I've been more getting the opposite recently (i.e. declined OWO even though it's a listed included service, which other punters get per their reviews. I guess this might be as I'm not shaved).
But yes, I've had it too, mostly spanking, one lass even suggested I use my belt on her. Arguably not a service, but I've had a few lasses say they'd go out with me for no charge (foreign agency lasses who recently came to London, possibly a bit lonely and want a native to show them the city sights.) In my case, I don't think I'm the only punter they'd offer the exceptions to - though I'd expect they'd not offer to transactional / P&D types, only to fellow GFE type punters.
As for yourself OP, sounds like you have a strong connection ( 'enjoy each others company' ,'share some private secrets' , 'like taking each other to next level of orgasm.') In my view, it's quite likely that in your case, no one else gets the off-list services. It's a common thing for a WG to have certain things she'll do only with her boyfriend. Some WG's dont have BFs, but they still have a desire for true intimacy, and be open to forming a partly romantic connection with a single punter.