Oh my God, definitly this is abuse, as i always say, i think that a good D/s relationship is based in the trust and the mutual pleasure, on the limits of each other, when one of them start to feel unhappy or what he is getting doesnt make him feel pleasure so, there's a problem, a Dom must to manage the feelings of his slave but dont destrory his life bec when the Dom pass the limits of his slave it becomes from abuse