miyacest headcanon so a headconon i have is that the twins know sign language and/or morse code. so whenever they are in a argument or they want to dirty talk to each other but other people are there, they will simply sign to each other or tap on the table and whenever they

do it, the team just thinks that their in another argument and assume that's their way of talking. but in reality, atsumu is saying that he wants to be bent over on the table and fucked infront of all their teammates and osamu is agreeing.