Thanks for reading and please review!

**

Addison woke up the next morning feeling amazing. She had kissed Derek! She couldn't believe that a nice guy like Derek could fall for her as she fell for him. The rest of the night played out well. Mark apologized to Derek, and even though he hates it, he's going to not complain that Meredith is dating Mark. Addison became really close with Callie, Arizona and Christina. Izzie made many remarks about her and Derek even though it clearly embarrassed Derek. Alex and Owen mostly talked about sports and they convinced Addison to quit being shy and join some teams this school year. George was very nice to Addison, and he and his new girlfriend Harley convinced Addison to join the drama club with them. All in all, it was one of the best nights of her life. Suddenly there was a knock on her door.

"Addison," Her mom called bitterly. "Your father's here." Addison was so excited she flung herself out of bed and ran down the stairs in her blue silk night gown. To her udder shock, her father stood there, holding hands with a woman, a woman who Addison knew to be her father's secretary. He was the chief of staff at the hospital, so naturally he had a secretary.

"Hello Addison!" Her father said, waiting to take Addison in for a hug, though she did not budge.

"What the hell is she doing here?" Addison asked.

"Addison, don't swear." Her mom said sarcastically. She had a large smile when Addison questioned the presence of the secretary.

"I see you remember Karen." He said.

"Yes I remember her." Addison said, glaring at Karen. Even as a child she had suspected that Karen had other reasons for working for her father. He denied it one hundred times, and so did she.

"Hey Addie!" Karen exclaimed. She was the most annoying person in the world in Addison's opinion. Suddenly, Addison noticed a gigantic diamond ring on Karen's boney finger.

"You're engaged? You've been split up for not even three weeks! Your divorce isn't even finalized yet." Addison began, drawing to a startling conclusion. "How long have you been having sex with her? How long have you been cheating on mom?" He paused for a second.

"Since I hired her." He sighed.

"That was when I was like 2!" Addison cried. "That's like 13 years!"

"I know. I-" He began, but Addison cut him off.

"All those times I was there, in the hospital! All those times you told me to wait in at Karen's desk, cause you and her had things to 'discuss' in your office! You were screwing her!" Addison screamed.

"Um." He began. He didn't want to admit it, but she was correct. "There's more. We have a son together. Archer. You'll really like him. He's 12."

"A brother? You waited all this time? Did mom know?"

"Yes, I knew. I just didn't want to believe it. So eventually I had my own affair. Addison, we wanted to tell you but we couldn't. Plus, we didn't want to get divorced. The money would have become a problem. We've finally reached an agreement, so we're ending the marriage." Addison's mother said.

All Montgomery's are sluts!" Addison hollered. "Even if they are a Montgomery by marriage, they are a slut. Why is that? Why can't you be faithful? You people disgust me." Addison said, opening the front door and marching to Derek's house. She knocked on the door and he promptly let her in.

"Why are you in a night gown?" He asked.

"I am in a night gown?" Addison said, looking down at herself. Apparently she had forgotten to change. "Whoops."

"It's fine. What's up?" He asked and Addison recounted the whole story.

"Holey crap and you thought your mom was bad." Derek said, pulling Addison into a hug. All of a sudden, Addison kissed Derek harder than ever. She continued kissing him passionately, and she tugged at his shirt. He quickly pushed her off.

"What the hell Addison?" Derek asked, shocked her behavior.

"What?"

"What are you doing?"

"Derek, what do you think I am doing?" She said, pulling him back into her arms, kissing his neck.

"Addison!" He yelped, pushing her off him, onto his bed.

"What's the matter?" She asked.

"Addison, I know you're upset. I know you are doing this because you want to forget about your parents, or maybe you're doing this to fit in with your parents. Either way, we are not having sex." He said. Addison became very flushed.

"Oh…Okay." She sighed. "I'm sorry. I don't really know what came over me. I-" She began then she paused. "I feel like such a slut."

"You are not a slut Addison. You are upset and you needed someone. I am here for you." He said, hugging her again.

"I am so embarrassed." She sighed and sat down on Derek's bed. "I feel like my mother."

"Stop calling Addison Montgomery a slut. She is very important to me." Derek said happily.

"I'm sorry."

"Stop saying that." He said, putting his arm around her.

"I wanted to escape for a minute. I know I'm too young, but it seemed like an escape." She sighed again, and went to Derek's door. "I'm going to go."

"No! Stay with me Addison. Just stay with me, okay?"

"Okay." Addison said. "Can we go out or something? I just don't want to sit around."

"Yeah, sure." Derek said. "How about a movie or something?"

"Sounds good. I am just going to go back to my house, considering the fact that I am still in a night gown." She said, running down Derek's stairs and shutting the door. Once she was gone, he called Mark.

"You are never going to guess what happened." Derek said once Mark picked up.

"What?"

"Addison practically threw herself at me. She wanted to have…you know."

"Seriously?" Mark asked. "What did you do?"

"I told her no." Derek said.

"WHAT? Why would you do that? Are you stupid or something?"

"It's not like I don't want you. It's not like I haven't thought about it. She was sad. I couldn't let it happen like that." Derek said.

"You're a better man than I am." Mark said. "Are you doing anything today?"

"Addison and I are seeing a movie. You can come as long as you do not mention this to her. Don't let her know I told you."

"I won't. I'll be there soon." As Mark hung up, Derek heard Addison running up his stairs.

"You get ready way too quickly to be a girl." Derek said, looking at Addison, who was totally ready for the movies.

"That's because I'm not a girl." She laughed. "And listen, I really am sorry. I still can't even believe I did that."

"Addison, really, it's fine."

"No it's not. That was a really bad thing for me to do."

"Stop it! Addison, you had a momentary mistake. Shut up about it alright?" He said with a huge smile.

"Yeah. Okay." She said happily. She knew that this wouldn't change what they had.