sakusa likes to shock atsumu awake by yelling “ATSUMU” really loudly at like 4am for fun. and every single time, atsumu jerks up, hurriedly combs his hair, eyes half open, he takes his bag and leaves with no pants on.

sakusa counts to 60 and he hears the lock on the front door and a very grumbly atsumu walking back in.
sakusa: hahaha this never gets old
atsumu: our security guard has seen me pantsless too many times omi-kun

sakusa wheezing when atsumu gets back
atsumu: i’m glad u find me being an exhibitionist funny
sakusa: i dont even know what youre rushing to but youre always rushing whenever i do this
atsumu: LISTEN I ALSO DONT KNOW I JUST THINK IM LATE WHEN U YELL AT ME