Nick Freno: Licensed Teacher (1996) : 1x12

Despite sharing their first kiss, Nick and Elana decide not to date since they work so closely together. Then an attractive student teacher Heather Kellogg is assigned to Elana's class, and Nick asks Heather on a date. When Elana gives Heather a poor review, Nick assumes that it was because Elana is petty and jealous, and they argue. But when Heather is reassigned to Nick's class, he finds out that she is incompetent and deserved the bad recommendation. He apologizes to Elana. Meanwhile, during a class assignment they work on together, Tyler and Sarah become attracted. They kiss in private. However, they revert back to their usual adversarial relationship after the other students inadvertently find out and tease them.