This is episode 50 of 56 of My Secret Vampire Protector. Play it below, then continue straight into the next episode — the whole season is free and needs no account.
The closing stretch of the season, where the arc pays off.
Vampire Damon has secretly protected Nancy for ten years. Her fiancé Wayne conspires with Fiona to steal her designs. Damon saves Nancy at the engagement party, and she discovers Wayne's betrayal. Wayne exposes Damon's identity, forcing them apart, but they reunite three years later.