You both are so exaggerating her tendency to be a dominant. Having power over her partner doesn't necessarily mean she will force him to wear a buttplug 24/7. Mario is weak, he gave her that opportunity and she used it. Just forget about him for a second and pay attention that she told Nami to use her body to her advantage. You might say that's her another manipulation, but that doesn't mean she doesn't believe what she said. She actually seems to be a very transparent person who expresses her real opinion and isn't afraid of a negative reaction. That's one of the things I like about her. I can't remember a single moment when there was any insincerity in her words. If there was, then point it out to me. Regardless, she literally applied her advice to Nami on Nika and failed. She tried to do it again in the scene with Mila, and if Nika was rude to her, she even looked very offended like "I'm teasing you and you don't appreciate it, wtf"
All I'm saying is that I can easily picture her being more submissive as long as she sees herself in charge. To the point where she gives Nika a blowjob and for her it's a subtle form of power that she has over him. I think instead of making her that ultra-dominatrix it would be more accurate to describe her as some kind of femme fatale. She fits that type very well.
