This story is a sequel to Too Many Marefriends (And wives)
Still wanting to forget what happened when Discord put Twilight Sparkle, Pinkie Pie, Applejack, Rarity, Rainbow Dash, and Starlight Glimmer under a spell to "teach" him that he doesn't need a girlfriend to be happy, Eric Reed asks Starlight to cast a spell to make him forget it happened.
Not what he learned from it, but what he went through to learn it.
In a not-so-surprising manner, the spell goes wrong.
Not only did Eric not forget anything, but now he'll have to avoid the affections of just about every mare in Ponyville, and beyond! Even one that usually lives far away from Ponyville may want in on the action...
Like this story's predecessor "Too Many Marefriends (And wives)" this story takes place after the events of my "A Giant Adventure to Equestria" story, which I'll have the link for below. It's not mandatory to read it to understand or enjoy this story, but it would help you understand more of who the OC human character Eric Reed is. It is also not mandatory to read this story's predecessor, which is a one-shot, although it would give a little more context as to why the plot in this story is like it is.
And no, not that plot.
http://www.fimfiction.net./story/427481/a-giant-adventure-to-equestria