On the topic of Japanese porn websites, there is also "Mistress Land" with their "MLDO" series, which they usually update previews of on various free porn websites, all of them with subtitles and pretty varied kinks and scenarios. Ocasionally you can find one of their full videos on free porn sites, but their actual subscription prices, on their Japanese websites, are insane, (something like 40 or 50 dollars per month

) so I only watched whatever I found for free, but there are hundreds of vids and some of them are pretty hot. (I'm mentioning them because I'm surprised nobody else did)
Also, this is more for veterans of the femdomnet and makes me feel extra old because they're ancient, but does anyone remember Yapoo market? (YMD?) They had the best Japanese femdom whipping, trampling, pissing, hard sports and pretty much everything more hardcore, but I think most of their stuff is from 10 years ago, if not even older!