Wolfwood has a sort of connection with Vash, I think.
Generally, I try not to look at it too much that way because it feels like major 'ship wank to do that, but you certainly can read it that way (and I did when I suited a fic of mine XD). Between Wolfwood looking up at the Ark and wondering if he's imagining something, and Vash hearing Wolfwood talking to him on the Ark, it isn't entirely beyond the bounds. Because Vash reacting to Wolfwood - I only see two possibilities. Either he's got some awesome hearing abilities (which is likely, I'll grant you) and he's specifically listening for Wolfwood's voice (after seven months, that's a hell of a lot of faith in a friend), or Wolfwood is reaching him on some other level. And Vash is certainly telepathic, even if Wolfwood isn't, so I can run with some superficial degree of 'feeling' there.
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Generally, I try not to look at it too much that way because it feels like major 'ship wank to do that, but you certainly can read it that way (and I did when I suited a fic of mine XD). Between Wolfwood looking up at the Ark and wondering if he's imagining something, and Vash hearing Wolfwood talking to him on the Ark, it isn't entirely beyond the bounds. Because Vash reacting to Wolfwood - I only see two possibilities. Either he's got some awesome hearing abilities (which is likely, I'll grant you) and he's specifically listening for Wolfwood's voice (after seven months, that's a hell of a lot of faith in a friend), or Wolfwood is reaching him on some other level. And Vash is certainly telepathic, even if Wolfwood isn't, so I can run with some superficial degree of 'feeling' there.