I wasn't exactly interested even at the beginning and that didn't change throughout the story... none of the characters are likable or even charismatic, the plot is suuuuper weak and weakly developed, the ending would've been satisfactory if they had proper chemistry..
I'm really into intense/dark/heavy stuff, these type of themes have to be properly written so you can either put yourself in the characters shoes or be satisfied with what happens with them. such a pity tho, I really like bdsm