Not humiliating at all he is actually a very lucky boy to enjoy this experience I can think of many things that would be much more humiliating for him than this
The most cruel Christian Mistress I've seen! She knows it's about love and her slave is desperate! She wares her cross w/o shame, and tells the slave that he is bad. One kiss from her and a few kind words might cure him? But, she tells him, "that's" the closest you ever get to kissing me! ?