Of course, John is not a coward, but sometimes it's just better to stay away from Sherlock. And his boredom. And the whip.
And seriously, DON'T EVEN THINK ABOUT SLASH TOGETHER WITH THIS PICTURE.
Disclaimer: Characters (c) BBC / Arthur Conan Doyle // Character designs made after their respective actors // Art and idea (c) me. I don't earn any money with this.