See, I like fetish stuff. I like it a lot, absolutely none of what happens here bothers me on that level, but there's no heart in this. Disregarding all the fetish stuff, the relationship itself isn't elaborated upon. We know practically nothing about the characters and are simply expected to believe there's a sufficient background to warrant these actions, nor is any development happening within the chapters themselves, and for some of the relatively extreme things featured here that just isn't acceptable. I have to say this manga is purely designed to play on the cringe factor of people who aren't comfortable with it, all the while having none of the features that could turn it into an interesting read. I can't call it anything other than bad, really.