Last Born of Elvinwood — Linda Haldeman

An enchanted banquet deep in the forest

Two surprise guests appear at a fairy feast one cold, rainy night: Oberon, the noble King of Fairies, and Ian James, one of the human kind, an actor who had picked up a chestnut
--and vanished into their utterly charming, sometimes exasperating world.

Ian's blunder almost costs him his life, but Oberon spares him in return for a sacred pledge to save their dwindling race by finding a willing mortal bride for the last fairy prince.

The daring scheme calls for the magic of the oldest and most powerful wizard of them all--and for a fairy to enter the perilous world of man.

Mompen, the lastborn of Elvinwood, bravely volunteers.