A/N- Ok, I don't know if you guys didn't like it, or if your lazy. But, LexieMcSteamy reviewed (as always) and I really appreciated what she said. And, she said she really like how Mark said girlfriend wasn't enough for Lexie and too much for Julia. I've always felt that way. Just like when Meredith was drowning and the man in the waiting room asked who she was. Derek's answer was 'She's my girlfriend' it doesn't sound right. Not after everything they'd been through. So, Ladies and Gentlemen, the next chapter.

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"Somebody's home late" teased Meredith in a singsong voice as she heard her sister's keys in the door. Lexie walked in and it took everything she had in her not to break down and cry. As she walked past the doorway of the living room, Meredith shot up from the couch and darted to her sister's side. All she was wearing was a long sleeved dress shirt, but it was unbuttoned. Meredith examined it closer, and soon realized there were no buttons to button.

"Lex? What happened to you?" She asked, concerned. All Lexie did was cry. "Let's get you cleaned up okay?" Said Meredith, taking her sisters hand."Derek!" Yelled Meredith, "we need help!"

Derek came running down the stairs. "What the hell happened?" He asked, stopping at the landing.

"I don't know, but we need to get her in the tub." She said, and he walked up to his little sister, grabbing her waist and carrying her up the stairs.

Once they had reached the master bathroom, they sat Lexie down on the floor.

"Derek, grab some towels." Said Meredith, sitting in front of Lexie. "And run the bath."

Meredith slowly removed the dress shirt from her sister and slightly gasped. She had bruises covering her back, dry sweat caked on her hairline, bite marks all over her body and a few large hickeys on her neck. As she placed Lexie in the warm water, she slowly walked into her bedroom. Derek was sitting on the bed, holding the dress shirt in his hands.

"This is Mark's." he said, running he's fingers over the torn fabric. "Was Mark's"

"It can't be his, you should have seen it Derek, she had bite marks and Bruises and it was bad."

"Mer, this is his shirt, I'm sure of it."

"Derek, it isn't his shirt, he couldn't have done that to her."

"Meredith, it's his shirt. And Mark and Lexie hadn't been together in years, the sex was probably hard and fast. They both lost control. I've gotta go over there, because if she's here, with us that means she isn't there with him, and that's where he wants her to be"

… … …

"Sloan!" Yelled Derek, pounding on the door. "Open the damn door!" It swung open, revealing Mark, who looked like he'd been hit by a car. His lip was cracked, and his face was sweaty and covered in uneven stubble. He was shirtless so Derek could see the scratches and bite marks, covering his torso.

"Please help me," said Mark, turning around and walking inside the apartment. The scratch marks were even worse on his back, covering almost the entire surface and some looked as if they had bled. As soon as he was out of the door way, Derek walked into his apartment.

"Holy Hell," he said, looking down at the ruins that were Marks home. The broken glass, the scattered paper, the stains on the carpet, the Lexie sized dent in the wall, the cracked picture frames, the nail marks on the kitchen table and the demolished coffee table.

"Holy Hell," he repeated taking in all that was before him.

"I didn't know where to start." Said Mark, glancing around the room.

"Take a shower" said Derek, picking up Lexie's panties off the floor. "Then you can start by explaining."

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As Mark walked out of the bathroom, he saw that Derek had managed to clean up most of the broken glass and had piled the mail on the counter. He heard the washer running and suspected that it was the majority of his and Lexie's clothes, apart from what had been ruined. There was a pizza sitting on the table. As Derek saw Mark's glance go directly to the table, he chuckled.

"Don't worry, I sanitized it, but I couldn't get the scratches."

He silently sat down at the kitchen table, but after a few moments, he shot up.

"I'm gonna need a new table." He said, snatching the pizza box up and placing it in front of Derek on the island.

"You're gonna need two new tables, a new carpet, a hell of a lot of new dishes and a new wall," said Derek. "Care to explain?" Mark raised an eyebrow.

"You don't want to hear this."

"Ah, but I do. First, I need to know why my little sister is battered and bruised, second, I need to reports something back to my wife and she'll have a bunch of questions, and third, I'm honestly very curious as to how this all happened. And I want all the dirty details. The better my report is the better reward."

"Ok, fine, so, I was thinking about Lexie, right? And then she showed up. I think she was trying to mimic that first night, so she took off her clothes. All of her clothes"

"What first night?" Asked Derek raising an eyebrow.

"You don't know?" He asked incredulously.

"What happened?" He asked

"You know, when she stripped in my hotel room and said 'Teach Me'?"

"She did what?!" He yelled.

"Yeah, so any way, back to last night, so after we were uh, free, of our clothes I kinda um, slammed her into the wall."

"Wow, classy." Derek deadpanned.

"No judging. Because that isn't the worst of it."

"Fine," sighed Derek, "But did you ever consider the fact that it could've given her a concussion?"

"I'm not a neuro surgeon, I'm a plastic surgeon. So while you're thinking about brains during sex, I'm thinking about asses and boobs."

"So, the slamming into the wall is what caused the Bruises, the dent and the destroyed pictures."

"Yeah," confirmed Mark," So, after the hard wall sex, we found are way to the floor, which is the cause of the stains. But the floor was uncomfortable, so we moved to the coffee table. Turns out, that it couldn't hold the weight of the two of us, and it collapsed. So," he said ignoring the look on Derek's face, "We made our way to the kitchen table and we needed space so the dishes broke. And by that point, I was touring her, which is where most of the scratch marks came from. And the bite marks."

"The ones on the table or the ones on your back?"

"Table. The ones on my back came from her orgasm. I bit her ear, and she completely lost it. And then I did other stuff with my mouth and um, well, let's just say I don't think she'll ever be the same."

"Ok, TMI." He said holding up a hand when there was a knock on the door. "I got it." He said, standing up and opening the door.

"Where's Mark?" Asked Callie.

"He's in the Kitchen. But you don't want to go in-" started Derek before Callie pushed past him. "There." Sighed Derek.

"What the hell do you think you were doing last night?!" She yelled slamming her fist on the table.

"What does it look like I was doing?" He said gesturing the demolished apartment.

"All I know is that is the single loudest thing I have ever heard in my life. Not even just the various thuds. The ear splitting screams and the Moans that sounded like a train! It sounded like you were like torturing her. It sounded like it hurt." Derek began to laugh.

"They were really that loud?"

"Derek, you saw her, you saw me and you saw the apartment. Do I really need to answer that question?"

"You saw Julia?" Asked Callie, a confused look on her face. Both Derek's and Mark's face went completely white.

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