Tukano: That's really nice work. I like the way you use the grays to create the shadowy admosphere. The anticipation is clear in your drawing as well. It holds a very erotic quality overall. I'd love to see more work like this from you. I think the darker genre suits you nicely.
While I'm thinking of it, I had a cat who simply loved to be tickled in his 'armpits' (if you will.) You could start tickling him there, and he'd roll over onto his back and start purring his loudest. Of course, that's a different type of tickling.
I prefer to tickle the armpits of a female species!