The Elven King’s Forever by Devon Vesper

Can two enemies work together to save the one person they both love?

After all this time, Dustin’s transformation is nearly complete, and his happy ending is so close he can almost see it. His wedding is fast approaching, and he’s about to start school. He has his future, his lover, and his friends, and he at last believes that he can truly have it all.
Meanwhile, their old nemesis lurks in the shadows, ready to destroy any happiness Casersis might have. They knew Bradley is dangerous, but no one is prepared when he makes his move and kidnaps Dustin.
In order to rescue Dustin, Casersis must work with his old adversary, Erastus. They both love the almost-elf in very different ways, and if they can’t set aside thousands of years of hate, it’s Dustin who will pay the ultimate price.