My Bro Turned into a Girl? What Do You Mean Her Affection Was Already Maxed Out?

(The cover image was found online. I'll take it down if there's a copyright issue.) Jiang Xing is a fan of gender-bender stories. Although he has imagined what it would be like to become a girl, he never thought it could actually happen. But… Why did he wake up as a girl the morning after his sophomore summer vacation ended? Zhou Luming has been friends with Jiang Xing for a full fourteen years, from elementary school through college. He knows his best buddy likes gender-bender stories, but he has never looked down on him for it. But… Why was he ambushed by his newly female best friend on the morning of the second day of summer vacation in their sophomore year? His buddy had turned into a girl? And what did it mean that her affection level had been maxed out for ages? Years later, Zhou Luming asks, “Why did you choose me?” Jiang Xing smiles. “The answer to that was already crystal clear on that morning in first grade.”