On a rare occasion, I see a piece of art in which the Snape makes me say, "Ah yes, that's him exactly!" This is how I see him. You certainly nailed your genre and prompts, and the title is perfect.
I really like how this gruff, physical Snape is capable of a tender moment, and Harry's peaceable-ness and obvious contentment is infectious. The detail is great too--the body hair, the stockings, the texture of the coverlet. What a beautifully done entry, my Snitch!