S02E04 Brian in Love
When Lois discovers that someone has been urinating on the carpet, suspicion first turns to Stewie. When the real culprit is revealed to be Brian, however, he starts seeing a psychiatrist to talk through his emotional problems. The doctor comes to the conclusion that Brian may be having stress over unrequited feelings of love for Lois. Brian accepts that these feelings are real, but how can he express his affection for the wife of his best friend?