This is how I define and think of BL.

I don't even know where to start but dem 5 stars aint enough. I binge read this for maybe 8hrs, even skipped dinner cause I can't stop. And here I am, at almost dawn, hungry and thinking about how to vent my thoughts with how good this is. The flow, plot, plot twist, is very good. (idk if you can consider it a twist but i find myself surprised with the scenes but not too surprising probably just perfectly executed). And the characters - they all just made sense. The author/artist/writer/director really did a fantastic job creating this. I'd say this is definitely created by a pro in writing.

I truly appreciate this kind of story where I can really feel the "boy's love" (or I must say man's love). One reason i feel in love with BL, is because i admire and commend this type of love. Probably, this is how I define and think when you say BL.