The main story of the couple is shounen-ai, but the extra chapter of the couple has some little yaoi moments. Basically, as long as you don't read the extra chapter, then you won't have to worry about yaoi.
Where did you found the raws?! (=・ω・=)
Thank you, Natsuna.
No problem. You can search for the raws of many BL series on forum.nihonomaru, but I recommend you sign up so that you can gain access to the download links (it's free). Also, please do not share any raw links you find there. It may risk the links being removed due to copyright claim.
I really like it so far, I just hope it is just shounen ai. I prefer that to yaoi. But I'd still read it anyway.