Ink Exchange (Wicked Lovely Series #2) Book

I'm not really sure what to say about this book. It disturbs me that the protagonist, Leslie, who has survived a horrible sexual assault is, by the end of the book, repeatedly used both emotionally and sexually for weeks by the Dark Court king. Yet we're supposed to think this is a healing thing because her proximity to the Dark King feels so good that she forgets everything except being with him. But she wouldn't need him or feel anything toward him were it not for the tattoo using his blood that was put on her back and he knew that she'd need endless sex with him once it was done.
I found this story truly distasteful, particularly since this book is YA. I'd expect this plot in a novel with adult characters, not teens. The fey have lived hundreds of years and they can't find adults to interact with? Creepy, and not in a good way.
The most sympathetic character was Niall but his backstory is never truly told and his relationship with Leslie fizzles.
I was also very bothered that the tattoo artist who put the fey king's blood into the tattoo on Leslie without her knowledge pays no price for doing this to her. No one is angry, Leslie comes to acceptance of what he did and that's it. He helped the Dark King trap her and use her but no one seems to care. Humans have died because Rabbit did this to them in the past but since Iriel comes to care for Leslie, we're supposed to think that makes it okay, I guess.
One of the things that continues to bother me about Marr's storytelling is being thrown into the story without ever having the action explained or clear until the book is more than half over. Even when the book is finished I still don't know what a Ly Erg, glaistig or the Bananach are and I feel like I need to read these books with the encyclopedia of fey creatures sitting beside me. If you're going to create a whole world, kindly explain how it works and what the creatures are.
For me, a disappointment.