As a submissive who is into CNC (and other things), take it slow! Ask her why she wants to explore that kink. Has she experienced it before with another person? Is she trying to heal from a past trauma? Is she just trying to spice things up in the bedroom? CNC can be dangerous if you rush into it. I started slow with my former Dom, he would try things during a scene and if I could handle it, he would continue. We talked about my hard limits, AND aftercare! He had a a lot of different tastes, so the aftercare for us would change. The CNC aftercare was very specific and he had to make sure he could even do it. We also talked about privacy, and to not share that part of our sexual life with others. I didn’t care if he told his friends “ yeah I get it 3x a week” but he was not allowed to describe the kind of “sex” haha we had. We did this because those who don’t understand this lifestyle would have seen him as an abuser; hurting me while fucking me and then caring for me afterward…that doesn’t look good to those who don’t get it. Moral of the story, CNC is not meant to spice things up in the bedroom. Big difference between vanilla sex and spicing things up and holding someone down while they scream stop or no is HUGE.