HEY! I know it's been a long time and all (I guess... for me?) but I'm back and here's the 4th installment :) hope you guys enjoy, so grab a beer (or a soda!) and relax :D


Chapter 4, Sister Sweet

"This," Derek announced, "is Marti's old baby monitor."

Ed grimaced, looking down at the contraption laying so helpless in Derek's outstretched hand. And then he looked back up at his brother, weary, awaiting his fate.

"So this is what I want you to do. Radio me as and when you feel it's necessary. Like when Dad and Nora are about to call back to check on Casey and me, or when they've decided to come home, or even if they so much as sound like they suspect anything – anything – between the both of us. Got it?"

Ed nodded grimly. "Do I have to?"

"Shut up," Derek knocked him on the upside of his head. "I'm trustin' you, Ed. Case and I could use a little help right about now."

"Alright, alright!"

"Oh, and keep it off at all times unless you're gonna radio me," he walked over to his dresser to grab a couple of extra batteries just in case. "At all times."

"Why?"

"Because if you turn it on," Derek handed Edwin the batteries, "you'll hear us having hot, passionate sex in every bleeding room of the house."


"Edwin! Time to go!"

"He'll be right down, Mom! Okay, so don't forget what I told you," Derek instructed, hurrying his brother down the stairs. "Remember – anytime they want to call or talk about us or say anything that might sound like they're suspicious and keep the –"

"Radio off at all times, got it," Edwin mumbled, still sounding a little reluctant.

And that wasn't something Derek liked to entertain.

"Listen, Ed," he put a hand on his brother's shoulder and let his fingers bite in hard, "you're going to do this for us. Casey's paranoid about getting caught as it is, and I want to try to ease that tension. You will help, Edwin."

"Wow," Edwin murmured, shocked, "you really are in love with her, aren't you?"

"In love with who?" Nora asked.

Derek and Edwin froze over at the foot of the stairs. Nora was at the doorway, putting on her coat and waiting for the youngest man in the McDonald-Venturi household. "In love with who?" she asked again.

"What?" Derek leaned in to ask pointedly as if he hadn't heard.

Nora only smiled. "I want to hear about her when I get back, Derek," she teased him, then motioned for Ed to join her. "Come on, Honey, everyone's waiting in the car."

"Right." Edwin buried the monitor deeper into his jacket pocket and headed over to her.

"Alright, Derek, I expect Casey and you to behave. The dinner will run quite late so I think we'll be back home latest by one or two a.m. and – please – no friends over?"

"No friends," Derek promised.

"Where's Casey, by the way? I always feel so much more com fortable handing the control over to her before we leave…"

"She's in the tub," Derek rubbed his neck. "I'll let her know when she comes out."

"Okay. Be good, Derek," Nora called.

And those were her last words before she ushered Ed out of the house, and left as well.

Derek felt the hot air rush out of his lungs like a straining balloon finally being released. He felt so good. He felt so free. He felt… himself. It almost seemed as though he owned this house now. As if he was the man, the head, and his beautiful wife was upstairs in the bath, relaxing.

A shiver tickled his back just thinking about it.

And so he grabbed a quick breath mint before making his way up the stairs, taking longer than he usually would in the hopes that it'd build up the anticipation. And when he slipped himself into the bathroom, when he shut the door behind him and laid eyes on Casey in the tub, his senses began to reel.

How perfect she looked, sweating slightly from the heat of the water. Her hair was tied up messily, the bubbles covering her up much too much for his liking. He smiled at her.

"Hey."

"Hi," she returned him gently. "I take it they've left?"

Derek nodded, trying to see her through the soap. He couldn't see much – and it was absolute murder. He pulled off his shirt, preparing to join her, pulling out the baby monitor from his back pocket, too. He set it down by the sink and began to undo his belt.

"What's that?"

"Marti's old baby monitor."

Casey gave a short laugh. "What's it for, Derek?"

"Well," he exhaled, slipping out of his jeans, "I passed the other to Edwin so he could radio me."

"You couldn't just ask him to call you instead?"

"That'd be pointless, considering he doesn't have a phone, and would have to borrow Nora's or Dad's – don't you think?" he asked, pulling down his boxers.

"I don't know," Casey whispered, staring at him. "Why don't you come over here and make sure I stop thinking altogether?"

His lips curved. "I'd be glad to."

He eased himself into the tub behind her, letting his body curl around hers, moulding into her form. His arms came around her, taking her soft, pert breasts, squeezing her nipples. He felt her arch her back against him.

"Does that feel good?"

"Mmm," she purred, nuzzling back against him. "It feels so good…"

"Yeah?" he kissed her neck, trailed a hand down her stomach to cup her between the legs.

"Yeah," Casey groaned.

Her eyes closed sensually, rolling up into the back of her head. Her arms moved back too, curling around his neck to hold him.

He worked a finger at her clitoris, the other still by her breast, teeth nipping relentlessly at the expanse of bare skin lining her neck, her shoulders, her back. They couldn't've pried his hands away from her for anything in the world right then. But it was then that Casey shifted against him, opening her legs a little wider, reaching down to wrap her fingers around the hard length of him.

She started to stroke him.

He let out a loud, animalistic growl, and he was so sure it reverberated through every bone in her body.

It didn't take long before she was moving and easing herself onto him, letting him slide smoothly into her. Derek held himself back from harming her, plausibly holding onto her so hard that her fingernails would leave marks on her, scars, and sometimes even draw blood. He wanted to ram into her, over and over and over, until she was screaming so hard he would wonder to himself if she was doing it in pleasure or in petrifying pain.

Instead, he let her just sit there on him, unmoving.

He was in her, and the heat of her gripped him like no other, but they were unmoving.

Just… unmoving.

And he didn't quite know why, because they'd never done this in all of the days they'd been together – even before he'd fallen in love with her. They were always shifting, pressing, rocking their bodies against one another… but tonight was different in a good way. He'd never known how good it could feel to just be. He had his hands on her and she was touching him, too; they weren't even talking. The only sounds in the room were the occasion movement of water, or the pop of a bubble, and the sounds of their deep, long, satisfied breaths.

As if they might have been breathing for the first time.


Edwin was trying not to breathe altogether.

Jesus Christ – this goddamn restaurant had a kind of smell to it. Like a – like a gingery, garlicky… pretentious smell to it. It smelled like rich old farts, that's what it smelled like. He didn't even know why Nora and his Dad had to bring the entire family here anyway. They could've come themselves.

But then again, if they had, Derek and Casey would've lost a good chance to fuck.

Edwin's face twisted just thinking about it. His brother. And his sister. Well, Casey was his sister, right? I mean, he'd been around her long enough to think so, and she certainly did act so – toward him, anyway. God.

Oh God.

How was he supposed to tell Derek he wasn't okay with all of this?

"Daddy! I have to go potty," Marti sniffled from her chair. She was so small they could only just barely see the top of her head; she poked up from under the table, nose all scrunched up. "I really gotta go!"

"Oh, Marti, you're becoming a big girl now," George said carefully, leaning over to look at her. "Do you think you want to try going yourself, Sweetie?"

Marti's eyes tightened. She started to whine.

"Alright, okay," George got up and then dusted himself. "Come on, cutie, let's go. Anyone else need to pay the ol' piper? What about you, Ed?"

"Nope, I'm good," Edwin muttered, but on second thought, figured that the bathroom might give him some sort of relief – in the sense that he could maybe spend a little time with himself and think things over. This Derek-Casey thing was fucking with his mind, and hard. "You know what?" he got up, "I think I do have to go."

"And I should fix my make-up," Nora murmured, wiping her chin. "Hold on a second guys. Liz, you coming?"

"No," Lizzie groaned. She had her head on the table, tired out of her mind. She hadn't wanted to come, either.

"Alright, we'll be right back, Hon," Nora smiled gently, maybe a little apologetically, and the whole family got up and left for the washrooms.


Lizzie felt like crap. Honest to God that was how she felt and she really couldn't find any other word to describe it. She was pretty sure she was coming down with something, like a fever of sorts, and she was also rather particularly upset with something that'd happened at school today.

There… There was this boy she'd liked for some time now. His name was Jake, and he was the coolest. Liz couldn't even think of the words to express just how amazing he was – but today, he'd turned all of that around. He'd come after her. But it hadn't been in the way she'd dreamed of all this time; he'd been so much more degrading, demeaning… disgusting.

He'd tried to get fresh with her.

Swear –

They'd been by her locker, talking, and he'd asked her out. Lizzie'd been going out of her mind with ecstasy, oh Jeez, oh sweet Lord, and then he'd put his hand on her waist. That hadn't been the worst part, though. It was when he'd leaned in and kissed her, his hand crawling up to grab her breast, that her heart'd split open.

How could guys be so repulsive?

She thought that she would go home and speak to Casey about all of this. She was the only one alive who could really get through to Liz. She was humble and decent, and always managed to get it past her skull that sex was not what made a relationship. Casey had always taught Lizzie that love had to come first. Then sex.

But it just hurt so bad that Jake had to want the latter first; henceforth he did not love her as she'd mistakenly believed.

At this thought, Liz felt the tears coming on. She knew she couldn't sit here and cry, because if her mother happened to come back, she'd be interrogated to death on who and why and what and where and how – so she got up and decided she would spend a couple minutes outside of the restaurant before returning to their table. With Marti having to go potty (and George taking her, too) they were bound to take a good ten minutes or so.

But as she made her way out, she knocked into Edwin's chair. And then the weirdest thing happened – his jacket fell with a thud. There was a small cracking noise that came from it, then a white crackling noise, and soon after, Liz began to hear voices.

One male, and one female.

"God, this feels so good," the male was saying.

"Mmm… I know…" the female replied him.

Lizzie frowned. The first thing that came to mind was that maybe Edwin had something stashed in his jacket like a kind of transmitter or something that was most probably giving him telecasts of soaps – or radio – or something that could explain these voices. But when she picked up his jacket, she found something that looked like a walkie-talkie, though she couldn't have been too sure. The voices were coming out of it, and they were continuing some sort of conversation. They were rough and not so clear, but she could still make the words out, apparent as day.

"Have I told you how much I love your breasts?" the guy said.

The girl giggled. "I love your stomach. So lean, so soft, so tight…"

He laughed too. "I love your waist."

"I love your arms…"

"I love your sweet, perky ass."

Goodness – Liz turned the damn thing over in her hand and tried to turn it off already, because obviously, whatever gross stunt Edwin was trying to pull, she wanted no part of it – until, of course, something so shocking came out of the thing that she almost sent it flying into the nearest wall.

"So you like my ass, huh?"

"Aw, Casey –"

"Derek –"

"Fuck – that feels amazing –"

"Oh – oh God – oh God –"


"Fuck!" Derek burst out, exploding into a massive orgasm, letting it course through his nerves, shaking his entire body. He felt himself become bigger and leak his soul inside her, felt her throb around him, felt his heart beat ten million times faster. "Jesus, save me, I think I'm dead…"

Casey panted pleasurably against him, turning over to see his face. "That was great."

Derek nodded. "It was. I love you. I love you so much."

"Did you know not moving at all could make us feel that much?"

"Not – at – all," Derek kissed her with every word. "But God, it felt so fucking good."

Casey smiled. "It did."

They spent a couple of minutes in the silence. Derek curled his arms tight around her after that.

"I'm hungry," he said.


"And the food's still not here yet?" Edwin groaned, returning back to their restaurant table, "how long have we waited?" he complained.

"Almost an hour and a half," George mumbled, helping Marti get into her seat.

"Maybe we should ask?" Nora suggested.

All of them got back into their chairs, Edwin slumping down hard on his. He was hungry. His food wasn't here. His brother was fucking his sister, and all he really wanted to do was –

"Hey, Mom, maybe we should go home," Lizzie said.

Edwin looked up.

And Nora considered this. "Think about it, George. I mean, it is getting a little late, and Marti is getting a little sleepy…"

"You're right," George sighed. "I guess too much is too much. I'll call the kids –"

"And give Derek a heads up?" Liz snorted. "I don't think so, George. I think we should just show up unannounced and see if he's been sticking to the rules. Hell, the both of them."

George smiled. "I like that. I like the way you think, Liz."

"No –" Edwin stood up. "I think we should call. What if something happened, or –?"

"Edwin," Nora calmed, "relax. I'm sure everything's fine. This will be a pretty interesting experiment, though," she agreed. "I'd like to see what the kids are up to."

Edwin closed his eyes. Okay. So this was what Derek'd been talking about, right? He could do this. All he needed to do was radio the guy. Edwin reached behind his chair for his jacket, groping for it. Two seconds in, he realised that there nothing in it. It was empty – flat. No, it had to be there, the monitor had to be there –

Jesus, Derek would kill him if he –

"Lost this, bro?"

Edwin's eyes shot over to Lizzie. He saw her rising from her seat with her purse over one shoulder, the antenna of the monitor sticking out of the zipper. His eyes grew.

"Give it, Liz."

"Why do you need it?"

"Liz, I said –"

"I asked why you needed it."

At this, Edwin shut up. It came to him in a sudden realization that he wasn't in a bicker with his sister. He was in a ruthless game of divide and conquer, of break and bypass.

"Alright," he asked cautiously. "What do you know?"

"I don't know," Lizzie only replied. "What do you know?"

"I don't know what I know," Edwin murmured back. "But if I knew what I know, I don't know if I can say what I know, because I promised I wouldn't. But if you promised too, you wouldn't be playing cat and mouse with me, so tell me, what do you know?"

"I'm not telling," Lizzie said. "And if you don't tell me, you don't get the walkie back."

Out of the corner of his eye, he watched his parents pack up their things. It was a pretty quick drive back home. He had to tell Derek now, if he wanted to live later on. But he didn't have time with Lizzie playing games with him. He didn't have time…

"Fine," Edwin said grudgingly. "I'll tell."


"Mayo?"

"Definitely."

"Do you want ham, too?"

"Why not?"

"And what about tomatoes?"

Derek turned to look at Casey from his chair, frowning. "Jesus, is this the first time you've made me a sandwich?"

Casey looked up from the kitchen counter. "Talk to me like that again, and that'll be the last time I make you one to begin with."

He sat and waited sheepishly for a couple more minutes before Casey was arriving with his jumbo sandwich. He didn't know why he felt this hungry, but she had to be part of the reason; she always was. He smiled and let her settle down on his lap, even though she kind of sometimes blocked the TV that way.

He took a bite of the sandwich.

"Mmm, this is really good, Baby," he muttered, words all muffled by the food. "Thank you."

"You're welcome," Casey murmured, moving in to kiss his cheek.

He returned her kisses between chews, and when he finally finished the sandwich, the only thing he could really think about was being inside of Casey again. He wondered if she'd mind, because – well – they'd been having a lot of sex lately, and Derek didn't want to come across as an intercourse addict. Of course, the only thing he really was addicted to was her.

He moved his arms around her and lifted up her shirt, just enough for him to be able to touch her flat stomach. He ran his fingers around her bellybutton. She leaned back into him as he did so, and he took it as permission to continue. He kissed her shoulder, bit down on her neck, then slipped his hand down her shorts.

She jerked slightly.

He felt her breathing tighten and become erratic, and as such he intensified his actions – he moved his hand just a little lower and pressed into her perineum, made her squeal. After that, he circled her asshole.

He knew she liked it. She liked to protest and argue against that even more, but she liked him touching her there the most – and he was well aware of that. Ever since they'd begun to have sex, every time he'd accidently brushed his fingers there, she'd scream. She groan and moan and tug on his hair so hard he thought she was going to rip it out altogether. So he decided maybe he should milk the advantage. Maybe he if played with her ass more, she would actually consider letting him fuck her there.

But Derek was only two seconds into rubbing at her when suddenly, a kind of crackling noise erupted from under him.

Casey lifted off of him, turning.

He rose, too, and pulled the baby monitor out of his back pocket. Edwin was trying to radio him. He let Casey sit back down on him, and for a moment, forgot the world and sat there waiting for some kind of voice to come out.

And a voice did come out – but it wasn't Edwin's, not even close.

It was Lizzie's.

"The car's about ten minutes away from home. If there happens to be traffic, we'll be there in twenty. Go hide your boyfriend, Casey."

It'd in fact taken the family seventeen minutes to get home. Lizzie had counted them down, one by one, herself. She wanted to make sure that she'd given the love bugs enough time to prepare for the arrival of their mom and dad and siblings, enough time for them to stare in shock and wonder just how the hell their well-kept secret'd gotten out. Enough time for at least one of them to feel guilty.

For all she cared, they could've gotten caught.

But it was answers she wanted, answers she needed, and answers she couldn't get if anyone else found out.

When the family pulled into the garage and the kids lugged themselves into the living room, the first thing Nora and George did was assess the cleanliness of the place. They liked to think that with so much time left over and the two oldest kids at home all the time, they'd spend a little of it trying to spruce the house up.

Lizzie wondered what he'd do if she told them exactly what they were doing with their free time in the house.

Instead, she only kept her mouth shut and watched as they commented on the common room.

"The carpet could use a little dusting," George suggested. "And Derek, have you done the dishes?"

He nodded.

"Casey," Nora came over. "Did you polish the silverware today, Honey?"

"It's all done, Mom," Casey smiled, going over to kiss her on the cheek. "How was dinner?"

"We had pizza at the Wrack Shack," Marti said excitedly. "At least we didn't have to eat at the stinky restaurant!"

"Come here, Smarty!" Derek reached out, excited to see his little sister again. And Marti crashed hard into him. He picked her up in his arms, holding her tight against his chest. He didn't know what he'd do without this girl sometimes, he didn't know why – he loved her so much. "I missed you," he told her.

"I missed you!" Marti's loud screech turned into peals of giggles as he began to tickle her.

But they died away when Nora stepped to the pair, a glint in her eye. "So what's with this girl, Derek?"

"What?" he asked shortly. Marti slipped out of his hands. Out of the corner of his eye, he caught Casey shift uncomfortably. "What girl?"

"The one you're supposedly so in love with," Nora reminded.

"Love?" George asked. "Derek? Really?"

Lizzie watched them spitefully. "Casey, would you happen to know anything about that girl?"

Casey grimaced, backing away. "No, I – I – well, why would I be involved with Derek's affairs, anyway?"

"Interesting choice of words," Liz pointed out.

Casey frowned. "Liz –"

But before they could continue, and oh thank god, George cut them all off. "Alright, alright, enough about this talk of girls and love. Derek knows he's grounded, he's not allowed to date for six months – and it's only been one and a half. So keep your private locked away in his quarters, Derek. Come on, Marti, let's go get you all ready for bed. Nora and I'll be there to tuck you in, okay?"

He let her down and she ran off, parents following after. It was a good minute before they had finally left and their door slammed shut behind them, and the three kids were left alone in the living room. Derek grabbed hold of Edwin by the neck and rammed him up against the wall, eyes intent with murder.

"You told Lizzie?"

Edwin squirmed underneath him. "Derek –"

"Get off him," Lizzie flustered, trying to pry his hands away from the boy. "Get off him, Derek!"

"Answer me!" he roared.

"I made him!" Lizzie screamed. "I made him tell me! I found out! It wasn't his fault, it was yours!" she shoved him. "I trusted my sister – and then you had to come along and ruin her!"

"Liz," Casey began quietly, "he didn't –"

"Shut up," Lizzie whispered, already in tears now. "Just shut up!"

And then she flew up the stairs, taking them two at a time, making a beeline for her bedroom and praying to God that when she went to sleep that night, she would never, ever wake up.

Casey couldn't fall asleep.

She was wracked with guilt. I mean, why wouldn't she be? Derek himself was beginning to get a little agitated by having now exactly half the family know their secret – why shouldn't Casey be bothered, too?

You have to make her promise, Derek had said earlier. You have to make her swear she won't tell anyone, Case. Or we're done for.

To be honest, it didn't really matter that Lizzie knew. It'd mattered to her when Edwin knew, because she hadn't known Ed for too long before he'd seen them at it. She hadn't known him too long at all. But Lizzie, she'd known all her life. So when Lizzie's voice had crackled out of that baby monitor, the least that Casey had felt was relief. She wouldn't have to hide her dark, seductive secret any longer from her little sister – her sweet, kind, good-natured, understanding little sister, the one who was always there for her.

Or so she'd thought.

After finding out – and Casey had no idea how – Lizzie hadn't talked to her. Or Derek.

She was, however, on good terms with Edwin.

Casey'd believed her when she'd told them how Edwin hadn't confessed this sin to her, but how else could she have figured it out? Weren't Derek and Casey being stealthy enough? Weren't they being careful enough? Or were they not trusting the right people?

Desperate for her sister back, Casey snuck out of her room that night.

She knocked quietly on Lizzie's door, noticing how the overhead light was still on, but there was no answer. She let herself in.

"Liz?"

She was on her bed, curled up with her headphones on – though Casey was pretty sure that the music was off. It was a habit of Liz's to just lie there and stare into the walls and all that, trying to focus on something else just to get her mind off of things. Just like Casey did.

"Liz," she sat down, "I'm sorry for not telling you. I really am."

"I'm not mad that you didn't tell me," Lizzie answered in a monotone voice.

Casey chewed her tongue. "Well, then, I'm sorry that I had to pick Derek to have a relationship with. I know he's our big brother, and –"

"I don't care that he's our step-brother."

"Oh," Casey swallowed the rock in her throat. "That's so great. I mean, I thought I was going to have a really hard time trying to convince people that we really are made for –"

"I'm mad that you're having sex with him. That you gave into lust. That you decided to continue having sex with him, and that you allow him to touch you as and when he likes. I'm mad that you went against your own morals."

Casey blinked. Oh… that. "Listen, Liz, it's not like that. I mean, I know it looks like I caved into him, but it – it was an animalistic kind of thing to begin with, and I just couldn't stop myself from the start. I know it was wrong, and I know that I did – am doing – something unthinkable, but I've found this amazing relationship just blossoming beautifully out of everything. I mean, doesn't that count? I love him. I do. And he loves me, too. I swear upon it and nothing else, you know me. Besides… sex isn't all that bad, either."

Lizzie sat up and looked to her menacingly. "Where's the sister that told me never to give in to a boy? Where's the sister that told me how men only wanted sex, how we could never trust them? Where's the sister that slapped me for just wondering what it'd be like to have a boy's fingers between my legs?"

"Lizzie – I –"

"No," she stopped her. "You know what? That sister's gone. She was gone the second you met Derek."

"Lizzie," Casey's face contorted, "I'm still here –"

"Too bad, I want you to leave," Lizzie muttered. "So go, Casey. And please… just don't come back, okay?"

"Liz –"

"And don't worry," she whispered, showing her sister out. "You can go back and tell your boyfriend that I won't tell a single person what I know about my sister and brother. In fact, it's as if I don't have a sister at all."


WOW we are getting serious. ANYWAY. thank you for the sweetest review, it really honestly made my day.. and also, do continue to review me, because I'm getting really good ideas from you guys! I promise I won't take so long the next time, but since I am kind of tied up with another project, I can't really promise.. but I'm not going anywhere without finishing this story first. So don't worry about that. :) And I'm sorry if I made Liz seem like this angsty emo chick.. I just figured that there had to be some kind of balance, what with Derek and Casey's steaminess and Marti's bubbliness and Ed's reluctance, I thought I should just go ahead and add a little anger and feelings of betrayal. LOL. hope you liked it. :D