A/N: Thank you everyone for all the reviews! In exchange, I hope you all are ready for this chapter… HINT HINT! (Rated M for Mature!)

ThirdPOV

Derek nodded, "Sure, what's up?" Thinking it was about biology.

"Can I kiss you?"

DASEY

It seemed like an eternity before Derek could completely comprehend what Casey had just asked him. He felt like his heart was about to bust.

"Why?" Derek chocked.

That wasn't the answer Casey was looking for. She felt herself begin to shut down.

Derek saw the light in her eyes begin to dim and quickly began to explain himself. "I need to know why Case." Derek took a deep breath and loaded his confusion. "Because I don't want this to move too quickly. I've wanted to kiss you since that day at the wedding. I wanted to kiss when you started dating Sam, Truman, and Max. I wanted to kiss you when you helped out my band. I wanted to kiss you when you basically carried me to graduation by your help. And I wanted to kiss you that night in the locker room."

"I wanted… to… to kiss you because…" Derek caught himself from stumbling over his words. "I wanted to kiss you because I've been in love with you for so long."

Derek then notice Casey had a far off look to her. He gently placed his hand on hers, scaring her and bringing her back to reality.

"Am I dreaming?" Casey whispered.

Derek shook his head and let it process a bit farther.

Casey was trying to come to grips that Derek was in love with her… That he had always loved her. Derek Venturi was in love with her.

But Casey wasn't sure…

Derek could read Casey like a book. He knew she would be struggling with all the information he just gave her. And he had a plan.

"Case," he brought her back again. "I have a proposition."

Casey raised her eyebrow, "Again?" She asked with a wary smile.

Derek smirked and then grabbed to hold her hands again. "How about a trial run?" At Casey's confused face he continued. "We do all the things couples do for two weeks. We hold hands, go out on dates- all that stuff. And if by the end of the two weeks if you are still unsure, we'll be friends."

Derek secretly knew there was no going back after this trial. He didn't know what he would do if Casey didn't come to love him back. The old Derek would have slapped him in the face but this time was different. It was different because it was Casey. She is, after all, the exception to all the rules.

Casey didn't have to think twice about the trial run. She truly wanted to see Derek as a boyfriend and not as a stepbrother. And it looked like this was the only way she was going to figure that out.

Casey took a minute more just to make him suffer. "Okay, I think that's a good idea. I just have two questions."

"Shoot," Derek said.

"What do we say when people ask if we're together? Also, are we still upholding our first proposition?"

Derek nodded, "Yes, we are still upholding our first proposition. As for when people ask, I wanted to leave it up to you. If I had to decide I would want to say that we're together. That way, if someone walks up to either of us, we can say we're seeing someone."

Casey hadn't thought of that and was extremely happy that Derek did! She paused for a moment to think. She certainly didn't want Derek to have the ability to see other people.

"I think we should tell people we're seeing each other… at least to try it out." Casey stated and waited for Derek's response.

Derek couldn't keep the smirk off his face. "So… How about we discuss that question you asked?"

Casey blushed and shoved his arm, "DER-EK!"

Derek quickly caught her arm and pulled her towards him before she could object.

And then their lips met.

Casey whimpered in surprise, but didn't pull away. Derek lingered for a moment against her lips but when Casey didn't respond he began to pull away.

Casey then finally awoke from her daze and grab the collar of Derek's shirt as she felt him pulling away. She pulled him closer to kiss him again. She had never felt anything like this before. Derek's lips were soft and warm and yet a tiny bit demanding. She could tell he was holding back. So Casey on her own, deepen the kiss. This time it was Casey who demanded a firmer kiss.

Derek was fighting himself mentally. He had waited so long for this. His dreams were nothing compared to the real deal. His mind was beginning to feel hazy as he began to become high on Casey's scent, her lips, her hand, everything.

Casey's hands traveled from his collar to gently stroke her finger tips along his neck. Her other hand tangled into the back of his head and pulled Derek closer. He gently pushed them back onto the sofa and Derek hovered over her at first. But Casey wanted more, she kept pulling until his entire body was molded against hers.

Derek lifted one of this hands to cup Casey's cheek and rub his thumb across. Derek took her lead and touched his tongue to her. Casey's mouth opened eagerly and accepted him.

Derek couldn't stop his body's reaction to the kiss. To Casey. And Casey could feel his body's reaction right against her most sensitive spot.

Casey had no idea how Derek got her so hot and wanton. She felt herself spread her legs farther apart and let Derek settle in between her. Derek groaned loudly into her mouth. He couldn't stop himself from pressing into her harder.

Casey broke the kiss with a groan. She threw her head to the side and shut her eyes. She was feeling so much at that moment, it was overwhelming. But she didn't want it to stop. As Derek took his opportunity to explore her neck she made her move with her hands. Casey slid her hands slowly along her back and kept moving south. As soon as she reached her destination of his ass she gave him a squeeze and push into her. Causing both of them to groan.

Derek nearly lost control then. He looked up to see his beautiful Casey eyes shut tight and biting her lip in pleasure. He took from her lead again and pushed himself onto her and rolling his hips to create more friction. Casey gasped as she felt her eyes roll into her head. It was so much better this time and she knew why, it was Derek. Knowing that Derek loved her made the feeling that much more intense.

Derek pulled Casey from her thoughts and kissed her again. This time they were both demanding and greedy for each other. Casey wound her fingers in Derek's hair moaning into his mouth as he began to set a pace grinding. Derek knew he was close and wanted Casey to go over the edge with him.

With all his bravery Derek slowly ran his hands up underneath Casey's shirt. Without removing his lips he cupped her breast, easily filling up his hand. They both moaned as soon as pinched her nipple through her bra and picked up the pace.

Casey could feel the knots in her stomach and lower. She knew she was close. And when Derek pinched her nipple she was gone.

She threw her head back against sofa and moaned as she reached her climax. She had never felt such a high.

Derek gave a last few rough grinds and pushes against her and finally groaned against her neck. Neither of them moved as they tried to catch their breath.

Casey turned her head to the side trying to catch her breath. Derek was doing the same only with his head on top of Casey's breast. He couldn't take his eyes off her rising and falling chest. Derek had never had such an intense climax. He smirked to himself as he thought if it was this good with clothes on, he couldn't imagine how it was going to be with clothes off.

DASEY

Neither of them had planned on falling asleep after such an evening. But they did.

Casey was the first one to awaken. At first she wasn't sure why she was having a hard time breathing until she looked down. There she saw Derek laying on top of her with his arms wrapped around her and his head resting on her chest. Noting the snoring, she knew he was still asleep.

Casey wasn't worried about missing her morning classes, she knew a friend who would help her out. What she was worried about was Derek and their situation. After last night she knew there would be no going back for her. Casey had never experienced such passion in just a kiss.

She touched her lips and grimaced at the soreness of them. A small price to pay for an amazing kiss… or rather kisses. Casey reached up with her hand softly combed Derek's hair. He looked so peaceful sleeping, but she had to get up, she needed to use the restroom and stretch.

Ever so gently she pushed aside all the hair that was covering his ear and took one large deep breath.

"DER-EK!"

Derek woke up with a yell and fell off the sofa and onto the hard wooden floor beneath him.

Casey quickly covered her eyes in embarrassment. She didn't think he would react so severely. Casey peeked between her fingers in search for an angry Derek, but found none. Instead she found a statue of Derek on the floor. The only thing that gave him away was when Casey peeked over the sofa and he saw her and frowned.

"Ow," he mumbled. Derek slowly picked himself up off the floor and rubbed his ass. "Jeez, Case, nice wake up call."

Casey grimaced. "I'm really sorry, I didn't think you were going to jump out of your skin."

As Derek continued to rub his ass Casey couldn't help but let out a chuckle. Derek, who had begun walking towards the bathroom, froze and slowly turned to face her. She had seen that look in his eye before.

Casey quickly tried to jump from the sofa but her leg was so asleep that she had to sit back down. This gave Derek the advantage. He pushed her back into her laying position and began tickling her.

"DER-EK! STOP!" Casey couldn't control the giggles and cackles that left her mouth. Derek just kept going. "DEREK! I'M GOING TO PEE ON THIS SOFA!"

That's when Derek did stop. He laughed at the situation and turned to use the bathroom.

Casey massaged her leg and was waiting on Derek to finish up in the bathroom. Derek quickly stepped out and held gestured Casey in. She smirked at him and he smirked right back. Both with a flirtatious twinkle in their eyes. She took the opportunity to use the restroom and wash her face. She noticed how wrinkled her clothes were and frowned. But then smiled as she thought how they got wrinkled.

Once Casey was out of the bathroom she noticed an amazing scent coming from the kitchen. Casey rounded the corner and saw Derek scrambling eggs and frying some bacon. She smiled at how domestic they were.

Derek felt her come in and finally turned towards her once the eggs were finished. "Grab some plates," he somewhat asked her.

She chuckled and rolled her eyes but did it none the less. Derek brought over two larger plates, one filled with the scrambled eggs and the other a mountain of bacon. They sat across from each other and began like they had been eating breakfast together, in harmony, for forever.

It was Derek who broke the silence first. "What are your plans for today?"

Casey finished chewing, "Um, I'll have to meet up with one of my friends from my class that I missed this morning—"

"Wait!" Derek stopped her talking. "You missed a class this morning and you're not freaking out?"

Casey shrugged with a smile. "Nah, I told you Kennedy has really mellowed me out. She taught me to become friends with at least three people in each of my classes in case I have to miss a day."

Derek's eyebrows rose but nodded in understanding. "Wow, I really need to meet this girl."

Casey nodded, "Yeah, I'd really like that. She's a really good person. She helped me a lot. I would really like it if you did meet her. I mean, since we're seeing each other and all."

Derek's face lit up at the sound of her mentioning that they were together. "Yeah, lunch?"

Casey nodded and smiled back. "So, did you have any plans besides the game today?"

Derek's face fell a bit, "To be honest, I had forgotten all about it."

"Hey," Casey reached across the small table and grabbed his hand. "No need worry, you've got a pregame ritual now."

Derek saw her wink at him and it went straight south. Casey MacDonald was flirting with him! He smirked. "So was that a preview last night? Can I expect the same performance tonight?"

Derek grew even more cocky when he seen Casey blush.

Casey cleared her throat out of nervousness, "Well, we'll just have to wait and see." She glanced at him through her eyelashes. Casey knew she had won when she saw Derek take a big gulp.

Neither of them could wait for the pregame ritual to begin.

A/N: Hope everyone is having a great holiday! Please leave a review, tell me your thoughts! This is my favorite chapter so far!