Author's Note: Here's the last chapter! This chapter gets a little... err heated towards the end... not explicit, though. But still, just to warn you ;-) Well, hope you've enjoyed this even though it was a lil bit different from my usual stories... look for more LWD stories from me coming soon!

Casey couldn't sleep. She tossed and turned for half the night before giving up completely. She would just have to look like hell tomorrow.

All she kept hearing was Sam yelling at her on the phone. He had broken up with her, as expected.

And all she kept seeing was the hurt look on Derek's face when she ignored him at dinner.

She had cried until there were no tears left. She didn't know what she cried more for—losing Emily, losing Sam, or losing Derek.

She had a feeling she was more upset about losing the one she shouldn't have had a relationship with in the first place.

She should have just kept it as a step-sibling, barely existent kind of relationship. Or even one of those sibling love/hate relationships. But no, she had to let her hormones lead her right into Derek's arms—and onto Derek's warm, full lips.

Casey groaned, sitting up in bed and turning the lamp next to her on. She had to stop thinking about Derek. She had to either not think of him at all, or at least start thinking of him as a brother—the way it SHOULD be.

But it had been so hard to tell him that he couldn't come in that night, to push him away, to tell him to leave her alone. It had to be done, but it was so incredibly hard. She wanted nothing more than to let him come in and take him into her bed and let him hold her. She always felt so safe in his arms—so wanted. He was the only one that made her stomach do flip-flops.

Yes, not even Sam did that.

She should have realized it then that she was getting in too deep with her stepbrother. Keyword being "brother."

At the same time, Derek was lying in his own bed, staring at the ceiling, unable to sleep. All he could think about was Casey. He couldn't believe that they were over. This relationship that nobody had known about—well, until now—had been the best thing in his life. Casey had been good for him. She made him smile, made him laugh. Let him be himself without having to always act all cool and suave like he did in school.

And now it was over, just like that. No more late night cuddles or early morning make-out sessions. No more silly tickle fights or forbidden flirting.

His heart ached for the first time.

Not able to stand lying in the dark room, listening to his own thoughts in the deafening silence, Derek left his bedroom and walked downstairs into the living room. The whole house was quiet, so, before his thoughts could get at him again, he turned the TV on and sat back in his favorite recliner, drowning himself in mindless television just to try to rid the pain of his broken heart.

Casey walked down stairs to get herself something to eat. Her stomach was rumbling because she hadn't eaten much at dinner and it wasn't like she was sleeping anyway. Her eyebrows furrowed when she heard the TV on. What was somebody doing up at this hour?

She padded into the living room and found Derek sitting there, his eyes glued to the television as if he had never seen that particular McDonald's Happy Meal commercial before. She tried to will herself to keep moving into the kitchen, but her body just stayed there, frozen in place, staring at his motionless form.

He didn't even seem to be blinking.

"Derek?" she found herself asking, her soft voice nearly lost in the sound of the television.

But Derek heard her. His eyes quickly moved away from the television and he looked at her. Surprised to see her, he just said her name. "Casey."

She bit her lower lip. Maybe it had been a bad idea to come downstairs in the first place. "Uh… are you okay?" she asked awkwardly.

"Just dandy," he said sarcastically, his voice turning gruff and his eyes narrowing.

Casey swallowed uncomfortably. "Uh… okay then…" she quickly bolted into the kitchen to avoid anymore of the conversation. She numbly made herself a peanut butter and banana sandwich and sat down with it and a glass of milk. She ate in the dark, slowly and soundlessly.

She was almost finished when Derek burst in, causing her to drop her sandwich in surprise.

"Casey, I don't give a damn about Emily or Sam. And I don't care how screwed up this whole thing is. Or how much you hate me right now. Because I need to tell you this," he grabbed her hands. "I love you."

Casey's jaw dropped open.

"I love you and I want you and I know you don't love or want me, but I needed to tell you that because my heart hurts and I just want the pain to stop," he said each word forcefully, intently staring right into her eyes in the dimly-lit room. They stared at each other for a long three seconds before breaking eye contact.

Derek, feeling glad to get it off of his chest, dropped Casey's hands and left just as quickly as he had come in.

Casey just sat there frozen, her eyes wide and mouth still hanging open.

And, in the dark shadows of the kitchen, crouched down under the counter, a young girl gave her stepbrother a triumphant smirk.

Casey lied back down in her bed, a million thoughts racing through her mind. But one thought rang above them all: Derek… loved her?

It was wrong. So wrong. They loved each other… and not in a brotherly-sisterly way. Not in the way that they should love each other. Not in the way Edwin and Lizzie loved each other, or in the way Marti loved Derek. Not in the way Sam loved his sisters and Emily loved her little brother. Not in a way that was at all conventional or right in any way.

Derek sat on the floor of his room, absentmindedly twirling a hockey puck in his hand, thinking about Casey. He had told her that he loved her. He hadn't meant to do it… but his heart had practically demanded that he did. He had never experienced this type of aching before… this brokenness.

And he didn't like it one bit.

He thought if he got it off of his chest that it would go away. It didn't. As he sat there in his bedroom silently, the pain still lingered.

He looked up, startled as he saw his door gently push open and Casey's face appear out of nowhere. She immediately found him on the floor and gave him an unreadable look.

"Can I come in?" she asked quietly, but her voice seemed so loud in the stillness of the night.

Derek nodded, not making a move. He was curious, but didn't want to appear overtly so. What was she doing here?

Casey shut the door softly behind her and rested her back upon it, afraid to come too close to her stepbrother. "Uh… I think we need to talk."

"I already said all that I had to say," Derek replied. But his words weren't harsh or firm, only matter-of-fact. Passive. Emotionless.

Casey nodded slowly. She knew that this wasn't going to be easy. "Derek… this whole thing… we should have never started it. It's wrong on so many levels. We both knew that it could never be," she looked away from him, over at the records on his wall. Anywhere but his eyes. "All we ended up doing is getting ourselves hurt and hurting the people around us."

Derek grew angry at that. He stood up and in two strides was right in front of Casey, causing her to flatten against the door in surprise at his sudden movement. His eyes flashed with anger. "So it was nothing to you, Case? Just some kind of… hormonal release for you?" his words were biting. She actually winced as he spoke them.

But she said nothing. So he continued.

"What was it, Case? Were you just letting out your sexual frustrations on me? Getting back at Sam for being so slow?" he growled. She looked away and he grabbed her, forcing her to look at him.

"Derek, please…" she said softly, her eyes filling up with tears.

"Are you trying to tell me that you felt nothing?" he glared at her pointedly. "Say it, Case. Tell me that you feel nothing for me." He was challenging her, egging her on. She had never seen him look so angry before.

"Tell me that you feel nothing," he quickly crushed his lips against hers. He pried her lips apart in order to thrust his tongue into her mouth, forcing all of his anger out. Casey could do nothing, not even able to move away.

She wasn't sure if she wanted to, either.

Her tears slipped down her cheeks as Derek grabbed her by her hips, his fingertips digging into her flesh painfully.

"Say it, Casey," he demanded against her lips.

She still didn't reply. He pulled her towards his bed and pushed her down. She didn't fight him as she felt the weight of his body on top of her, crushing her. His mouth vigorously began sucking on the side of her neck as his fingers began hastily unbuttoning her shirt one button at a time.

"Say it," he commanded, his teeth biting into her soft skin, sure to leave his mark on her. She let out a whimper, but still didn't speak. He got her pajama shirt off and grabbed the waistband of her pajama pants, ripping them off of her quickly.

Casey's mind screamed "Incest!" But her voice didn't sound.

Derek kept trying to incense her, insisting her to say that their relationship had meant nothing to her. But she just watched, tears rolling down her face, as he yanked off his own clothes.

When they were both naked, Derek grabbed Casey's wrists, pinning them above her head on the bed so she couldn't move.

"Say it," he said one last time. And this time, it wasn't harsh… it was more of a pleading.

"I can't," Casey's strangled voice came barely above a whisper.

Derek's body stilled above hers, taken off guard. "Why not?"

Casey's lower lip trembled. "I… I…"

And Derek's grip on her loosened. Because suddenly he knew. His face softened in realization. "Say it Casey, please…" he whispered, gently pressing little kisses all around her face, kissing away her tears, his whole demeanor changing in an instant.

"I love you," she finally murmured.

Derek felt his heart clench and stopped kissing Casey to look deep into her glimmering blue eyes. He felt her right hand try to move so he quickly released it, and she ran her hand through his sweat-matted, wild hair before cupping his cheek.

"I love you so much, Derek," she whispered, her eyes directly on his. "I'm just so scared that it's not right…"

"It is right," he told her insistently, his voice soft as he lovingly nuzzled her. "It's right, baby."

She closed her eyes at his gentle touch. "But Sam and Emily… and our parents…" she began to protest.

"Shhh," he chided her, pressing his lips against her forehead. "It doesn't matter. None of it matters. I love you."

Casey gave him a gentle smile. "Make love to me, Derek," she whispered, tracing his lips with her fingertip.

Derek smiled back at her, eager to comply with her wishes.

And the two of them decided that they didn't really care about who knew about their dirty little secret.

the end! feedback very appreciated!