Barney: I have to get Robin. Don also has twin beds. Don: But if Robin decides to move, I bought a giant bed. Flashback
Lily: Twin beds? Let her. Lily and Marshall are sleeping in their beds each. Marshall and Lily arrive. She is mine! Ted and Barney are at the apartment. That's how it starts!
Plan: A: Robin's new relationship; Q: What do Ted and Barney jeopardize? A: Robin; Q: Who realizes that she is finally over Ted and Barney? A: a weekend; Q: How long did Marshall and Lily spend sleeping in twin beds? A: Marshall; Q: Who and Lily decide to get twin beds at home? Summary: When Ted and Barney jeopardize Robin's new relationship by professing their love for her, Robin realizes that she is finally over them. Meanwhile, after spending a weekend sleeping in twin beds, Marshall and Lily decide to get twin beds at home.