are we talking about all omake, or just yorusoi moments?
YoruSoi -
yoruichi finding ukitake pinned to a tree, and assuming he was just into bondage. the panel with her face looking absolutely devious as ukitake told her about soifon was just win.
Bleach -
Mayuri's game about being 'dyed in red'.
i actually have the entire bleach omake book thingy (dunno what its called) but its in japanese. if anybody wants it, just PM me and ill figure out how to share it XD