Responses
Maybe because since he'' saved'' her she thought he will be able to protect her from the dangers of this world so she though of anything that came to mind to retain him, and since it's a romance we'll seducing him didn't seem that bad and it worked so good for her I guess.
Well it does look stupid seen like that but it's the premise
I get that the girl is clueless about the new world around her but she became independent from a young age and started working early in the Modern world so how is it possible that she has no idea about how any normal person in the ML's position would react when she decides to KISS him out of nowhere. Like what is she even thinking- and what was she expecting would happen when she kissed him? Was that supposed to distract him? Make him want to keep her around? What if the ML would have been someone with not any self constraint or common sense? Anything could have happened to her god I hope we see some good character development for her