You say ‘the cup’ twice in the first sentence, you don’t need to. You could change the second one to ‘its rim’.

I like the factual tone of the main paragraph. It’s especially effective in the description of the eyes. There’s a good sense of confusion in the piece.

It left me going huh? and wondering how the narrator fits with the description above – since it’s all so factual.

There is many mistakes in this piece of writing. I never felt the character and so it left me not caring for the story.