This Could Be Fun (Jelsa)

Elsa is perfectly content on not finding love. But when a boy named Jack gets her number by accident, he decides calling her will be more like a game.

The Fallen Angel; Jelsa Fanfic

Elsa is an angel and she keeps causing trouble in heaven. The Angel Council decides not to tolerate her behavior anymore and they banish her into hell where she has to serve the handsome, demanding and arrogant Demon Prince, Jack Blaze (Jack Frost).