Try External Link/Members Only lots (7 sub and 71 switch)) of listed escorts that will offer you a kinky service
Have you read some of those profiles? I know I said I'm kinky but most of these girls are right up their own arseholes!!
That site has links to their own external sites, very few of which state any rates just says "POA" (only in much posher parlance - here's one quote "My rates, much like the delights of our time together, are bespoke!"

- which is prossie speak for "small mortgage" in my experience! One of them states £250 for an hour!

Many of them also ask for deposits up front (I just saw 50% deposit listed on one profile!!

).
This is from another profile...summarised "I am very much a part-time courtesan and choose to spend
ever so sweet moments with only a select few. I like to take my time with my
lovers, slowly drawing out the pleasure to its maximum and so specialise in longer, regular engagements....I only see a few lovers per month, so make sure to pique my interest in your initial enquiry, for
I am highly selective of who I spend time with....For new lovers, it is
best that our first rendezvous be on the gentler side. Respect and trust has to be established before I am willing to explore more kinkier endeavours."
In other words - I'm right up me own arse and expect you to pay premium rates for some vanilla as fuck meets before I'll consider getting kinky.
Riiiiight!!

So let me add another stipulation - Adultwork escorts much preferred - at least they tend to be a bit more realistic!