Short Story Saturday: Merlin's Mother

I was watching Tales from the Royal Bedchamber recently on BBC4 when suddenly, part way through the documentary, the expert being quizzed about what royal beds were like in the Middle Ages whipped out the following picture.

Presenter Lucy Worsley was delighted and amazed asking of the nun, "Who's that?" The expert went on to explain that it was a scene showing the conception of Merlin the wizard. To read a different take on the same incident, check out my story Incubus in Dark Heart: A Collection of Short Horror Fiction.