Nature is a beautiful thing. That is especially true in Equestria, and you love every minute that you spend here.
Well, with the exception of one evening each year.
When good ol' nature says that it's the time of year for mares to be ready to reproduce, most have prepared more than enough methods of dealing with their urges one way or another. For most, it's about a week or two of mild discomfort. For alicorns, it's about six hours of uncontrollable urges and pure instinct.
And seeing as how you are the husband of the now-retired Celestia, you have every reason to fear for your life tonight.
There is no clop in this story, I swear.