There is one genderbend manga I think it only has a chapter thats what it had when I read it. Basically theres a boy who turns into a gurl when ever his heartbeat rises and his bully falls for this girl version of him.
I dont really think if its bl but its a manga thats about a gay mans real life where he speaks about how he struggled with being gay. I remember he finds a partner at the end but rather than romance it focus on his hardships accepting himself and coming out.
It isnt really "shonen" . But it just got "that feel" you know what i mean?? It's hard to explain. It's different than your typical yaoi. These authors have a really distinctive artstyle. If not very simplistic, its very stylized... Yknow, it's just those kind of BL where you dont mind any plot as long as the delivery, the atmosphere and the vibe is good. well, at least in my opinion.
Unique and unusual BL's
This list is in order from my most favourite to my least favourite