It's been a problem for a while now, but now it has reached its peak.
The males of Equestria are becoming less and less common. The odds of having a male nowadays is 1,042:1. All the stallions are held in containment for safekeeping, as sexual assault is at an all time high. Every mare wants a child, after all, and it's becoming harder to become a mother, and some will go to extreme measures to do so. It is considered a privilege, not a right, to have a child.
One mare, who has been given the a-ok, has never felt more thrilled at the mere possibility of bearing a child. But soon, everything begins to topple down for her, and she begins to have second thoughts.
Thanks to Tale Trillionare, and Jay Romeo for pre-reading.
Also, thanks to Kleora for editing!