The number you have dialed.. || Atsumu angst & Sakuatsu fluff || ft. Protective Sakusa 

Basically
Atsumu had a fight with his mom and he ran out of the house
He went to Sakusa's place because he had nowhere else to go
Atsumu's mom called the next day asking where he was
Unfortunately for her, Sakusa had Atsumu's phone
PS
Osamu has no idea this was happening thats why he isn't in this video