He pretends to be a doctor to fuck with girls
Their strategy is quite basic but effective. He poses as a doctor, and to do so he usually hypnotizes all the girls who come to his office. Well, not to give them a check exactly, but more to strip them naked and fuck them. This girl was one of those who came innocently, but after being hypnotized she surrendered completely to his will. He did what he wanted with her, he undressed her, he touched her… he sat her on an easy chair and there he opened her legs to play with her wet pussy. In the end of course he fucked her, that was the goal of his fake consultation of course.
After that fuck he ended up cumming on her face while she looked at him completely absently. And so with her face full of semen, he dehypnotized her and she woke up from her trance without knowing what exactly had happened. Maybe the milk on her face gave him some clue.