It won't last.
I know it, so does she.
Comfort for the moment, turmoil for eternity.
But seek I the peace of the moment, for in there I shall find respite.

A short story on the romance between Celestia and Sombra, set in the alternate universe of the reflections arc.

Oneshot of Somlestia. Named after Frank Sinatra's "Summer Wind"
I can see the hatemail already. Not exactly canon.
Cover art from:http://mlp.wikia.com/