Thank you for the translation! So he just screwing with her? I hope not. She hasn't done anything wrong, not even the original mc seems to have done anything wrong. Looks like the they just wanted to kill her off in the novel for no reason.
I’m curious how the duchess was before she got isekai’d. For it all to be Ain’s plan, it seems weird that he’d wear the facade from the jump and greet her every morning if she never used to acknowledge him