**Chapter 8**
It was pretty easy for Amy to slip into the mindset of being intimate with Mark. It was basically the same as what she’d been doing already, except without the pretense of trying to cure him of his attraction to her. In the mornings, they would have breakfast together before class. Mark wanted to have morning showers together, but Amy vetoed that request, pointing out that they hadn’t gotten very clean the first time they’d tried it, and “accidents” could happen if they made a habit of it.
They met again at lunch, although Liz would often join them, which made Amy a little uncomfortable. She still hadn’t figured out what to do about that whole situation. Mark had told her that he would handle it, but it still felt awkward to sit across from the perky, sweet girlfriend of the brother who was cheating with her and act like nothing was wrong.
After class, they would spend a little time apart. It was almost the only time Amy returned to her own dorm. They would handle homework and other obligations. And in the evening, Amy would go to Mark’s room with her next day’s clothes in her backpack.
Evenings were kind of amazing for Amy. With none of the stress of the previous weeks, she was able to relax and be herself again. Her confidence came back, and she stopped acting like some stupid meek kitten all the time. She got to hang out with her brother, watching movies and playing video games like they always did, and at the same time she got to spend time with the most loving and affectionate boyfriend she’d ever had. She even felt bold enough to dress a little more provocatively, wearing shorts or lower-cut tops and grinning wickedly when Mark’s jaw hit the floor.
Of course, Mark had trouble keeping his hands off her, so at some point he always would end up making a move. They’d be sitting there watching a movie on the bed together, leaning on one another, and Amy would feel the arm around her shift downward, stroking her side or rubbing her thigh. She’d turn her head and look up, and then suddenly they would be kissing, pressing tight together. They would touch and pleasure each other, completely losing track of time.
After they had both enjoyed a dramatic climax, they would cuddle up under the covers until they fell asleep. Am had never in her life felt so safe with a guy. She knew for a fact that if she’d spent the night in Greg’s bed, he’d never have been satisfied with some groping and a handjob.
Ugh, Greg… the thought of him made her shudder. He’d seemed so handsome and assertive, and she’d felt like she was special for catching his eye. But looking back, she’d never really been very happy with him. He always made her feel small, like she was an annoyance and she was lucky he took time out from his day to be with her. She’d gotten a little thrill when he’d called for her, but at the same time she’d had to fight against sexual escalation with every encounter.
Mark, on the other hand, rarely asked anything from her now that they were “together”. He would initiate contact, sure, and he certainly couldn’t keep his hands to himself… but he didn’t so much as pull her hand to himself when they were together. It was always her decision to reach over and start stroking him. Her choice to make him cum while moaning her name.
The following Friday, Mark asked her to come over early. Amy let herself into the room, finding Mark waiting inside. She locked the door behind herself and crossed the room to his waiting arms, pressing close and lifting herself up to kiss him.
“Mm, hey there, kiddo. Thanks for coming over.” Mark pulled her a few inches back and rubbed her arms, getting a good look at her. “I’ve been thinking about you all day.”
Amy was wearing a tank top she’d bought at a rock concert some months back. It was mostly black, and it didn’t entirely cover the straps of the black bra she wore. She’d had a leather jacket covering some of her skin for most of the day, but she’d left it back in her room. Below the waist, she had dark jeans and some comfortable walking boots. It was the kind of outfit that she like to think said, as the singer of the band on the tank famously and beautifully screamed, “Love bites, but so do I.”
“You look like you’re ready to kick some ass,” Mark said with a grin. “Remind me to stay outta your way.”
Amy gave him a wry smile. “Stop calling me ‘kiddo’ and you’ll be fine. What’s up, are we doing something today?”
Mark shrugged. “Yes, and no. Today is that concert I promised Liz I’d take her to. So I thought we could spend some time together beforehand.”
“Oh, right.” Amy stepped away and turned her back on her brother. “I forgot about that.”
“The tickets were her birthday present. I couldn’t exactly break her heart on that one.” Mark put his hand on her shoulder, but didn’t try to move or turn her. His skin felt hot, and Amy felt like she was freezing alive.
It sucked, but it was a conversation they both knew was coming. “Mark… what are we doing? Is this casual? Is it more than that? I mean, you still have a girlfriend. And I-”
“You’re still technically with Greg, yeah.” Mark scoffed. “Not that he’d notice.”
“Yeah, but Liz. She loves you. She doesn’t deserve to be strung along like this if you’re not serious about her…”
Mark’s arms wrapped around her midriff. “It’s too bad I can’t keep you both, huh? We could even share her.”
Amy flinched. “What?”
“Think about it,” Mark cooed, kissing her neck and pressing himself against her from behind. Amy could feel his erection through his pants. “I know you like girls, too. I’ve seen how you look.”
Amy rolled her eyes, despite the fact Mark couldn’t see it. “We’re in University, everyone is bi.”
“Yeah, I know, it’s silly. I just get excited when you come over here looking like you want me to molest you.”
“Ugh. That is SO not what I was thinking about when I got dressed today.”
“Oh yeah?” Mark teased. “Then why aren’t you wearing a belt?”
Before Amy could respond, Mark had reached down and unfastened her jeans, sliding a hand inside to rub her. She bit her lip. “O-okay, there may have been some thought in that direction-”
“Of course there was.” Mark kissed her neck again, moving his other hand up under her top to grasp her breast. It wasn’t a stimulating act, with the bra on, but it made Amy feel held in the way she couldn’t quite put her finger on. She always felt strangely calm when Mark had her in his grip.
“Mh.. Mark, no fair turning off my brain,” she complained. Her hips moved on their own, alternately pressing toward his touch and pack into his crotch.
“Shush. You love it.” He pulled her back a little tighter, turning her enough that he could lean over her shoulder and kiss her while his fingers probed t her entrance and teased her nipple through the bra’s silky material. “I called you over so we could have some fun, and I can talk to Liz with a clear mind.”
Amy forced herself to regain some control. “Well if that’s the case,” she said with a little chuckle, “shouldn’t we be paying- ah- paying attention to you?”
“In a minute,” Mark replied. Amy felt his finger begin to slip inside her. She was already soaked. “Take your top off.”
Amy let out a little moan, then reached down to the bottom of her tank. She pulled it off in one smooth move, dropping it to the side.
Mark’s hand moved around her back and unclipped her bra, then slid forward and under it to cup and squeeze her breast. “Good girl,” he purred in her ear, pulling her backward. “Come sit in Daddy’s lap.”
Amy scoffed, even as Mark sat on the bed and pulled her down. “Daddy? That’s just getting confusing.”
Mark grinned and bit his sister’s neck playfully. Somehow, the fingers of his right hand continued gently stroking in and out of her uninterrupted as he positioned her. “Just go with it, babygirl. Have a little fun.”
“What, the rest of this isn’t fun?”
“Amethyst Cath-”
“Okay, okay,” Amy said, shivering already at the sound of her full name. “I’ll be a good girl. Daddy.”
“Much better.” Mark turned her so she was almost sideways on his lap and leaned in to kiss her again. His left arm supported her, with his hand holding the far side of her ass. His right still worked between her legs. “It always feels better when you’re relaxed and going with it, doesn’t it?”
Amy’s breaths grew more shallow. “Mhmm…”
“No.” Mark’s left hand came up and wrapped around her throat. “Say ‘Yes, Daddy’.”
Amy’s eyes went wide, but were still clouded with lust. “Y-yes, Daddy.”
“Good girl.” He patted her cheek and stroked her hair, moving his fingers faster in and out. “You’ll do whatever it takes to make my happy, right?”
“Yes… yes Daddy,” Amy breathed. She knew she shouldn’t be letting Mark have his way so easily, but it just felt so good.
“That’s right, you will. You’re going to cum for me now, and then you’re going to get on your knees. Do you understand?”
Amy frowned. Since she’d given in to him, Mark had never asked her to go further than she’d gone. The leg thing in the shower was a one-off because they’d been excited; she’d never done more than stroke him otherwise. “Mark, I don’t kn-”
“Daddy,” he corrected her. “And you don’t need to know. You don’t even need to think right now. I’ll take care of you.” his left hand stroked her bare back soothingly. “I’ll be gentle with you. But I don’t like that you went further with Greg than with me. I can’t stand it any longer, so I’d like you to get on your knees for me. *Do you understand?”*
Mark’s words were punctuated with a shift in his hand, His fingers slipped out of her wet entrance and moved up to her clit, strumming it like a little harp between her legs. Amy squirmed and moaned. She felt her head nod. “Yes, Daddy,” she mewled. “I underst- understand.”
“Very good girl,” Mark praised her, leaning in and kissing her forehead. “Now, cum for Daddy.”
He didn’t need to say it, because she had no choice. Amy’s moans pitched up into a squeal of pleasure as the pressure building within her released, Her body shook, and she squirmed in Mark’s strong grip, part of her wanting to pull away from the overwhelming sensation while the rest of her wanted to push closer, to get more.
Mark kept going until her cries stopped, leaving her a panting mess in his lap. He brushed back a sweaty lock of hair that was stuck to her forehead and smiled down at her. “Your turn,” he said, sliding her down to kneel between his knees.
Amy’s legs were shaky, and she had to put her hands on her brother’s legs to keep steady. Her head was spinning, but she trusted him. She knew it was okay, for the moment, not to be in control. So when she felt Mark’s hand guiding her head forward until his cock pressed itself to her parted lips, she didn’t worry or panic. She simply opened her mouth wider to accept him.
Mark groaned as the head slipped inside her mouth. It was bigger than she was used to, but he wasn’t pulling her down. He simply guided her onto it, then let his hand slide down to rest on her shoulder and gave her an affectionate squeeze.
It was surprising how clean he tasted. And smelled. Amy rolled her tongue around her brother’s glans, learning the feel of it in her mouth and eliciting another groan. She brought one hand up and wrapped it around his shaft, stroking slowly while she began sucking on him.
“Oh fuck,” Mark whispered. “You’re so fucking good.” His hand went down to her breast, squeezing it firmly enough to make her nerves tingle excitedly.
“Mhmm,” Amy hummed, making her tongue vibrate against him. She looked up into his eyes, eyes that were full of want and need and love. Holding his gaze, she began moving her lips with her fingers, a slow forward-and-back motion that took him in further. Wanting to impress him, she took it down until half was in her mouth and the other half in her hand. It wasn’t enough to make her gag, not quite, but it still felt like the limits of what she could take inside.
“Oh god. That’s so good it hurts. Can you go a little faster?” Mark brought his other hand up to caress Amy’s cheek. “It won’t take long, you’re so beautiful like this.”
Amy nodded her head slightly, then sped up her movements. She bobbed her head up and down smoothly on her brother’s cock, using her fingers to stroke what she couldn’t reach with her lips, getting him wet all the way to the base. Her cheeks sucked inward, joining her tongue in stroking him.
Mark’s face was a mask of pleasure. Amy couldn’t help comparing him to Greg. Not just in size and taste and smell, all of which were an improvement, but also in how he treated her. Greg had pushed her down where he wanted her, acting like it was her job to do what he wanted. Mark, even playing his dominant “Daddy” game, was just the opposite. He hadn’t so much as touched the back of her head since she’d gone down on him. He moaned and complimented her, making her feel like she was really doing well. And most of all, despite the fact that she was trying her best to make him cum, she didn’t feel like a slut. Not even a little bit.
There was a tingle between her legs as Amy kept going. *Holy crap*, she thought, *I’m getting turned on from sucking Daddy’s- sucking Mark’s dick.* She reached one hand down, just to feel how wet she was, and moaned around him at the sensation.
“Fuck, Amy, it’s so good,” Mark moaned. “I’m gonna cum!”
Something took hold of Amy again. Maybe it was the low-key roleplay, or maybe just a desire to give Mark something new that nobody had ever had. She lifted her ass off her feet, raising her body up and popping him out of her mouth, then nestled her hand and Mark’s slick cock between her tits. She smiled up at him as she stroked him fast, making her flesh jiggle and rub against every part of him that her hand wasn’t touching.
Mark started to say something, but the words were trampled by a grunt of bliss. Amy flinched once as a spurt of something hot and sticky hit the underside of her chin. Her neck felt warm. She kept stroking him steadily, watching his eyes roll back and feeling the now familiar sensation of his cock pulsing in her hand. Her breasts felt hot and wet as her brother’s sticky load shot up between them and landed across her skin.
Amy heard Mark exhale in a way that told her it was over. She nestled him deeper in her cleavage and wiped her hand on one of the few places on her chest that wasn’t glistening with his spend. “How was that… Daddy?” she asked mischievously.
“Oh my god,” Mark said, looking down at her again. “That… you… fuck.”
“Thanks.” She chuckled, grabbing an unwashed shirt from the floor and using it to start wiping up some of the mess on herself. “Now you’ve done something nobody else ever did before.”
“You mean you never-”
Amy shook her head, leaning back and sitting cross-legged on the floor. Mark’s spent tool slid free, and she used the shirt to wipe it off a little too. “Greg always finished himself. And nobody before him got more than my hand.”
“Nobody?”
“Well, unless you count Kate-”
Mark coughed. “You and Katie?? I had such a crush on her in high school!”
Amy grinned. “I know. She knew, too. But I was more her type, and I was, you know, experimenting.”
“Jesus christ. C’mere and kiss me, you slutty minx.”
Amy rolled her eyes, but got up and sat next to him anyway, wrapping her arms around his neck and kissing him. “She did talk about maybe bringing you to bed with us sometime, but I didn’t think you’d be interested in anything like that. Shut up, I know I was wrong.”
Mark chuckled. “I love you, sis,” he said, kissing her again.
“I love you too, loser.” She winked, then let go of him. “You should probably head to that concert, then. Don’t wanna keep Liz waiting.”
“Are you sure you’re okay with that?”
“Of course. I love Liz, she’s a sweetheart. You can’t break her heart at her birthday concert.”
“Wouldn’t dream of it,” Mark replied with a smile. “See you tomorrow morning?”
“Sure,” Amy said, pulling on her discarded top. She didn’t want to put her bra on yet, in case it got stained by some residue on her skin, so she folded it and shoved it in the laundry basket in the corner that held most of the dirty laundry. “Show her a good time. Don’t let her do your laundry.”
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