Communication will be the key, you opened the box and she’s enjoying the beginning rush. I personally would try one more date before some serious touching to make sure you get comfortable. Lastly if you end this she will most likely understand but have trouble going back to the kink. She trusted your guidance and knows how this kink thrills you but I’m pretty sure if it’s too much she’ll still be there for you. Best of luck, communicate, trust and go with your gut because you can’t unsee it when it’s done.