So, Rule 63...
I doodled this last night for one of oxoniensis's Porn Battle prompts. It's about as porny as I get on any given day, that is to say, not very. But it's probably not totally work-safe. Prompt: Ruby/Sam Winchester, Rule 63, blood.
(Co-incidentally, it fills one of my trope bingo prompts, yay! Click to enlarge, as per usual.)
Pencil on paper, a little digital coloring.