Yamaguchi is spending less time with Tsukki and more with Shimada, practicing. Tsukki doesn't like this, but if he says something his friend might notice his feelings and no way in hell he is letting that happen. Of course, then Shiamada offers Yamaguchi a job in his market, besides being seen "too friendly" with Freckles.

Tsukki doesn't approves.

Basically, Tsukki is in love with his best friend and is pining after him. If Yamaguchi notices this by himself or if Tsukki can't take it anymore and tells him is up to you.