A/N: I couldn't resist. I've had this in my head for awhile now, and I just had the urge to type it, to make it a story. Please R & R..

Summary: Mark and Izzie try to hide their relationship. It's been over one year since our favorite interns became residents. Burke is no longer in Seattle. Christina and Alex are roommates in a two bedroom apartment (even though they still don't really get along), which is quite nice. George is at Mercy West. Callie went with George. She still has no idea about what happened with Izzie and George, which isn't important now. Derek is chief. Since Christina and Alex are roommates, leaving Meredith and Izzie to be roommates. Meredith and Derek are back to being a couple, and quite happy. The drama now is about the secrecy of Mark and Izzie's relationship.

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She was sound asleep, but started to wake up once she felt soft kisses on her neck. She smiled as her eyes slowly started to open. A strong muscular arm, an arm she knew very well was wrapped over her waist. Her head leaned against his chest. Both on their left sides.

"Morning." A very awake Mark Sloan whispered in her ear. They have been dating for five months, and two months before that, they became very close friends. It started it all between them. No one even knows they get along, none-the-less go out, or friends, or even friendly acquaintances.

"Morning." Izzie said tilting her head to back to the side to get a morning kiss. They shared a soft, gentle kiss. Things have been going well. Not just in the relationship in general, but life in general in Seattle Grace. Izzie looked at the clock and frowned. "I have to go before Meredith or Derek wake up." She sighed. Izzie was in the mood to be with him. It was her day off after all, and it was also his. Damn secrecy.

Mark kissed the back of her neck by her ear. "I wish you would stay." His feelings for her grew more and more each day. They got together because of their feelings for each other after all. Meaning, they admitted they both loved each other.

Izzie smiled. The warm kisses he was placing on the back of her neck were soft and sweet. She enjoyed the feeling. "Me too, but I have to go back into the house before Derek goes into Meredith's room, causing him to see, and/or hear me, come in." Izzie said sleepily and very much disappointed that she had to leave his grasp. She slowly slid out of his grasp and swung her legs over the side of his bed. She was at Mark's two bedroom penthouse, which she helped him pick out, he officially worked and lived in Seattle. It was a very nice place, and an especially nice kitchen.

While Isobel was putting on her clothes, Mark watched her, smiling to himself about how lucky he was to have her. Everything about her, he loved, inside and out.

Once Izzie finished putting her clothes in. She leaned over to where Mark was, and just before she kissed him good-bye until they saw each other again, she smiled and said, "I love you." They shared a slow, gentle, sweet kiss.

"I love you too." He said once the kiss parted.

Izzie smiled at Mark one last time before leaving to head back to her and Meredith's house.

She drove to the house, hoping that Derek was still asleep. She walked up to the door and opened it. She quietly turned the doorknob and entered the house. She as quietly as she could closed the door. Izzie sighed, relieved that she hadn't heard anyone wake up. She walked more into the house smiling to herself about to walk up the stairs when she heard someone call her name.

"Izzie!"

Crap! Izzie thought turning so she was facing Derek who was now walking out of the living room. "Umm, morning Derek." She said smiling nervously.

Derek looked at what she was wearing. "Where did you go?" He asked curious to know the answer. She was wearing a black skirt that flows just above the knee, silver high heels, and a beautiful white blouse, it was from the dinner she had with Mark yesterday at this new Italian place not to far from where he lived. She was holding a small black purse in her right hand. Her hair was in very messy curls.

Izzie couldn't find the right words to say. She glanced at what she was wearing, then back up at Derek. "I…Umm, went to take a walk!" She said stuttering at first, but then eased in to what she was saying.

Derek nodded not believing a word of it. "Uh-huh, sure." He looked at her one more time confused about where she was, but he wasn't going to question anything. He moved past her to walk up the stairs to Meredith's room.

Izzie watched Derek go upstairs, and once she couldn't see him, she started to walk up the stairs herself to her room. She decided she would take an early morning start, so she went into her room and grabbed some casual clothes to change into and walked into the bathroom and closed the door behind her.

Derek walked into Meredith's room where Meredith was slowly waking up. "Where were you?" She asked sleepily to Derek's figure that was walking towards her.

Derek had to make up an excuse so she doesn't kick him out permanently from her room, meaning no sex. "I just went to the bathroom." She only nodded in response. "I saw Izzie coming in, and she was dressed pretty nice. She told me that she went for a walk." He said in a tone that said that he wasn't believing her for a second. He sat down on the bed next to Meredith.

Meredith looked at Derek curiously. "Seriously?" The only thing she could think of is that she went on a date and had sex with the guy, but that couldn't be it, she would know, wouldn't she?

Derek nodded. "Seriously. Did she have a date of something last night?" He asked curiously. Over the time that he and Meredith officially patched things up, Izzie and him talked, usually when he would try to sleep on the couch, most of the times he forgets his earplugs. They had become pretty good friends.

Meredith shrugged. "Not that I know of." She thought for a moment. "I think she might be seeing someone, but she would of told me…I think." Meredith thought for another moment. Who could she date? No, she couldn't be dating someone, she would of known…She would've, unless Izzie's not telling her for some odd reason. She couldn't think why though.

Derek shrugged and said with a joking smirk. "She would've…Maybe it's Mark."

They both shared glances and began laughing.

"Yeah right, she hates him!" Meredith said still laughing a little. Little does she actually know.

Derek chuckled. "Yeah, she does." Him and Mark have gotten their friendship back on track for awhile now, and for that Mark, and surprisingly Derek are both glad.

Meredith sighed sleepily and looked at Derek. "I want coffee." She didn't feel like laughing anymore, to tired.

Derek chuckled and stood up, holding his hand out for her to take.

Meredith happily obliged and took his hand and stood up. They both smiled at each other, Meredith with a tired smile though, but a smile none-the-less. Both made their way down to the kitchen, seeing a very cheerful Izzie, casually clothed and already ready to go to work. She was pouring herself some coffee into a mug.

Izzie finished pouring herself a cup of coffee and looked at Meredith and Derek and smiled. "Morning!" She was usually perky, at least for these last, I don't know, five, six, seven months, so they were used to it.

"Morning Iz." Meredith said tired to her cheerful friend while taking a seat by the counter. Derek sitting on the chair next to her. "Derek told me that you came in this morning looking pretty nice." She said casually.

Izzie glanced up at Meredith nervously and gave her a nervous smile putting her cup of coffee down. "Yeah, I took a walk." She said unconvincingly. Izzie grabbed two mugs out of the cabinet and put them on the counter. She poured coffee into the two mugs for Meredith and Derek.

Meredith nodded her head unconvinced. "Did you have a date last night Iz?" She asked curiously and suspiciously.

Izzie handed Meredith and Derek their mugs of coffee which they gratefully took. "No, no, no, why would you think that?" She asked nervously stuttering.

Meredith shrugged taking a sip of her coffee. "No reason, just thought you had a hot date and slept with the guy at his place and tried to sneak back in, that's all." She said innocently.

"With Mark." Derek said sipping his coffee jokingly.

Izzie was sipping her coffee, but when she heard what Derek said, she was about to spit her drink everywhere from her mouth when she covered her mouth with one of her hands and holding her mug with her coffee in it with the other.

Derek chuckled at her reaction. "I was only kidding, don't worry." He said chuckling again.

Izzie laughed nervously. This was going to be a long day.