Here's what I just learned: I need to read more one-shots. Usually, I read short series or trilogies for some reason. Aaaand most of the one-shots I do read are yaoi. (Stop judging me!)
Here's something I really liked:
Kazuo Umezu's Scary Book is scary. Crap...that cover says volume 2.
I think I have to pass on this one, unless you just want to know my favorite one-shot yaoi.