Meredith‘s one night stand has an erection that just won’t quit. Izzie catches Alex in the act with Olivia. Cristina gets keyed by Burke. Quintuplets arrive at Seattle Grace.
Meredith phones Cristina and says “There’s a boy in my bed.” Cristina is snooping around at Burke’s. She’s horrified that he’s so clean and organized. Oops, Mer’s boy wakes up. She tells him she’s going to shower and when she gets back, he won’t be there. Remember the last time she said that to a boy?
Cristina finds a key on Burke’s counter with a note—he had the key made for her. We think it’s cute. She doesn’t. She has that “oh crap” look on her face. When she confronts Burke about the key, he tells her, “You can start thinking about moving in with me.”