Two things to say about this one:
1) I hope the people that got weirded by the characters getting beaten and hurt were weirded for reading it BEFORE the Ryona
tag was added. Otherwise, well, you shouldda know what you were getting into.
2) this one depicts rather clearly why the BDSM community has the words "sane, safe, consensual" as a mantra. Clearly, nobody ever told the characters about that mantra. In that sense, it was... unsetlingly realistic of what could happen in such a situation.