Loving pain/restraints doesn't make someone a submissive. They could be a masochist. I think that the definition of your girlfriend a submissive may be off track.
Listen to her. She doesn't feel comfortable (her reasons) with what you want to do (your reasons). And neither party's reasons matter here because one party is not feeling comfortable.
You have a desire to control her, which is likely to be against her wishes. It's no longer a kink; it is now torture (psychologically) and it's going to strain the relationship.
Think about it.
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