I'm following the English Viz translation of the manga, so I've only recently gotten to meet these two (though I've been a bit spoiled because I couldn't resist some fic). I'm glad I have some background here, because this is delicious and highlights what I love about these two -- Grimmjow's wild, but not completely, and Ulquiorra's in control, but not completely, and they rub up against each other in all the wrongright ways. Yum!