It was clear that she wanted it and the man also told her "if you resist I can tell because I know you". She wanted him but she considered him a failure (as was her previous men who cheated or dumbed her). So she found a calm one for stability but she did not love him. But at the end the calm one was just wanted to get marry for work purposes, he didn't care about her. Meanwhile the "Egoist" left her because he knew she could not kept the relationship secret and the company at that point did not allow relationships between employees. But when she was with the calm one he made his move. And fight to alter the company rule in order to start a proper relationship with her.
Ehhh, the last one, did the mangaka want to make it look like rape or not? Did she want to and was just sad because she wanted to ha a relationship?