The boys from your class had sports now. You, however, were excused because of headache and sat on a bench (U r male)

The boys had to run a few rounds outside in the warm weather. You didn't have to do anything so you just watched them. Especially Xiao caught your eye..

After the run, everyone took a break. Xiao was sitting on the ground, leaned back on his arms, looking up. He was sweating a bit and panting heavily, his eyes closed as he was trying to calm himself down again.