I am not surprised about this OP, for me the more specialised service is why I punt, vanilla is for me so yesterday.
I have spent years wishing for some weird stuff, and have now found out it can be achieved.
However , I find it easier to ask for the less regular stuff, once I have got to know the WG, and built up a rapport, another benefit of a regular IMO.
After all, its an interesting situation, where you a re basically telling a near stranger the deepest corners of your inner being, its a form to therapy I reckon !
I certainly feel much better now I have shared these thoughts and acted on them
So my recommendation is to bite the bullit and ask away, its very spooky when you have been tied up in knots thinking about what you want, and the WG is not at all phased by it, and gets into it as well, go for it my man!