Ew, slavery shit... though it seems like the protag ultimately isn't going to be following through with actually purchasing and is instead going to have to escape alongside the dwarf gal.
Still remarkably gross how they were legitimately going to make that purchase though.
So your butthurt is entirely your own fault, gotcha. Also, gender-bender yuri is far from common, and doesn't do anything to mess with the "purity" or "vanillaness" of Yuri any more than the Harem tag would.
ngl GB is like the most miss used tag, story that have a random side character getting GB get the tag but some where it is the MC do not get it for some random thing, hello The Saga of Tanya the Evil
Also a very miss used genre by author in general but that is another issue