the big slip up

so my partner and i have been together for a while now. we both like to explore different things sexually and have always had an open communication about our desires. lately though, i've started really wanting to try out more dominance type stuff. nothing hardcore or abusive but just some playful control and discipline kind of play. i told her this in the beginning and she was cool with it as long as its not too extreme. last night we were having a conversation and something happened that's been bothering me ever since. i dont know why exactly but it came out my mouth that im supposed to call her mistress from now on, like really mean and harsh and demanding stuff. i had never brought up that aspect of what i want before even though its kind of part of the fantasy i have. she got all quiet and stopped talking for a bit which freaked me out bc we normally talk through everything. we ended up not doing anything but this has been on my mind alot today. im worried maybe i pushed her too far or that i might be pushing myself into something that's just too much to handle emotionally. she seemed okay with it but also a little unsure and now i dont know if its because shell feel weird about me calling her mistress from here on out or what. idk how to bring this up without freaking everything out even more. maybe shes not ready for this yet but its been something ive been thinking about a lot lately. im just really worried id end up making things worse by bringing it up again.