if you want to go with agent17 in the bathroom you need to go in the basement and go to the secret room after that go to the hidden door and go to the living room where agent17 is alone
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Yes, it is the area where Adel is. You can go past her after torturing the maid where she won't pay attention to you. If you go through that method then Lamia won't be with Agent17 and you can progess. Once you get to the X mission with Agent17 there's no further content so it's uncompletable (just a heads up on that).