Boner Fairy

Will is in a frustrating situation. He keeps experiencing unexpected erections. Frustrated, he contacts a mystical healer to diagnose his issue.
The healer reveals that the source of his problem is an enchanted being known as the Erection Incubus. To rid himself of this entity, Will must apprehend it. However, the transformation has stakes when the Incubus proposes an unholy copulation session as a condition for departure.
Oops, seems the healer left out this critical detail.