In the Everyone's Best Friend is Twilight Sparkle universe, most of the girls grew a cock after the first time they encountered Equestrian magic. This side story takes place during those events.

Sunset Shimmer returns to Equestria to see if Princess Twilight can help her figure things out, and she ends up stuffing the other princess with pony dick in the process! Well, how else can Princess Twilight help if she doesn't get some firsthand experience with it?!

Tags: Ponies (My first ever full pony story!), Futa/F, Twi/Sunset, Sunset/Celestia