Apart from the fact that there's basically no build up to the relationship and no real explanation what that deal they have even entails:
Just like the relationship, whatever it may be, the sex happened way too early and almost immediately escalated to pet play and punishment. Without talk. The ML himself says that MC is naive; MC seems so confused and coerced into that situation.
I felt so uncomfortable I couldn't keep on reading.
The beginning is kinda weird and everything is rushed but (and this is a sad thing to say actually) it's nice seeing a bottom be so enthusiastic for once.
I like the story.