Rainbow Dash finds herself unable to fly, trying to ignore the weight she has been gaining which had slowly been ruining her athletic ability. Applejack manages to persuade her partner to ask Twilight for advice on the mysterious weight problem which soon results in discovering a highly unexpected, surprising, and biologically confusing reason to their growing problem.

This is a vaguely old story created for a contest, also no I have no personal experience viewing someone going through such an event myself. Well I have seen a cow go through with it, but I decided using such an experience wouldn't really be romantic.

The cute picture is from deviantART user http://xhazard78x.deviantart.com/