Their tune up game was about to start Shiratoriwaza Vs Inarizaki. Just a simple friendly tune up game. During the warm ups you notice Atsumu was more distracted and out of it than usual, let alone he kept sneezing and he looked paler. As he approached you minutes before the game started he said in a low tone

he rubbed his temples “keep a secret for me, i think im sick babe.” he said as he tried holding his cough “dont tell anyone though i wanna play.” he chuckled and ruffled your hair