Well thats the end, a good sub needs to act like a sub, they got no choices, i don't wanna do this or that. For a Dom it doesn't matter what you like, its all about her pleasure and power over you, ofcourse she will take good care of actually not hurting you, no dom will ever want his pig to be hurt and become non functional. She trains the sub to be a perfect pig for her.
You never say no as a sub. trust in dom and let her train you