*Sorry for the delays! Life, you know. Here’s a chapter I’ve been writing and rewriting in my head for a while. No mobile this time, shouldn’t be so shamefully full of errors.*
#Chapter 4
A whole day had passed. Mark was sitting at his desk and thinking about texting Amy when there was a knock on his door.
“Cover up!” Amy demanded, opening the door and stepping inside. She was wearing a plain shirt and jeans, apparently still trying to look unsexy.
“Jeez! At least give me a second!” Mark complained, swiveling his chair toward her. “What if I’d been-“
“At this point, I think you’d have enjoyed that,” Amy replied, cutting him off. She tossed a flash drive on his lap. “Here.”
Mark picked up the little device and looked at it intently, as if he could somehow read its contents. “What’s this?”
“It’s a whole bunch of porn. All of it features girls who look like Liz. You’re gonna watch it, and you’re gonna think about her. What you’re *not* gonna do is use your…” Amy waved her hands around. “Your *shenanigans* to push all my buttons and turn off my brain. I’m not a meek little idiot, and you know it.”
Shit, Mark thought. Pushed her too hard. Amy always got stubborn and dug in her heels when she realized she was losing control of a situation. “What if I don’t want to watch it?”
Amy rolled her eyes. “You want to watch it. And I’m going to make sure you do.” She sat on the bed and glared at him, laying her backpack on the floor in front of her.
“You want to watch porn together?”
“I want to make sure you watch this particular porn. Don’t make it weird.”
“Alright, fine.” Mark plugged the drive into his computer and moved to sit beside her on the bed, bringing his wireless mouse along. Amy smelled like she’d had a shower before coming over. She was fresh and clean and beautiful. “There’s a lot on here. Which one am I supposed to watch?”
“Doesn’t matter. Pick whatever.”
Mark found a file with a promising name and opened it up. The video showed a cheerleader making out with someone who was supposedly her boyfriend. The girl did indeed look a lot like Liz: tall, blonde, conventionally pretty. Probably dumb as a post, Mark thought as the boyfriend moved a hand up her skirt. The girl began moaning immediately; either she was faking it, or she was really starved for it.
Mark looked over at his sister. Her legs were crossed, presumably to hide her crotch from him, but all it did was stretch her jeans tighter and show off her thigh. She glared at him. “Watch the screen, not me,” she ordered.
“Sorry, Ames,” Mark said, looking forward again. “You look nice today.”
“Thanks. Shut up.” Amy fidgeted a little. On the screen, the cheerleader had her tits out and was on her knees. “You can touch yourself if you want. The goal here is to associate endorphins with Liz.”
Mark chuckled, reaching down to unfasten his pants. “Thanks for the permission,” he said, winking at her and pulling his cock free.
Amy’s eyes flicked downward for a split second, then back up again. “Just don’t aim that thing at me,” she said dryly.
“Wouldn’t dream of it,” Mark replied, wrapping a hand around it and slowly stroking as he watched the cheerleader spread her legs for her boyfriend. Shaved bald, of course, so you couldn’t tell she wasn’t a real blonde. “Hey, is he smaller than me?”
Amy watched the “actor” slide into his partner. “A little,” she replied. “I wasn’t really looking at the guys when I picked the videos.”
Mark sighed. “Amy, I dunno if this is doin’ it for me,” he complained.
“You’re not trying. Just imagine. It’s Liz right there, wet and moaning for you. She wants you to fuck her because she’s in love with your dumb ass. She’ll let you do whatever you want to her.”
Mark felt his dick harden, but not in response to the images. Hearing Amy talk about Liz that way was intensely hot. “Keep going,” he said, trying not to make it obvious when his eyes flicked over to her and back again.
“She wants you. She’s begging for more. She wants your big, hard cock to slam deep inside her. Look, she’ll let you manhandle her like a fuck doll.” On the screen, the boyfriend had grabbed the cheerleader and flipped her over, and was now thrusting hard into her. “She needs you to make her feel whole.”
Mark had to loosen his grip to keep from going too far. Amy’s voice was sultry, a little dark, and it made him want her more than ever. He imagined what it would be like, sliding deep inside her until his hips pressed hard against that big, perfect ass.
“Are you close?” Amy asked, looking over at him.
“No,” Mark lied, taking his hand off his throbbing dick. “Something’s wrong. I just… I can’t get into it. I keep thinking about the fact I’m not actually doing it.”
Amy sighed. “Come on, I don’t want to sit here all day.”
“Well, you could always help me out,” Mark replied, trying to make his voice sound neutral or even bored. “You know, so it feels like Liz is actually with me.”
“Gross, Mark. I am *not* going to jerk you off.”
“Please? I almost felt like I was there when you were talking.”
Amy chewed her lip for a moment, the silence only pierced by the tireless moans of the computer speakers. “Fine,” she said finally. “But you can absolutely not look.”
“Of course not,” Mark promised. “That would ruin the illusion, ‘Liz’.”
“Right.” Amy slid a little closer and reached over, sliding her fingers around Mark’s shaft. They were warm and soft, and the grip was snug without being too tight.
Mark groaned as blood once more rushed down into his crotch. “Oh that’s nice,” he said. His eyes stayed locked on the screen, but he let them go out of focus so he could shift his attention. Amy, his beautiful, smart, sexy sister, was holding his cock. Her hand was starting to move up and down, stroking him, bringing him pleasure because she loved him. Because she wanted him to cum. She didn’t realize the extent of it, not yet, but she would.
“Is that good?” she asked. Her thumb rolled across the tip, collecting the fluid that had drooled out there and smearing it down his rod.
“Ohh yeah,” Mark replied. “Good girl, A- ah, Liz.”
Amy didn’t reply, but kept stroking smoothly along the entire length, never quite stopping. “Are you close now?”
“So close. Talk to me, Liz.”
Amy hesitated for a moment before speaking. “Please Mark, cum for your Liz,” she said softly. “She needs it so much.”
Mark closed his eyes and remembered Amy’s body from the night before as the pleasure ripped through him. His hand shot over and gripped his sister’s thigh while his cock throbbed and pulsed, shooting his seed all over his lap and her fingers.
To her credit, Amy kept stroking until he was done. She clearly knew what she was doing. When Mark finally relaxed and opened his eyes, the warm hand finally released. “Uh, I’m gonna clean up,” Amy said, getting up and retreating into the bathroom.
Mark lay back on the bed to look at the ceiling and listened to his heart pounding. A minute later, Amy emerged, drying her hand with a small towel. “So, um…”
Mark smiled and sat up. “Amy, that was awesome,” he said enthusiastically. “For a minute there, I was one hundred percent focused on Liz. You got all those weird thoughts completely out of my head!”
Amy’s face brightened. “Really?”
Standing up, Mark closed the distance between them and grabbed her arms. “You’re the best sister ever, Ames. Can we do it again tomorrow?”
“Tomorrow? Um, I dunno about that.”
“Oh come on, please! If we keep doing it I’ll be able to get you completely off that part of my mind, I just know it! Besides, this was your idea, and we’ve got lots more videos to go through.”
Amy was blushing. “Alright fine,” she conceded. “Just until you and Liz are back on track.”
Mark pulled her in for a hug. He savored the feeling of her big tits pressed up against him, even through the layers of clothing. “Thanks, sis. See you tomorrow!”
—***—
Amy’s heart was pounding in her ears as she left her brother’s room. She could still smell the sweat and the coppery tang of cum, even after thoroughly scrubbing her hand and wrist. “That was weird,” she muttered to herself, walking quickly away.
Weird, but successful. Mark would be free of his strange obsession soon, and then they could go back to being best friends again. She just had to put her doubts aside and help him out a little.
—***—
Mark kept up the act the next day, and the day after. Each evening, Amy would come over. She would sit next to him on the bed while he chose a smutty video for them to watch. And once things started getting hot, he’d reach over and put her hand on his dick, then enjoy a skillful handjob from his sister while she talked dirty about his girlfriend. He made sure not to cum at any other time, so there was always a nice mess for her to clean up, getting her more comfortable with the feeling of his spunk on her skin.
On the fourth day, he decided to go further. When Amy went to clean herself up, he followed. She was wearing a pair of loose shorts and a tank top, having relaxed her dress code again. Her back was to him and she was soaping up her hand over the sink.
Mark walked up and wrapped his arms around his sister’s waist. She flinched in surprise, but quickly relaxed again. “Thanks again, Amy,” he said, kissing the top of her head. “You’re so great, helping me out with all this.”
“Yeah, well, I just want things back like before,” she replied. “Leggo, I gotta dry my hands.”
“In a minute,” Mark cooed. “Let me just hold you for a second. Don’t you like being held?”
“I’m not answering that,” Amy said. “Don’t get weird on me again, Mark.”
“Nothing weird. I just want to show you how much I appreciate all this. Although you gotta admit, a part of you likes it.”
“What? No, I-“
“This part,” Mark continued, sliding his hand down under the waistband of her shorts. His fingers unerringly sought and found her pussy, burning hot under a simple pair of cotton panties, and started stroking and rubbing her.
Amy squirmed a little, but Mark’s free arm was strong enough to keep her in place. “Mark stop, I- mnh…”
“Shhh.” Mark leaned down and kissed her earlobe. “You make me feel so good, just let me repay the favor.” He pulled her panties to the side and felt at the soft folds beneath. She was already wet, like he’d thought.
“Mark, this is the- mnh- the opposite of what we’re supposed to do,” Amy complained. Her knees were already wobbling a little under his teasing.
“I know,” Mark replied. “But I also know that Greg isn’t treating you like he should. This isn’t about you and me. It’s about you. I want you to feel as good as you deserve to.” As he spoke, his fingertips continued stroking and teasing his sister’s opening, learning and mapping, listening for her breath to catch when he found the right spots. Hooking his hand a little, he spread her lips and slid his middle finger inside her.
“Ohhh,” Amy moaned, almost going limp in his grip. “Mark, I-“
“Shush,” Mark commanded, putting an edge in his voice. “You’re already close, just let yourself go.” His finger stroked her inner walls, a passage so tight it felt like she would dislocate his knuckle if she sneezed. “Think of whoever you want. Let yourself cum.”
Amy whined and shook in her brother’s grip. He knew that sound; he’d heard it more than once when they were teens and she thought he was asleep. It meant she was almost there. “Marrrrk…”
“That’s right,” he said soothingly. His free hand came up to stroke her hair. “Right there, good girl.”
Amy’s breath hitched and she let out a choking little cry. Her legs shook and Mark had to grab her again to keep her from falling down. He winced as her pussy contracted and pulled at his finger, trying to draw it deeper as the orgasm overwhelmed her.
And then it was over. Mark shifted his sister so she could hold on to the sink counter and withdrew his finger, sucking the honey-sweet juices from his skin before drying his fingers on his pant leg.
“I… I have to go,” Amy whispered. She kept her eyes low as she pushed past her brother, snagging her bag on the way out the door.
Source: reddit.com/r/sexystories/comments/cche7t/inc_mf_hj_seminc_markamy_chapter_4