Favourite enchanted romance of the show

I'm introduce my littles to Merlin and we've just watched Sleeping Beauty featuring the enchanted love affair between Arthur and Lady Vivian. Which as got me thinking about what the funniest storyline which involved magic-induced romance was in the show. I'm finding it hard to decide between Arthur & Lady Vivian, and Uther & Lady Catrina/ The Troll. Both gave the littles and I a really good laugh.

Do you have a favourite?