As NCIS returns for its 21th season, fans may witness a twist in the budding romance between Jimmy Palmer and Jessica Knight. The potential breakup stems from a rule violation – dating a coworker, a rule set by former team leader Jethro Gibbs. Although Gibbs has resigned, the couple may still face consequences as new leader Alden Parker may have a different stance. Fans will have to wait to see if Jimmy and Jessica choose to adhere to the rule or challenge it, impacting their relationship and roles within the team.