House sees Stacy. He explains that the patient he assaulted actually hit him first, and Stacy's all concern, examining House's jaw for injuries. Aside from the usual stubble-related ingrown hairs, House's jaw seems fine. Stacy dabs some ice on it as House starts asking about Mark. Either Mark knows that Stacy is smoking and hasn't said anything about it, or Mark and Stacy haven't been close enough for Mark to smell the cigarette smoke on her in a very long time. "We're fine," Stacy says. But House presses on. He insists that Stacy is lying about the sex. He knows her well enough to know when Stacy isn't getting any. "You can smell that on me, too?" Stacy asks. Ew. Ew. Ew. Stacy says that the only people who know what's going on with her and Mark are her and Mark...and her therapist. Who works at PPTH. "You could easily get into her office. You read my file," Stacy realizes. Hey, Stacy -- if you knew about that first part, why the hell didn't you realize the possibility of the second part? Come on! House knows he's busted, and doesn't say anything. Stacy tearfully realizes that House's recent kindness to her was all a result of the stuff he read in her file, and his trying to use it to manipulate her. House points out that Stacy didn't have to keep spending all that time with House, but she did because she wants to be with him. "I don't anymore," Stacy says. And then she kicks him out of her office. And House can't really say much to that.
A guitar plays the beginning to our episode-ending music montage. Kalvin sits at his father's bedside and apologizes. Cameron watches them. Dude, Cameron, MYOB.
Stacy and Mark cuddle on a couch. Mark wonders why Stacy smells like cigarettes and rat piss, and makes a mental note to buy a washing machine along with the dishwasher.
Chase washes his face and notices something on his lip. It looks like a Cameron-shaped bite mark. Rowrr, Cameron! Have fun hoping you don't have AIDS, Chase! Try not to do some illegal drugs during your own personal struggle dealing with your mortality, which will take place off-camera.
Cameron takes her pills and crosses out the days on her calendar until her next AIDS test. Maybe when that's negative she'll start wearing makeup again.
House hangs out at home, all alone except for his new pet rat.