Alphonse and Mei in Xing, many years after the end of FMA:

Alphonse: Wait. Mei, are you… are you flirting with me?

Mei: have been since I met you but thanks for noticing

Alphonse: since you met….. ?!??!

Alphonse: WHY WERE YOU FLIRTING WITH A SUIT OF ARMOR?!

Mei: WHY DIDN’T THE SUIT OF ARMOR FLIRT BACK???