When Satoru came back from his mission, he came back as a small chibi like cat (white cat ears and tail to match his white hair)

you sat in class paying attention to Masamichi lesson while Satoru was curled up asleep in the bun of your hair that you always kept up and you didn't mind since you two were best friends

Masamichi looked at you, then Satoru in your hair and just shook his head with a hint of amusement with a sigh