There is no dialogue in this but I still like it. I hope that you like it too. Thank you for the prompt!
(I would like to point out that introversion and shyness are two separate descriptions. Introverts can be shy, of course, but not necessarily. Introverts generally need to spend some time alone to ‘recharge their batteries’ and social functions can be exhausting to them without being uncomfortable.)
It started small.
Prussia started sneaking out of the house. Well, he thought that he was ‘sneaking’ but he knocked over vases and tripped and cursed. Germany humoured him and turned the page of his novel, licking his fingers, without twisting around. He pushed his eyeglasses up his nose and tried not to laugh.
His brother had become somewhat more, ah, exuberant in recent decades. That was the best word for it. Exuberant.