Principal Skinner announces that Mrs. Krabappel was called out of town and budget cuts dictate that, until she returns, the schools two fourth grade classes will merge. Bart reluctantly shares a desk with Nikki and develops a flirtatious rapport. Bart talks to Grampa about his new crush, and at Grampas suggestion, gives Nikki a kiss. But when Nikki starts sending Bart mixed signals, he swears off women forever. Meanwhile, Lisas classmates ostracize her for being an overachiever, and First Lady Michelle Obama, a self-professed nerd, comes to Lisas defence.