Rachel's books

This is told in alternating 1st person. Cassie is a breast cancer survivor. She also draws and does tattoos and approaches MJ for an apprenticeship. MJ only agrees because they shared the same mentor. MJ's business is not doing well.
I wanted to like this, but really hated MJ. MJ was a bitch. And not in a good way. She is nasty to everyone. Cassie was meek and a bit of a doormate. But the time MJ was kinder and Cassie more spine, I really didn't care.
I read this for Romance-opoly Rainbow Row square Sun track.