Author's Note: Thanks for the feedback, I appreciate it! Here's another chapter, hope you all enjoy!

Derek snuck into his house way past curfew. He wasn't alone either. He had Ashley attached to his right hand. She was giggling to herself about sneaking in, and Derek pressed a finger against his lips, telling her to be quiet. He helped her up the stairs. They had gone to a party just for a little while, some jock's party, and Ashley had had a bit too much to drink. She begged him to take her home with him so she wouldn't have to go home drunk to her parents. Derek, who was very sober, agreed to it. She had helped him forget about Casey for a little while, so he felt did sort of owe her for that.

Casey, of course, heard the scuffle through the thin wall separating her bedroom from her stepbrother's, and curiously stepped out of her bedroom to see what was going on. Sure, Derek often snuck in past curfew… but he usually didn't make this much noise when doing so.

"Derek, what are you—" she stopped and her eyes widened as she saw Derek helping a giggling blonde onto his bed.

"Hi, I'm Ashley!" the girl exclaimed loudly when she saw Casey in the doorway.

"Shh!" Derek hushed the girl, looking up to see his stepsister staring at the scene in confusion. "She's drunk," he explained simply.

"I can see that," Casey noted. "What is she doing here?"

Derek shrugged. He really didn't have to explain to her, did he? He didn't ask about her and Sam's dates… although Sam usually went into great detail about them anyway. Much to Derek's aggravation.

"Well, you better settle her down or Mom and George are going to come up here," Casey snapped and turned on her heel, padding her way back to her bedroom in annoyance.

Derek finally did get Ashley settled, and he figured she had finally passed out once he dimmed the lights. Groaning at his sore muscles from having dragged the drunken girl everywhere, he stripped down to his boxers and got into bed. He closed his eyes and began drifting off to sleep, and his mind immediately turned to his stepsister. How sexy she had looked in that dress. The things he wanted to do to her. Ravish her body. Make her breathless with his kisses.

He felt his body getting excited at just the mere thought of her, so tried desperately to think about something else. Anything else. Homework. Marti. Hockey. Puppies. Anything but Casey.

And certainly not the lips he felt moving down his bare chest.

Wait… lips!

Derek's eyes snapped open to see that Ashley had definitely not passed out. In fact, she had now stripped down to her panties and lacy bra, and was kissing a pathway down his torso.

"Ashley…" he immediately tried to push her away.

Ashley looked up at Derek in the dim light and grinned seductively. "Shhh…" she whispered, clearly still drunk, and forced her lips upon his. Before Derek could even react, Ashley's tongue was inside his mouth and her body was pressed up against the erection he had gotten from thinking about his stepsister.

"Ashley…" he tried again weakly as he felt her hands sliding into his boxers.

But he knew it was effortless. And he gave in.

Meanwhile, Casey was almost asleep when she suddenly heard the protesting of mattress springs begin crying out in a steady rhythm. She opened one eye, wondering what the hell it was. Sitting up, she heard another noise and realized that it was coming from the room next to hers. Derek's bedroom.

The mattress springs continued steadily creaking, and she heard moaning and grunting soon following. Her eyes widened and she pressed a hand to her mouth in surprise as she realized what it was. Derek and Ashley having sex. In the room next to hers.

"Oh, ew," she gasped out. She had figured that Derek wasn't exactly a virgin. But she had never actually heard him having sex in the bedroom next to hers. This was something new.

Her cheeks heated up despite herself as she was forced to listen to her stepbrother and the blonde groan and gasp in pleasure one thin wall away. She felt her whole body flush and kicked her blankets away to cool herself off. She didn't know why it was affecting her so much… why she desperately wished that Derek wasn't doing it with that trashed slut from their school.

Through all of her thinking, she heard the faint moan of "Casey!" through the thin wall.

She froze. And everything went silent.

They must have finished.

But… "Casey"…? Had she heard her stepbrother moan out her name while he was screwing the school slut in the room next to hers?

No, she decided to herself firmly. And she fell asleep forcing herself to believe that it had just been her ears playing tricks on her.

Note: Like how I used the name "Ashley"? snickers ;-)