Suggestion for things to do for my FWB (F) who likes pleasure in pain

I (30M) have been in FWB with a Crazy Bish (25F) who enjoys the pain for pleasure. I started off with gentle sucking on her boobs but she asked me to bite them. When I bite them, she was enjoying it a lot and I was literally chewing the nips as she was pleasuring from it. She asks me to make marks and she touches those marks and feel happy whenever we are not together. I Love it when she shares videos of her playing with the marks I made.

I have been experimenting the pain-pleasure things like dripping hot candle wax on her boobs, nip clamps, heating metal and touching it (of course with consent and controlled).

She enjoys all of them and when I asked what else she wants, she always says what ever I’m doing is Great. But I wanna try more things that would surprise her, pleasure her more.

If any one of you have similar interests, suggest me what else I can try. Men, feel free to add your inputs too but for all, SAFTEY IN MIND

Thank you in advance.