Seijoh Inc. {iwaoi}

I do not own this story. All credits go to the author: DeathBelle, on Archive of Our Own (ao3)
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Iwaizumi Hajime gets an incredible opportunity to work for Seijoh Inc., one of the most respected businesses in the city. Everything is going well until he insults an incredibly rude man who turns out to be the CEO's son, Oikawa Tooru. Iwaizumi expects to be fired, but instead Oikawa develops a strange fascination with Iwaizumi and refuses to leave him alone.

Iwaizumi is fairly certain that Oikawa is simply trying to annoy him to death.

In which Ushijima should keep his mouth shut, Hanamaki possesses extreme patience, and Iwaizumi decides that perhaps Oikawa isn't quite as irritating as he initially thought.
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Includes side ship/couple oneshots!