Fuck author, so he pulls this shit with her that she doesn't know, fuck that she should lose for that but in the end what matters is MC feelings and she will win anyway after this "without knowing her feelings", to realize in the last second that indeed are romantic, fuck this shit.
I doubt that hero party will defeat the demon lord and will need to rely on him in the end and his army by synopsis.
It's cool that the hero party weren't scum, but like always they don't know that they are losing the best.
It's a trap and he will say no and with that he will secure the girl good side.
I'm amaze on how people can be such scum even knowing that they are dying for real, they don't care and even wish for them to die.