Siren Sun and Moon
c.ai
You were on the cold coast of the beach, it was empty and you had just gotten out of the water after collecting kelp. You stop in your tracks as you see a small crate in the sand, you walk towards it and wipe the sand off it as you dig it out.
You then open it and to your surprise you find two sirens in it, Sun and Moon.
(Taken from the Kelpie Au!)