Hi OP!! Ignore the weirdos. Antis and trolls are so odd lol.
But to answer your question it is indeed YAOI but it takes a long time to get there. It will be a while. So definitely “slow burn”. Because even the smut has some plot that takes place before they do the do.
Hope that helps! The story is super cute though, so if you don’t expect the smut, it’s fun to read regardless. Not saying what you should do, but just recommending the cute parts of the story.
The reply to the OP wasn't wrong, if what someone is looking for FIRST before reading a BL is the presence of sexually explicit parts, can you truly say they aren't addicted to porn? It's like saying homophobia = being afraid of homosexuals, is it not being disgusted or the rejection of homosexuality instead?

Its cute and everything, its downright adorable, but I started reading it because it was labeled a yaoi. Where's my smut? XD