A win-win situation for all! Presumably they'll fall in love at some point, of course, but a story about two people becoming good friends over the course of their mutually beneficial "fake" marriage would be interesting.
umh was the duke surprised about her being so gung-ho about their agreement? is he one of those:
''i cant believe a girl wont fall for my charms'' kinda guy? coz if he is , then this is gonna get dumb
Oh i'm loving this, can't wait for the seedy little secret to come out, loving the MC tho, she's a Gem!
now what could the Duke be up to...
hum... total speculation here:
planning to plunge his house into destitution so he can marry his "girlfriend" and blame it all on our MC?
Watch her take it all in stride and turn the finances around as very thrifty counter-measures get gatlin'ed out of her mouth?