Play Me #4: Play Me Real by Tracy Wolff is the fourth book in her 5-part serial, Play Me. 
 Picking up right where the previous book left us, Sebastian has left Aria's aprtment complex. He has left her to deal with Janet and is worried about how she will react once she hears the whole story from Janet about Dylan. Upon returning to the Casino he is notified by his security team about a problem at the high-roller tables. Of course, it is the Russian "whale" that Aria racked, again. Before Sebastian can get too violent with the Russian, Ethan steps in as the voice of reason. Back in Sebastian's office the two best friends are discussing the incident and again, in comes Aria, less demanding this time and Ethan leaves in a hurry (*chuckles*). She's heard Janet's story and now wants Sebastian to share his. 
 "You're hurting Sebastian. You think I don't know that? You think I can't see it in the way you hold your body? Can't see it in the way you try not to breathe too deeply? What Janet said is destroying you and I don't like that. I may not have known you as long as she has or know you as well as Ethan does, but I know you Sebastian Caine"~ Aria 
 Their romantic interlude that follows gets very deep into control and Sebastian keeps pushing Aria and pushing her and afterwrds realizes that he may ave pushed beyond her limits in his effort to remain in control. Even though she had let him, it may have been too much, too far. 
 She loves him and what he does to her but because of her own past and secrets that she hasn't yet shared, she doesn't believe they can work so she leaves.