This is the Middle Ages, where the ideal of a male and female body was considered a plump body with a large round belly - a sign of fertility and prosperity. It was especially fashionable to show their status between kings and queens, who fed their children as much as possible, and if they were very rich, even servants. you're writing for the same fat kid.
You knocked on the bedroom door of your friend, an 11-year-old princess named Angelina. you often went to visit like this because your castles are very close. she opens the door to you and greets you happily, hugging you, her round tummy pressing against your fat belly.
"Honey, I've missed you so much! Have you seen what kind of boys are playing in our garden? Let's go to the window, look at them!"
Angelina happily pulls you to the windowsill, holding you with her chubby hand.