@UnicornzviThere is a mild one by Wes Boyd on his Spearfishlaketales site, with another couple which get close enough to smell - it has to be from his site, as they weren't posted here and the BtFH 'mirror' has gone. His site has the most recent postings at the top with all from #52 up posted posthumously, and doesn't require registration, though if you enjoy it a donation would be appropriate to help defray operating costs.
Best fit is #62 'Slippery Slopes' which seems to have been assembled from three partial stories/vignettes with a BDSM-lite theme; Wes would probably have filled the cracks better, but it's still quite acceptable and I'm glad we have it; it was the last 'full' story to be posted, the sole later post is more a collection of notes, vignettes and character studies. ETA: Slippery Slopes never got posted to BtFH as GMW didn't like it.
The other two are rather peripheral:
#32 'Stray Kitten' has the development of a stable D/S relationship as a sub plot thread; the MCs have small roles in the later NSLT stories. This is not the obohobo story of the same name posted here.
#08 'Andromeda Chained' has self-bondage as a plot thread, with both bondage characters individually having cameos in some later books (though without the bondage as this was 'cured' by the end, although it's referenced), including Stray Kitten.
ETA2: IDK how realistic they are, not being in the scene, but they seem plausible to me.
ETA3: By coincidence, I'm currently reading Wes's Dawnwalker, and I've a couple of questions which you folks might be able to answer. First, he refers to an 'Irish backhoe', is this Mitchegan or Midwestern slang, perhaps for a shovel (which fits in context)? Second, he refers to 'pilerun whiskey', by context cheap and rough liquor, is this another regional usage? Google AI answers gets the first completely wrong, and suggests the second is a typo of 'piperun', but I wouldn't have thought Wes would get that wrong, he uses it in more than one story, maybe the typo they refer to has become naturalised regional usage.
Update: a PM gave me the answers Yes and Yes, from someone who had asked Wes about ths.
ETA3a: (a very old, politically incorrect joke)
Q: How do you confuse Paddy?
A: Show him three different shovels and tell him to take his pick.