Thanks to CrackersnCheese for showing it to me.

The first thing I remember thinking of it was, "It looks like natural morality is hugging artificial morality! So adorable!"

Some of the sites that host it say the characters are an angel and a demon, but I don't know what the artist (Luis Royo) thinks about that. The series (*possibly triggering images in linked site*) is called III Millennium, so I would assume it's supposed to be a futuristic science fiction motif of modification of the human body (in this case, cybernetic for the male character in front and perhaps genetic for the female) to confer superhuman attributes or abilities. But only the artist truly knows.
By the way, it's still John Montagu's birthday in my time zone. Have you had a sandwich today? In honor of Hug a Psychopath Week, may I recommend this one?
