"How the hell would I know?" Grimmjow asked instead of answering, one eyebrow quirked and his body still bladed partially away from her. It was all still part of the game: bait and trap, turn and harry. His tone was neutral and nonchalant. "I don't know what the fuck you are beyond your human part. You're the best person for figuring all of that out, aren't you? Or are you no longer happy with just having everything be you?"
And then it was there - that faint grin that was more of a smirk. It was more readily visible since his Hollow mask was hidden from view, but that didn't stop the sound of outer teeth shifting and grating to match the expression.
"Of course, if it's really some sort of parasite.. I just might be able to help you rip it out." The Arrancar's voice fell back into that near-purr again and his grin widened. "I'm no doctor, though, so I'll might end up taking a few extra organs with it. Nothing you'd need. But I'll only do that if you ask real nice."