Intertwined Timelines

Moon has always been close with Solar. Ever since he and Eclipse ran away to his dimension and asked for a place to stay, the two were always attached at the hip.
It was when a secret that has been kept from Moon for the entirety of his friendship with Solar, that shocks him into an oblivion. Little do they know, a time ending catastrophe was on its way, and He and his sister, Sun, had to get involved in order to prevent a calamity.

The funny thing is, that very secret of the two eclipses might've just saved their lives.