Previously on Grey's Anatomy: Mere decides to be celibate, then meets Hot Vet Chris O'Donnell; Bailey is covered in mommy; Izzie falls for Magical Heart Patient Denny; George and Burke bond and play jazz instruments together and whatnot; and George discovers that Callie lives in the hospital basement. And also, it's been like a month! What gives, ABC?

We open in the hospital corridor just outside Callie's lair. Mere voice-overs, "The key to being a successful intern is what we give up: sleep, friends, a normal life. We sacrifice it all for that one amazing moment -- the moment when you can legally call yourself a surgeon." George and Callie are having an amazing moment of their own...in bed. George's haircut appears to have been a success; he looks less like a retarded monkey and more like an actual person. Callie thanks George for the good hot sex, and we cut to...

…Addison and McDreamy in bed, as well. Addison barks, "Thanks," and makes a pained face. MereVO: "There are days that make the sacrifices seem worthwhile." McDreamy and Addison giggle at the ridiculousness of their very bad sex. McDreamy: "You're thanking me for the most boring sex ever?" Hee. Addie says she didn't know what else to say. They commend one another for doing "their best," and as they go to hug, bang heads. Ow! An appropriate ending for this round of love-making, I'd say. Luckily, McDreamy's phone rings, and he tells the person on the other end of the line that he can pick up Doc this morning. Addie grabs the phone. "Dr. Dandridge? We're going to have to call you back. We're trying really hard to have some decent sex here!" Except, it's not Dr. Dandridge on the phone! It's Meredith! Oh, GOD. Mere hangs up her phone slowly, and voice-overs, "And then there are days where everything feels like a sacrifice."

Hot, hot, hot Chris O'Donnell walks Doc into the waiting room of his office and asks Meredith if everything's okay. First of all, when did Chris O'Donnell get fabulous? He's so...mousy! And secondly, keep it up, McVet. Keep it up. Mere says everything's fine, and tells Doc he looks good. McVet says it may be just a virus, and the dog can go home today. He then changes the subject: "So you and Derek...are you together?" Mere stutters that they're just friends, and she? Well, she is knitting a sweater. She rambles on some more until McVet interrupts, "So you're single." He's asking because he wants Mere to go out with him. Mere: "Out. With you." McVet: "On a date. Tonight." Mere, adorably: "Date. Tonight." McVet assumes that she's repeating everything he says so she can stall and figure out a way to let him down easy. Mere tries to make him feel better while also telling him she's just not dating at this time. She is welcome to send his previously-mousy self over this way, and go on about her knitting.