Amy: Oh. Bernadette: That's it? But Priya is highly educated, she's an accomplished professional, and she comes from the culture that literally wrote the book on neat ways to have s*x. He had a fight with his mother. His sister is staying with him. Leonard: Penny, this is Raj's sister, Priya. Penny: How about Howard? Priya: Get out of the way. Sheldon: Actually, he can. So, what is all that stuff? Then we just stick her in the ground, flip her mattress and move into the big bedroom. To give your mother herpes?
Plan: A: Leonard; Q: Who does Priya resume dating? A: Raj's protests; Q: What is Priya ignoring when she returns to Leonard? A: Amy; Q: Who gets Penny to admit that she is jealous of Priya? A: the brainwaves; Q: What does Amy measure to see if she can measure jealousy? A: Bernadette; Q: Who insists that Howard leave his mother and move in with her? Summary: Priya returns and resumes dating Leonard, despite Raj's protests. Amy gets Penny to admit that she is extremely jealous of Priya, giving her the chance to measure the brainwaves associated with jealousy. Meanwhile, Bernadette insists that Howard leave his mother and move in with her. He eventually does so, but tells her a sad story about how much his mother depends on him. She then agrees that he can move back.