Aw, I have a Marc too! It annoys me when people call him Mark since there is no K in Marcus Aurelius, and he has something to do with the character because reasons.
Anyway, here you go:
It seems I can only post thumbnails in the novel format here, but I have a lot of commissioned artwork you can find here:
https://archiveofourown.org/works/18861493/chapters/44766832