The Beasts Substitute Bride

For over a hundred years, the human town has provided the next mate for the reigning beasts and this year, a bride is required.
Paisley and Nevaeh are from the family mandated to provide the next bride for the reigning beast. Nevaeh has been selected as the eldest daughter while Paisley is engaged to a man she loves.
What happens when Nevaeh runs away the night before her collection and Paisley is asked to go in place of her sister to be the bride of the beast.