When Martin Prince's birthday party bombs due to food poisoning, Principal Skinner and Mrs. Krabappel hide out in the kiddie playhouse and fall for each other. However, Bart sees them making out and promises to keep quiet in exchange for having his permanent record switched with Milhouse's, but how long can the lovebirds keep Bart from singing to others about their affair?
Full Story[]
After a long length of morning announcements Mrs. Krabappel has to use fire crackers to wake everyone up. Afterwards Martin invites his classmates to his birthday party, but no one seems interested. On the day of the party Bart and Milhouse are playing in the Simpsons yard and the two decide to go even though they would lose popularity points. The gathering turns out to be incredibly boring. There is a bouncy house and pony rides but there is also a math magician (who doesn't know that 7 goes into 28 4 times). In the meantime, Principal Seymour Skinner and Edna Krabappel attend and have a conversation which leads to them discovering that they have romantic feelings for each other. When Agnes spies on Skinner for playing in the neighbors yard he claims that he was invited to the party, after a pause Agnes comes over, prompting the two to hide in the playhouse. Meanwhile to cap off the poorly received party, the celebration goes south when almost everyone becomes ill with food poisoning that was caused by serving diseased oysters instead of cake (which Martin's Dad was against). Martin however is only upset about his reputation instead of the sick guests and Nelson punches Martin before falling ill himself. After the ambulances arrive to see to the sick kids, both of the Simpson kids managed to escape the poisoning: Bart gave his oysters to the cat, Lisa didn't eat hers either because of her vegetarian diet, but she feigned sickness so that she could leave with an excuse. The two adults who are unaware of the events that occurred end up kissing in Martin's pink playhouse, an act witnessed by Bart.
Bart plans to reveal what he witnessed to some kids in the cafeteria at school, but Seymour and Edna fear that they would be fired if anyone found out and they swear him to secrecy. They hire him as their gofer, so they can secretly exchange messages. Bart agrees for a while, because the reward for his cooperation is that Milhouse Van Houten will inherit Bart's poor school record. While the happy couple continues to grow closer and happier, Bart still has a job to do. Eventually, Bart grows frustrated about his home, school and social life continually being interrupted to help them advance their relationship, putting him in embarrassing situations including getting him out of bed at night to see a movie despite being exhausted, to make matters worse Superintendent Chalmers becomes suspicious. One afternoon at school, after he is embarrassed in front of his classmates by having to say one of Seymour's messages to Edna out loud, Bart becomes so furious after getting ridiculed by his friends and he bitterly responds by gathering the entire school in front of the janitor's closet and opens the door to reveal that Seymour and Edna are kissing each other.
Word quickly spreads throughout Springfield, with the story growing more illicit and exaggerated with each passing turn. An appalled Chief Wiggum, upon hearing his son Ralph's version of the events, alerts Superintendent Gary Chalmers. Chalmers tells Seymour that the whole town's in an uproar about his sleazy shenanigans and gives Seymour a choice: to either end the relationship or have the both of them face dismissal so fast that his mortarboards will spin. Seymour chooses that love is stronger than his professional goals, so Chalmers fires him and Edna, expecting them to leave the building by 3:00.
Bart learns that the couple have lost their jobs and shows remorse for them. After Seymour apologizes to Bart for humiliating him, Bart encourages the former principal to stand up for himself. Seymour and Edna lock down the school, call the media and make their demands: They want their jobs back and the townspeople to not interfere with their relationship. However, several residents (specifically Maude Flanders) rebuke with the accusation about the two having sexual intercourse in the janitor's closet. Seymour insists nothing of the sort happened and that he is a virgin. Everyone accepts the explanation, since no one would ever give false information about being a 44 year old virgin. Chalmers agrees to reinstate Seymour and Edna as though nothing ever happened. The couple choose to continue their relationship more privately than ever by convincing Bart that they have broken up after thanking him for helping them. However, in the last scene of the episode, they have sex in the janitor's closet.