Disclaimer: I don't own Grey's Anatomy. I kind of only half own Tara, who is based on the character of the same name from Buffy: The Vampire Slayer.
A little while later, Addison went off to reprimand Charlotte for unnecessarily raising her voice in front of the children, leaving the still whimpering Lexie under the protective eyes of Meredith and Derek, whom she had so far judged to be the most responsible members of the young group. Mark was watching over her too, concerned. Usually he would have run off to play again like the other children had done by now, but little Lexie Grey stirred feelings in the young Mark Sloan that he would not normally have had at that age.
"Are you sure she's gonna be okay?" he asked, frowning.
"Yeah, it's just a little bump" said Meredith, holding the ice-pack to the younger girl's forehead. "You're gonna be fine, aren't you Lexie?" Lexie, who was sucking her thumb, just nodded in reply.
"Hey Mark!" Alex called, as he, Owen, and Cristina ran over. "You still wanna play army men?"
"Cristina's gonna be the hostage now, and I'm gonna be the one who has to rescue her" said Owen proudly.
"I don't need anyone to rescue me" Cristina frowned, crossing her arms. "I'm gonna be escaping, and you're gonna be my backup."
"Okay" Owen shrugged. "I guess that's good too."
"I'll be there in a minute guys" said Mark, turning back to the others. "Are you really sure Lexie's.."
"She's fine, Mark" said Derek.
"Okay" Mark frowned, walking off. "But I'll be back, and if she's not.."
"She's fine, Mark" Little Derek repeated, rolling his eyes as his friend went to play, before turning to Meredith. "Gee, I've never seen him so worried about another kid before." Aside from Lexie's occasional whimpers, they remained quiet for a while, but it was a reasonably comfortable silence.
"Um, Derek?" asked Meredith suddenly.
"Yeah?" said Derek.
"How are we really sure Lexie's gonna be okay?"
"Well, I'm pretty sure" said Derek, frowning as he began to think. "The only bad thing that could happen is if she got concussim.."
"Concussim?" Lexie yelped, clinging to Meredith.
"What's concussim?" asked Meredith, confused.
"I don't really know" said Derek with a shrug. "But my big sister Nancy said my little sister Amelia probably had it this one time when she ran into the wall."
"I don't wanna have concussim!" Lexie wailed.
"Don't worry" said Meredith, comforting the younger girl. "Doctor Montgummybear didn't say anything about it."
"I don't think that's her name" Derek frowned.
"I know, but it sounds kinda like it, and I couldn't think of the real one" Meredith explained.
"Okay then" said Derek, shrugging again.
"Do you really got a big sister and a little sister?" asked Lexie, forgetting her worries from a few moments before.
"Three big sisters" Derek clarified. "One little. Do you guys have any brothers or sisters?"
"No" said Meredith, shaking her head.
"Me neither" said Lexie, "But I'm probably gonna get one soon, 'cause I heard my Mommy and Daddy say they were trying to get one. But I'm always gonna be the olderest now, so I'll never have any big brothers or sisters. But if I did have a big sister.." she turned shyly to Meredith, "I think I'd want her to be just like you!"
"Really?" Meredith smiled. "Well then, if I ever have a little sister, I'd want her to be just like you!" she tickled Lexie, making them both giggle.
"Why don't you guys pretend to be sisters while we're here?" Derek suggested. "You already have the same last name anyway. Lexie can find out what it's like to have a big sister since she's never gonna get one, and Meredith, you can practice being a big sister in case you ever get a little sister."
"Yeah!" said Lexie excitedly.
"That's a great idea!" Meredith agreed enthusiastically.