Thanks so much for the reviews! I especially loved the one from Chitosi. Haha It's nice to know that you guys are enjoying what I write. Keep them coming! Oh, and btw, sry about the scrunched up writing before, my format was messed up. Lol Tell me if it's better now. Here's the next chapter… Hope u like it. : )

Oh, and still not owning anything except the clothes on my back… and front. Lol

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"Sorry, Casey. It's just… Are you sure you want this?" Derek asked, for once caring about what she wanted.

"Don't you want this?" Casey asked, now taking on the same sad expression.

"Case, I asked first. It doesn't matter what I want. This is your decision. Don't do anything you don't want to do to make me happy."

Casey paused for a moment before answering him. "Yes, Derek. I want this. I've wanted this since I first met you, honestly. But… do… do you… want, this?"

I slight smile crept onto Derek's lips. "Casey. Do you think I would be laying here underneath you if I didn't want this?"

Casey smiled back and kissed him lightly on the lips. Taking a deep breath, she lowered herself onto him. It wasn't her first time, but as he pushed into her, she felt a slight pain before she adjusted to him. Derek closed his eyes. She was so tight around him. He moved his hands so that they were lightly gripping her waist, and she began to move.

As she began to move slowly at first, she remembered how it had been with the other guys. She moved up, and as she came down she shifted forward and backward. Already breathing heavily from the feeling they were both getting, Casey began to move faster. The only thing that she could feel was him inside her, filling in that empty space, making her whole.

"Oooohhh, Caseyyy," Derek moaned as she picked up speed. Casey's insides itched for more. She began to come down on him harder, and faster. She fell into the rhythm. Up, down, forward, backward. She needed him deeper, so much deeper. She pushed down harder. Then even harder, as if it was the only thing keeping her alive. The feeling was spreading throughout her body. She had no thoughts. Her only sense still cooperating was touch. Her and Derek, touching.

Derek felt like he was on fire. He held his breath to keep from yelling out at every second. He noticed that Casey seemed to be getting tired. As the man in this situation, he felt obligated to relieve her, and so he moved his hands from her hips to her arms, and flipped them both around in a quick, easy turn. Now Casey was on her back and he was on top. Wasting no time, he plunged into her. Immediately he hit her soft spot, making her scream out in ecstasy. He thrust himself into her, each time harder, making a point to hit her spot every time. Casey bucked her hips, meeting his thrusts.

"Oh my God! DEREK!" she yelled as he sent her into oblivion with pleasure. Sensing that he was about to cum, Casey tightened up her muscles, trapping him inside her. Unable to keep thrusting, Derek whined.

"Caseeyyyyy, nooooo."

She smiled mischievously, and without loosening her muscles, began to moan and make other sounds of sexual pleasure. Listening to his stepsister's sounds, he became even more turned on than he thought possible. Already having been close to the edge, he was now feeling an unbelievable amount of pressure, and couldn't hold it. He groaned and winced, trying his hardest to keep himself from cuming. Casey continued to gasp his name and moan.

Breathing heavily and with much pained effort, Derek begged her to stop. "Casey, pleaaase. Oh God, Casey. I can't take it. Pleeaaaase. Casey. CASEY!" Derek's breathing was now very loud, and he was making grunting sounds, obviously trying desperately to control himself. Casey grinned. After suffering for a couple more minutes, Derek began to shift uneasily, trying anything to make her let him go. Deciding that he had suffered enough, Casey finally relaxed her muscles. Derek nearly collapsed with relief.

Unable to hold it any longer, Derek moved at a furious pace, thrusting himself as deeply into her as he could possible go. The pleasure was so great that Derek was even screaming in his thoughts.

"HARDER!!!" Casey screamed. He pushed down harder, crushing Casey beneath his weight. He began to twitch, and he felt Casey's walls tightening around him.

"Oh my God, DEREK!!!" Casey yelled, digging her fingernails into his back. "OH GOD!"

Casey screamed as they came together. Derek kept pumping into her, not wanting to let the amazing feeling go. He kept going, and it was unlike anything that either of them had ever felt before. Casey screamed and screamed, unable to do much else. They both shook with intense pleasure.

There was a banging on the bathroom door, and a girl's voice came from the other side. "YOU GUYS!!! THIS IS SOMEONE ELSE'S HOUSE!!! AND IN THE BATHROOM! GROSS! GO FUCK SOMEHWERE ELSE AT LEAST! C'MON, HAVE SOME RESPECT!!! YOU GUYS!!!!!! WHAT THE FUCK!"

Casey and Derek did not even notice that there was someone at the door. The door flew open, revealing Emily, Casey's best friend, looking infuriated. "GET OUT! CASEY WOULD KILL YOU IF SHE EVEN KNEW THA- Oh! Derek…" Emily immediately stopped yelling when the couple stopped moving, and the boy looked up. Seeing that it was Derek that she had just walked in on, she was stunned. She didn't even bother to look at the girl beneath him. Derek looked at her, his expression somewhat unreadable, one that she had never seen on him before.

"Oh my God, I-I am so sorry, Derek. I didn't… I…" Embarrassed, Emily looked away from Derek's face, her gaze falling on the girl beneath him. Emily choked and fell back, grabbing the door for support. "Casey?!"

"Um, hi… Emily…" Casey said, not really knowing what to do. THIS was now her most awkward moment ever. Wow, two top awkward moments in one day… one hour even. That's reaally nice,Casey thought sarcastically.

"WHAT THE FUCK! OH MY GOD! YOU GUYS ARE PRETTY MUCH BROTHER AND SISTER! HOLY FUCK! WHAT- WHAT WERE YOU THINKING?! I- I DON'T EVEN KNOW WHAT TO THINK! HOW COULD YOU- I DON'T BELIEVE- FUCK! THIS-THIS… This is SO wrong, on so many levels!" Emily finally stopped her outburst, running out of breath.

Casey and Derek just looked at her, all of them speechless.

"I'm just gonna go home now," Emily said, turning and walking away from them. Derek and Casey stayed there for a moment. Then, realizing that Emily had left the door open, Casey broke the silence.

"Uh, the door's open. We should probably go make sure the house is still in one piece, or at least close to it."

"Uh, yeah, right," Derek said, quickly moving off of her, now feeling somewhat awkward again. They both got dressed, and then Derek went downstairs first. Casey stayed in the bathroom until she thought there was enough time between their returns to the party to avoid suspicion. Not that anyone would really notice anyway.

Casey went downstairs to see Derek and some other guys drinking beer and laughing. Deciding that she should probably take on her role as Miss-Goody-Two-Shoes, she yelled for everyone to get out, shoving some people out of the door, and whacking those who disobeyed in the head.

After everyone finally cleared out, she sat down on the couch. Derek came over and sat next to her. "I was wondering when you were gonna come down and kick everyone out," he said, smiling.

"Haha, yeah. I figured I better come do my job," she replied, still feeling kind of uncomfortable around him.

"Hey Case?" Derek said, looking over at her.

"Yeah?"

He smirked at her in his trademark adorable, sexy way. (lol You know what I'm talkin bout.) "Great sex."

She smiled sheepishly… "Yeah, it actually was, wasn't it?" She put her head down on his shoulder.

"Casey?" he asked, shifting his head to look down at her.

"Yeah?"

"... I love you."

She inhaled sharply, then sighed before replying. "Good. I love you too."

He rested his head down on hers and held her hand.

"Derek, one thing," she added.

"What's that?" he asked, neither of them moving.

"Don't tell anyone," she said, knowing that it could only make things horribly messy if anyone knew. They already had to clear things up with Emily.

"Wasn't planning on it," he said.

"What about Emily?" she asked.

"Don't worry. I've already got a plan for her."

Worried about the tone in which he said that last thing, Casey asked, "What?"

"Haha, I'm gonna ask her out tomorrow so that she won't think there's anything between you and me."

"Ooooh. Good idea. Um, Derek?"

"Ugh. What?"

"We, um, still need to clean up the house."

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REVIEW!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! I've got plans for this story, and I'm thinking I'll try something a little different from the typical Dasey story. So, tell me what you think so far! Plz and ty! ; )