I didn't see her complain, when she was releasing him, and she didn't seem angry at Kasumi either, for fooling around with MC on her bed, right after she got a creampie herself. It could be, that the chains and blindfold were meant to distract her, from seeing MC as her ex. After all she kept complaining about how similar they are, and she hated that, so she took precautions, to prevent stopping herself from fucking MC, which she seems to have wanted for a while. I think it's safe to say, we can expect more improvement in her behaviour.