Not With My Sister, You Don't

S1 E23: Tall, handsome Lester Braduck transfers to Keith and Laurie's high school, and within two weeks, he has taken out half the girls. Keith and the other boys are having fits. Meanwhile, Laurie comes home very excited one day and announces that Lester has asked her out. Keith tells Shirley about Lester's Don reputation at school, but Shirley replies that the rumors could be false. Besides, she has enough trust in her daughter...but Shirley talks to Laurie anyway. Laurie assures her that Lester is very shy and the girls are annoying him. Keith goes up to Lester at school and introduces himself. He asks if Lester would like to double with him and a girl when he takes Laurie out. Lester says yes, but when he hears which girls Keith plans to invite, he refuses because he has already taken them out. Laurie goes on the date, and Keith and Danny follow in the bus. When Lester and Laurie are sitting in his parked car talking, Danny panics that something is going on and he goes up to the car, knocks on the window and and asks for a match. Needless to say, Laurie is humiliated and furious. She refuses to talk to Keith and Danny, and they feel rotten. Lester also refuses to talk to Keith, so he can't even make amends. Danny makes matters worse by repeating his act when Lester is parked with another girl. Keith finally manages to apologize to Lester and gives him a ticket to the Partridge Family concert so that he can take Laurie out afterward. Laurie is delighted...until she discovers that Lester is not the shy boy he seemed to be. She ends up walking home after twisting Lesters's arm as she fights him off. Poor Keith gets the blame again for fixing them up. He then meets a beautiful girl at school but can't ask her out. She is Lester's sister.