Someone elsewhere pointed out that Cio's teeth (in both mouths) are blue, and that she might actually be asking Gog for a shard of her mask that's hiding on Gog's person, not a worm.
But Cio is clearly struggling to form words, so I imagine Allison thinks she is asking for a worm (and she might be doing that too, or there might be no blue shard on Gog at all).
Thus, Allison might take a worm just to save Cio from it, and that's how Allison gets wormed.
(Which, of course, also brings up the complicated question--if Cio IS asking for a worm, who is Allison to disrespect Cio's wishes...again...?)
Anyway. If Gog Agog was smart, she'd work with Allison without worming her. Because given Allison is prone to doing things she shouldn't be able to do, I would imagine it's a possibility that if Allison gets access to the worm-mind, SHE will take over Gog Agog, and not the other way around.
Regarding the White Chain scene, the editor in me wants to edit a bit of Abbadon's dialogue to make it flow better. In particular, the panel where Solomon David says, "Breathe, and you shall know it" and the one with White Chain's, "This body...I yearned for it". The dialogue between the two doesn't flow properly, it's a bit fumbly-awkward. I would've said the same thing in a different way. Probably would have put a pause on WC's face and had her say pensively, "I yearned for this body." The current usage of "it" by both of them doesn't sound right and doesn't evoke any sort of rhyme or rhythm as purposeful repetition sometimes does either, which is why I think it's an unthinking error.