Oh, that is fantastic. I can only imagine what the poor guy is thinking, wearing only his shirt and dreading but anticipating the lovely torments to come. Does he enjoy it, or does he panic? That awful line between pain and pleasure - you capture it perfectly. Bring on the next pictures.
On a side note, I would enjoy a series of pictures, perhaps five or six of the same characters in different stages of the tickle torture. As the pictures progressed, it would be great to see the guy grow more and more desperate and aroused as the females explore every inch of his glorious body, every dimple and cranny coaxed to its maximum ticklishness.
Well done!