned again, squirming a little in his grip. She didn’t give in entirely, and the movement reminded him a lot of how his sister had tried to resist him. Except that he knew with Liz he could go ahead and do something about it.
With a bit of a growl, Mark shoved her down on her back, yanking the towel away and laying her bare on the bed. “I can’t take it anymore,” he said, staring into her eyes but thinking only of Amy’s. The way she had looked up at him with that mischief in her gaze as she jerked him off between her tits. “I have to have you, whether you’re ready or not.”
“Yes- I-I meant no,” Liz said, moving her hands to push up on his chest. “We- we can’t, Mark… right?”
“Right.” Mark frowned, looking down at her. It was so hard to ignore her skinny body when he’d seen Amy’s amazing curves, her stereotypically blonde hair, her little tits under where Amy’s bra had shifted up as she’d gone down. “But it doesn’t matter now, A- uh, angel. You’re mine.”
Liz squirmed as Mark reached for her hips. He was straddling her thighs, and he could feel her trying to spread her legs, but he needed something else. Grasping her tightly, he flipped her over on her front and pulled so her knees slipped under her. With her face down and her ass up, the perspective was better for his imagination.
Liz’s cunt glistened, ready to be taken. That wasn’t a word Mark used often to think of it, but in this case, it fit. Liz was his fake-sister whore, and her cunt was ready to receive his virgin cock.
He shifted to press the tip between her lips, hands shaking a little as he lined himself up. “After this you won’t need to resist anymore,” he promised her. “You’ll be mine and you can stop convincing yourself otherwise.”
Liz tried to lift her front off the bed, tried to say something, but Mark denied her. He put a hand between her shoulder blades, pushing her down, then grabbed her hips again and shoved.
There was pain at first. The angle was wrong, Liz was clenched tight, and Mark’s entry was briefly denied, almost making him bend himself. But force won out, and Liz’s resistance collapsed inward. Mark groaned as tight heat of her wrapped around him for the first time ever.
Liz cried out in shock and pleasure. Her legs quivered, almost gave out, but Mark held her fast. Lifted up like this, her athletic little ass looked more like the big soft curves he was imagining. Looking down, he was amazed to see that there was still another inch left, and he pulled her back to correct it.
Mark closed his eyes for a moment. He thought about how Amy would look, how she’d sound, when he finally convinced her to let him have her. He almost felt a little guilt at not saving himself for her, a little throb from that initial painful thrust reminded him that she deserved better. She deserved Mark with some practice, a little skill. She deserved gentle, loving treatment. And for that to happen, Mark had to get this out of his system.
Liz was rallying, trying to lift herself up again. That couldn’t be allowed. Mark drew back a little, shuddering at the pleasure of her pussy squeezing and pulling at him, then slammed forward hard again. Liz cried out in response, gripping the bed instead.
It was amazing, really. Even if he hadn’t been superimposing a picture of his sister over Liz’s body in his mind, her plump ass held up in the air for his pleasure, the heat and the feel of her was just intense, better than any blowjob had ever been. Mark stroked down Liz’s back. “Good girl. Mom won’t know. Nobody will, because it’s just you and me and they don’t matter.” He glanced over at the video that was still playing, watching the couple on the screen writhing and humping like animals. “Just relax.”
Liz exhaled, relaxing in Mark’s grip, although inside she was still tensely gripping at him. Mark started pumping his hips out and in. It was good that he’d already gotten off twice today, because otherwise he wouldn’t have been able to last… and he wanted this to last.
Once he’d found the angle and rhythm that let him glide in and out of Liz’s hole, Mark gripped her hips tighter and started going faster. He didn’t want to make love to Liz. He wanted to fuck her. To use her in place of his sister to get out all the frustration and denial of the long weeks of scheming and teasing.
The sound of his hips spanking Liz’s ass started to drown out the porn on the screen. Liz was moaning into a pillow she’d pulled under herself. Mark spread her little ass and pounded in harder, taking her to his base over and over again, punishing her.
Punishing May.
She was a bad girl, she’d made him wait so long. She’d resisted so much and all he wanted was to do what was best for her. To get her away from the stupid guys she liked before Greg or some other mouth-breathing douchebag claimed her. She needed that self-destructive desire fucked out of her so she could be with someone who really loved her.
Someone who was in love with her.
Mark slowed down a little, still pushing hard and deep into Liz’s little body but being less rough with her. He was in love? This had been about using Amy, about turning her into an obedient toy for when he needed her. But somehow, she’d gotten in his head. And now, grinding into his girlfriend, pulling back and pushing deep to make her tunnel stroke every last inch of him, he was suddenly filled with desire for more than just fucking.
Physical pleasure, emotional desire, lustful sounds. The three formed an alchemy in Mark’s mind, He sped up again, thrusting into Liz in a hammering pace, but more smoothly, no longer trying to punish her or vent frustration. There was only need now, need and want and flesh and destiny.
With a choked grunt, Mark started to cum inside of Liz. He wondered if he should have pulled out, then banished the thought. This was special, and it felt too good to stop. He pushed deep and ground into her, holding her hips against himself while he throbbed and spurted within her.
And then it was gone, and he was himself again, hilted within his girlfriend’s slender body, panting for breath with his heart beating in his ears. He let out a breathless chuckle and reached down to stroke Liz’s back.
Liz leaned to the side a little. Mark let her turn enough to look back and up at him, but didn’t let her hips move away. Even the little movement made him shudder with aftershocks.
“Hi,” Mark said, smiling down at her.
“H-hey,” Liz replied, swallowing. Her makeup was smeared on her face and the pillowcase in equal measure, washed off by sweat and excitement. “Was that… what you wanted?”
“It was perfect, baby,” Mark said, nodding. “You were right to want to do it.”
Liz beamed happily. “I’m glad. I wanted it so much.”
“I know.”
There was a long pause, then Liz swallowed again. “Can you-”
“Oh yeah. Sure.” Mark pulled back, shuddering at the teasing sensation of disengaging from her.
Liz lifted herself up shakily and turned round to kiss him. Mark kissed her back and stroked her sides, then let her go, watching as she got off the bed. He was pretty sure he could see his cum dripping down her thigh as she went into the bathroom to clean up.
—***—
Liz spent the night in Mark’s bed. She gave hints that she wanted to go a couple more rounds with him, but Mark convinced her to settle for less strenuous cuddling and resting. In the morning, she had a shower, then hurried out so she could go home and get fresh clothes for the day. After she’d departed, Amy stepped in without knocking.
“Was that a walk of shame I just witnessed?” she asked, walking over to the bed and sitting with her legs across Mark’s lap. They’d learned it was a comfortable way for her to sit “in” his lap without her less-than-waifish frame making them both uncomfortable. She was wearing a tee and cutoff denim shorts, and the heat from her legs was making his skin tingle, since he was clad only in a pair of boxers.
Mark wrapped his arms around his sister and kissed her. She smelled amazing, that unique scent he’d been missing last night. “It mighta been,” he admitted sheepishly. “I know, you want me to break it off, but-”
“It’s alright,” Amy said, cutting him off. “It was her birthday present. I know she probably climbed all over you. I’m not the jealous type, I promise.”
Mark raised a brow. Granted, his sister had been visibly very happy since he’d convinced her of their arrangement, but this was a little much. He’d expected her to be a little hurt, but had decided to tell her the truth regardless. It was the only way to build the relationship that he wanted.
Amy chuckled. “You look surprised. Or gassy. Warn me if it’s gassy.”
Mark shrugged. “I dunno, I guess I just… you’re not upset?”
“Nope.”
“Mind if I ask why?”
Amy rested her head on Mark’s chest. “Well I mean I was upset before, thinking about it. I was thinking a lot last night, after you left.”
“Thinking?”
“Yeah. About you, and us, and Liz… about the concert and the time after. I mean, if you’d have wound up alone last night you’d probably have called.”
“Yeah, I guess.” Mark squeezed Amy closer against himself.
“I thought a lot… about how you want what you want and how I’m not ready that.”
“Ah.”
“Yeah.” Amy sighed. “I was thinking, it’s not fair of me to pull you away for myself when you’ve been looking forward to this. And Liz, she’s been trying so hard to be the best for you. I thought, it’s not fair of me to stop that. So I’m not upset about anything you did with her.” She was silent for a moment, then continued. “Or anything you want to do with her, for now.”
“Seriously?”
“It’s my guilt-ridden secret birthday gift for her. She can have you until you find the right time to break it off without hurting her.”
“Wow. That’s-”
“Yeah, yeah, shut up. I’m just kicking the can down the road on my own shit, okay?” She leaned back, and her face was again cheerful and relaxed. “Now tell me all about it.”
“All?” Mark asked, feeling apprehensive.
“Of course! I wanna know what happened.” Her legs shifted and her hand came down to rest in his lap, directly on top of a rising tent in his shorts. “You’re still my stupid brother, I gotta make sure she treated you right.”
Mark smirked. “Well, we were right up front at the concert, and she was rubbing on me like she wanted to get arrested.”
“Which you enjoyed, of course,” Amy quipped, starting to rub his shaft through his boxers a little.
“Well yeah.” He slid a hand down to grab his sister’s ass. “It wasn’t like yours or anything but she knows how to use it. Anyway, the music was terrible but she loved it, and then we came back here…”
Mark described the events of the night before. Amy exposed and then stroked his cock as he talked, seemingly just to keep her hand busy for all the attention she appeared to be paying to it. She was mostly silent, but the way she chewed her lip and a shiver in her hand as he described Liz on her knees taking him into her throat told Mark Amy was enjoying the story more than she let on.
“Anyway she went to get cleaned up a little, and I put some porn on to get charged up for round two.”
“As one does.”
“Right. And she comes out in nothing but the towel, and-” Mark stopped, considering the details he would need to change. “Um, and then we started making out,” he continued, leaving out the parts about the incest porn and Amy’s bra. “There mighta been a little roleplay.”
“Oh really?” Amy said, quirking a brow. “Did ‘Daddy’ find himself a new girl?”
“Of course not, kitten,” Mark replied, smirking at the way the pet name and the dominant tone of his voice made Amy’s breath catch in her throat. “But she was pretending not to want it. Or… pretending to pretend she didn’t want it.”
“Reluctant.” And stop turning off my brain.”
Mark pulled back the hand he realized he’d been stroking Amy’s hair with. “Heh. Sorry. Yeah, reluctant. And I just sorta…let loose on her.”
“Let loose?”
“Yeah.”
“That explains the little hitch in her step, you probably bruised her hip.” Amy shrugged, stroking Mark’s cock a little faster. “I bet she loved it.”
“Mn… wanna find out first-hand?”
“Someday, maybe. Don’t push your luck.” She leaned in and kissed his neck. “Right now I just wanna be the person who most recently made you cum.”
“AHA! So you ARE jealous.”
“I could always just stop, you know. Leave you like this, all hard and with Liz not around to take care of it.”
“You wouldn’t dare, we have class soon!”
“I would, and it’s Saturday so no we don’t.” She chuckled, taking his hand and sliding it up the front of her shirt to let him grab her left breast. “Liz’ll probably be back soon, though. Might wanna hurry.”
“Oh fuck, Amy…”
“Worried? You can do it. I believe in you.”
Mark grasped his sister’s flesh like a lifeline. He hadn’t even noticed that she wasn’t wearing a bra until now, and the thought of her intentionally leaving it off aroused him even more.
As if reading his mind, Amy pulled up her shirt to expose herself. Mark groaned. Her arm pumping him was making her tits bounce… just like how they’d bounce if he was inside her, thrusting…
Suddenly Amy turned over on the couch, with her back up and her elbow on the mattress. Her mouth came down around the shaft of Mark’s cock just as he started to cum, and she kept stroking, sucking, taking every drop into her warm mouth.
Mark’s hips spasmed sharply and he moaned, leaning back to watch her take his load. When he was done, she lifted off of him again, wiping a bit of drool from the corner of her mouth with her thumb.
“Feel better?” she asked. There was nothing in her mouth; she’d swallowed it all.
“Fuck, not really, now I want you more,” Mark replied with a grin, moving his hand out of the way so she could pull her shirt back down.
“Too bad,” Amy teased. She moved to lay on her back across the bed. “You should get cleaned up. I didn’t lock the door.”
“Holy shit Ames, you’re crazy!” Mark said, pulling his boxers back into place and getting up onto legs that were shakier than he’d expected. He headed back toward the bathroom to turn on the shower. “You should probably go too, huh?”
“Nah. I’ll stick around. It’ll be fun.”
“You’re killing me! Were you like this with douche-bro?”
“Greg? Nah, he didn’t like fun.”
Mark poked his head out the door. “Join me?”
“Maybe next time,” she suggested, nodding toward the door. “I hear footsteps. Don’t worry, the whole damn room smells like sex.”
Source: reddit.com/r/sexystories/comments/e9atrj/mf_inc_markamy_chapter_10
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