summer fling!au. Niall and Zayn meet at one of Harry's parties, where everyone is excited to move on to the next chapter of their lives. Everyone except them. Drunk and out of their depth, they hook up. They keep hooking up, and attempt to start a casual relationship, only Zayn's definitely falling, and Niall's trying to ignore the fact that he is, too.
Harry, Liam, Zayn, and Louis are a family of vampires. In this universe soulmates are clearly in existence. People are drawn together, so to speak.