I see. I still can't see Nel interacting in that way with anybody but Ichigo. Grimmjow treats every woman he's been around the same way he treats guys, brutally. D: He beat up Loli and Menoli, he acted neutrally towards Orihime but threatened her, stabbed Rukia, threatened to kick Nel like a football, and I think if they met, probably threatened the Tres Bestias.
Also, I liked Ichigo's interaction with Nel's real form when she was saving him. They really match well in my opinion. Even in the side notes of the tankoubon, it was shown that Nel likes Ichigo that way. D: