Prince of Tennis dj - Niji wo Tsukamu Shonen

Pairing: Niou x Yagyuu Tennis practice is cancelled for several days in a row, due to rain. This has an adverse reaction on Nioh, who ends up lashing out at Yagyuu when he tries to figure out why Nioh doesn't want to go home. Yagyuu is unimpressed by the lashing, but is smart enough to realize that something is very, very wrong. He discovers Nioh's little secret and is even less impressed.