Masterpiece (Art+Story)

Warning: contains rape, hardcore sex. BUT... READ THE NOVEL! As a standalone, this manga would only be good for the art. The novel continues well beyond where this manga ends and is a fantastic story.

It took me 10 years to read that one.
Warning: rape / "characters do not seem to know what lube is"

One of the rare BL manga that portrays rapists as the monsters they really are, and how the victim lives through it. The art speaks volumes. Must read.
Warning: obviously, rape (attempted only)+bullying

I've taken my time to read that one, because of the cover, mostly. The art in the first few chapters can also be off-putting. However, if you feel like giving up... don't.
The art gets much, MUCH better as the story progresses. Realist and serious issues from a teenager trying to break out of his shell and be who he really is, and from the gay world as well.