He's taking care of his pet.
Those guys are roleplay characters (the one I play is, of course, the sub :'p). I just felt like uploading that drawing here because it's the kind of kink I enjoy a lot.
By the way... remember what I said a while ago about getting 10.000 pageviews ? I'm close to get them, now, so here's just a little reminder :
When I'll hit 10.000 pageviews, I'll open a journal for you guys to make a photo request. With my photograph, we'll pick one and make some real photos based on it (the person who'd give the idea we'll pick would be credited for the idea and receive a larger version of the picture).