Not even Princess Celestia is above wing priapism: a wingboner so stiff, it renders one unable to fly—and incredibly horny. When Equestria's esteemed ruler is afflicted by a severe case, she calls upon the Canterlot Medical School's top graduating sexual health specialist to provide the cure she so desperately needs.

[F/F]

This story is a birthday present for the wonderful lady, Miss v-invidia, aka Devious Derpy.

Edited by Horse Voice.

For those interested, here are some pictures of Doctor Panacea!

Pic 1, Pic 2, Pic 3.