I never read anything like this before. So, I will be with you in this story.
Very good start with a completely different concept.
I can't judge anyone at the moment. Everyone's POV looks believable and their motives look legitimate.
PS: I heard about stories, where Arnav had to marry Khushi when Khushi lost her loving husband in an accident while she was pregnant. I never found those stories. So, this is an additional bonus for me.