Make a comedic and vividly detailed BBC's Merlin story with Merlin and King Arthur deciding on skinnydipping to relax after a long day. Soon, they're both in the buff as they're entering a swamp pond near Arthur's home (describe Arthur's butt and physique, describe Merlin's butt and physique). Describe how Arthur looks as he lets out a fart into the water, enjoying the relief while the underwater stench is causing a few dead fish to pop up on the surface. Merlin farts too, causing more dead fish to surface. They collect them and cook a meal using them. Add dialogue throughout the story from start to finish