A Bondage Fisting
He doesn’t look as if he would have short tiny fingers or otherwise-risible small hands, so I think we may safely say that she’s feeling like her bondage-anal-fisting fantasy has been fulfilled, with an emphasis on “filled”:
Artwork is by the artist Fernando.
Elsewhere on Bondage Blog:
Hot picture, but I’m not convinced it’s an anal fisting. It looks like her pussy to me (with her clitoral hood directly above his wrist).
Maybe you should do a poll :)
Naw, you’re probably right … it looks a little bit “low” to me, but the angle makes more sense for your theory. Which probably boils down to “only the artist knows for sure” given that the art isn’t that sophisticated and probably isn’t perfectly representational of human female anatomy.