
Its yaoi ..nice sex scenes but overall i totally agree i always come back for this one!

Shounen-ai can turn into a yaoi, but a yaoi can never be shounen-ai.
I don't know the origin of the words, so I can't be sure, but from my experience, shounen-ai is the epitome of BL (boys-love), there is sexual tension and allusions to more, but USUALLY nothing explicit. IF a kiss is drawn into the manga, it will usually stop there (unless the mangaka draws an extra to tease).
So basically, shounen-ai is BL minus smut. Yaoi is anywhere from grinding, to light, toned scenes, to full blown, inked, zaria-style sex scenes.
If you're talking the perfect shounen-ai, I recommend this one :)
http://www.mangago.zone/read-manga/kanjou_spectrum_yoneda_kou/
To me, it's perfect the way it is. The feels are real. And I love it <3
What should I say about this?!
It just so perfect, the cuteness are overload!! I love it. Definitely my favorite shounen ai .