How is this yaoi?

It was a mistake. It should in fact be Shounen Ai -- I personally still don't see how, but Hibari says that that's what the original author classifies it as, so... I guess we'll have to wait to see how it turns out...

On mangaupdates, it was yaoi. That's why I reported it as such when it was under shoujo.

Yeah... It's not yaoi, sorry.