[Yamaguchi isn't surprised in the least by Tsukishima's lack of goodwill, which is probably why he doesn't notice anything there's else amiss with his friend—yet.]

'Want?'

Ah. Uhm– [oh crap oh crap, how does he convince Tsukishima that Oikawa's only interested in being friends when even Yamaguchi isn't sure that's the case going by all his little and not-so-little insinuations…] –W-Well, I mean, about his niceness, that's what I thought too!! But it turns out that's really just kinda how his personality is…!