Tails and Cosmo (spoilers)

In order to stop Dark Oak, Tails is reluctantly forced to fire on him while he's being suppressed by Cosmo, even though the blast would destroy her as well. Just before pulling the trigger, Tails yells out how he feels about Cosmo, and in her final moments, her spirit reaches out to his as they say farewell and remember everything they'd been through together, with Cosmo's final words to Tails being that she loves him as well.

Example of:
Star-Crossed Lovers