Set in modern times. Character A and Character B were teenage sweethearts and each other's first. They even got engaged. But Character A had a terrible secret (e.g. they are a vampire/werewolf/spy/assassin/shadow hunter/mage etc), which meant Character A having to leave town to protect Character B's life. Five years later, Character B had no choice but to move on, though it took a long time. Character B has a full time job, they study part time, they even have a semi-serious relationship. Then one night as Character B is locking up after work, Character A shows up out of the blue because B is in danger. Will they rekindle their long lost love or will Character B fight their feelings for A? All they know is, they will always be their first.