Sure, happy to. I was drinking very heavily and using drugs at the time, mainly as I know now to self-medicate and forget my abusive past (I'm now nearly two decades clean and sober through AA and NA). I was also a Goth and active on that scene. If you're hanging around people who use party drugs a lot (speed, coke, E, MDMA) and are out clubbing a lot, sooner or later you will start being around people who want to push the boundaries of life in general - because they're traumatised, because they're lonely, numb, they just want to feel something. Pretty much everyone in my social circle had some form of past trauma which I think is why we were using drugs and alcohol the way we did. And on a scene like that there's always going to be predatory men, in it for what they can get (many of them are also abuse survivors of course). Also, there's definitely a crossover between elements of the Goth/Cybergoth/Cyberpunk scenes and BDSM. Like I say, it's about pushing boundaries. So, hang out on that scene long enough and sooner or later you will meet people who are also into BDSM and someone will suggest you come along to the next night at this famous London BDSM club. The club as I knew it have several floors and to of the floors played music I was into as part of being a Goth so that was also an attraction.
So you go, and if you're me, you're drinking heavily and taking drugs and of course that lowers your inhibitions. My first night, I agreed to a certain act with a man and he immediately stormed through my boundaries and went three or four bases beyond what we had agreed. On that occasion I shouted and wriggled free but on others I didn't due to being wasted/full of despair/not feeling I was worth anything.
I remember on my first night lots and lots of mainly men gathering around a cage that a girl was in. The things that the dom man was doing to the girl looked painful and I suppose I gasped or swore or something because several men turned round and assured me 'she loves it don't worry'.
Now, disclaimer I've got no issue with BDSM as part of consent, two adults yada yada. I would just say from my experience that 1. The scene comes with A LOT A LOT of drugs, more endemic than normies think maybe and 2. Consent can be blurry if you are an abuse survivor, wasted or generally vulnerable and also maybe not au fait with how the whole thing works.
I think it's very murky and was actually quite shocked when I went to Pride a couple years ago to support someone I love who was in the parade, to see that the BDSM scene was represented in the parade. I thought that was actually the antithesis of what Pride should be about, which in my view is about safety, tolerance and respect.