While at school, Martin invites the class to his birthday party. Edna Krabappel and Seymour Skinner show up and so do Bart, Lisa and many others. As one of the dishes Mrs. Prince serves oysters. When Seymour spots his mother trying to enter the party he and Edna go and flirt in Martin's teahouse. Everyone but Bart, Edna and Seymour leave the party sick because of the oysters. Bart stays a while and sees Edna and Seymour kissing. At school they overhear Bart about to tell Milhouse, Lewis and gang about what he saw, so Krabappel and Skinner take Bart into the principal's office. They make an excuse which fails, and bribe Bart by saying they will clear his permanent record if he keeps quiet. Then they start using him as their messenger, by pulling/sending him out of class to send messages to each other. It works for a while until they go a little too far. Bart tells everyone and proves it by opening the janitor's closet to reveal Krabappel and Skinner kissing. Rumors go from parent to parent about them having sexual relations. Superintendent Chalmers fires Krabappel and Skinner, but Bart tells them that they should demand to stay employed. Krabappel and Skinner lock the school and a mob watches as they demand their love be respected. Maude Flanders tells why they are upset, and Seymour reveals himself to be a virgin, satisfying everyone. Their relationship is legal, and Bart is out of the picture.