Skye Alcotte and Ace Fillmore are the first proper 'couple' to appear in A Battle Of Blood (they get together in mid series one).
Skye and Ace had been best friends since Skye was changed (by Ace) in 1903. However, in 2012 they realise that there's something else there and they end up getting together. They have to keep it from Tee - Ace's sister - in case she disagrees with their decision, though when Skye and Ace run away from the Azure Bloods, Skye leaves her a note explaining everything. When they come back a few weeks later, Tee accepts their relationship.