Given all the threats to Equestria, Princess Celestia and Princess Luna begin worrying about the future. Luna comes up with an innovative way to relieve those fears. She wants to combine the power of the sun and moon in the most perverse way imaginable:

Reproduction.
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Picture is not mine, I will take it down if requested.

Warning. The following is a short, shameless clop-fic. If that's what you're looking for, you might enjoy this. Don't expect an enlightened piece of story-telling though.

Contains: Futa, Impregnation, Incest/Inbreeding, Hyper Butt/Cock/Balls, Cum Inflation.