Russell develops an attraction to his pretty teacher, Leslie Stevens. Kirk tries to tell him to be realistic, but when Leslie asks Kirk out to lunch, Russell gets jealous. Russell gets Elizabeth to take him to the same restaurant as Kirk and Leslie, so Kirk will be jealous of him. Kirk frantically tries to explain the situation to Leslie and Elizabeth, but the women pity Russell and tell Kirk to leave. Meanwhile, after Corey gambles and loses several possessions in a one-on-one basketball game with an expert player, Zack, former junior high school basketball star Phoebe wins everything back for Corey with a few trick shots. Also, Eddie earns money by taking an experimental drug until his face turns fluorescent orange.

Kirk sets Russell straight when the tyke things he got a girl pregnant just by kissing here, but Kirk's unprepared for the parenting rite of passage when Russ asks where babies come from. When Russell asks Kirk where babies come from, Kirk is reluctant to teach him about sex. Nervous, Kirk makes up an outrageous story to explain it, telling him that babies come from rainbows. Later, Russell gets beaten up at school for repeating the story. Finally, Kirk tries to tell Russell the truth, but Russell is no longer interested. Meanwhile, Phoebe tricks Eddie and makes him appear foolish while he's on a date. In order to get revenge, Eddie tries to help Corey annoy Phoebe by entering a better project than Phoebe at a science fair.