The last omega will save us

In this post apocalypse AU Alec is the last omega in the world and the only person left who can become pregnant. But with the help of his family and boyfriend Magnus, Alec has kept this a secret. Alec and Magnus have been dating for a year, but Alec's ex boyfriend Jonathan has been trying to make him get back together with him. Jonathan is furious that Alec won't resume their relationship and out of spite Jonathan tells the world Alec's secret forcing him to go on the run.

Magnus will do anything to protect his omega so goes on the run with Alec. But being on the run is harder than he thought it would be and it puts a strain on their relationship.