That Time Derek and Stiles Had to Get Gay Werewolf Faerie Married, and Lived to Tell About it (not that they will)

To build an alliance with the fae, Derek has to prove he's willing to make a commitment. And that he's capable of satisfying the party he commits to.

Fae marriages don't always take the same way other marriages do anyway, so it's totally fine. Derek can get this over with and then pretend it never happened.

Except the faeries want him to marry Stiles.