
All S&M is power play, balanced between partners where one is in control- that's normal. What I don't like is that she is emotionally manipulating her partners into doing what she wants.
In my opinion, this one is better:
http://www.mangago.zone/read-manga/the_sensual_m/
(especially if you liked the premise of a man being dominated, it is awesome at explaining what S&M is and how to do it right)

Oh I love s&m play and bdsm, that’s why I kind of wasn’t happy with it, because it wasn’t really discussed or a clear line where to stop, no like real feel to it. Instead it felt like a man being lured into something they knew nothing about. I did read the sensual m and I think that is a pretty good example of S&M.

I could even slightly understand the scene where she was introducing him to new things (though I think she took it way to far) but when she ghosted him for a week in order to do a power shift back in her favor was just a crappy thing to do.
I also think it is important to distinguish the fact that even if he consented to "normal" sex he did not consent to the other activities she was pushing on him.
I like it, but I also do not. It feels kind of rapey in a way. Not my taste, but if you’re into that all the power to you.