With Leonard now dating Stephanie, Sheldon's hypochondria kicks into high gear. Instead of ensuring Leonard's relationship with her is maintained, Sheldon now takes advantage of it by asking Stephanie to do a plethora of tests and examinations on him to figure out what ails him. Sheldon doesn't feel the need to ensure the maintenance of the relationship since Stephanie has moved in. Sheldon's assertion of Stephanie's living status is news to Leonard, who doesn't believe she has indeed moved in. They get an objective third opinion: Penny too believes Stephanie has moved in. When Leonard finally comes to the realization that Stephanie has moved in, he asks Penny for advice on how to slow it down without ending the relationship.