yeah Lena doesn't have to like Seymour either, she just have to be neutral.I'd agree with camube that the voluntary working with Seymour is quite "believable" -- if Lena forms a positive first impression of him (which is easy enough, she kind of expresses it by default) i can vey well see her getting swept up by Seymour's charisma and rhetoric, combined with the "high class" treatment she receives (particularly if it's highposh
Lena who is more responsive to displays of wealth etc).
The player might roll their eyes at Nietzche being touted as the top dog of philosophy, but Lena, while potentially intelligent, is still a fairly regular person, one who can easily buy into this mindset (similar how many people come to believe Machiavelli was a political genius because he's such edgelord about it) and the idea she's interacting with top-class intellectual, and strive to match/impress him rather than laugh straight in his face.
And Eva giving a break-off point in Ch 11 on whether or not Lena would voluntarily dive deeper into becoming Seymour's muse or end it right there after his second advance with the toy is great storytelling.