In the Manga it's alot easier to get him huh lol If I remember correctly she had to pander to him for a few months before he agreed
No, there's a web novel. That's being translated. Here: https://www.novelupdates.com/series/common-sense-of-a-dukes-daughter/
start from the every last page to get to the first chapter
This good wholesome, heartwarming content is everything right now, I love it