Calling (MIYAMOTO Kano)
Afterwards, read the dj, (also by Miyamoto).
How to Seduce a Vampire
Apparently, it's boring. However, I'll read it anyhow, as it's VAMPIRE YAOI!
Makeinu No Nandemoya
Definitely not a yaoi, and barely even shounen ai, but fun, I guess, if you have time to waste.
Kokoro Kikai
Just... fucking... beautiful!!!
Nanohana Boys
Long and not even BL, (though I think there MIGHT be a tiny bit of it, they definitely don't end up together), but it still looks like it's worth reading. It's mainly about the character development, which imo, is the most important ingredient for good fiction.
Rutta To Kodama
Looks absolutely adorable if you're in the mood for some saccharine sweet fluffiness. Tbh their relationship is really heartwarming to read about, even if it seems pretty unrealistic for teenage boys. It would work much better as a yuri, but there are already too many yuri like this anyway. I like the fact that the art style really reflects the warm fuzzy feelings given off by the couple. The cat is adorable too. Read this when you need something to warm the cockles of your heart.
Flowers