It's almost certainly something the Void's doing. So, it might be figuring out what being sick means for a lark?

[She managed a little laugh, even if it made her wince and looked over at Tifa when she slid in close. For a moment she thought about scooting again, but no. She could let her friend get a little closer. It was a pity that she probably couldn't help in this one case, if only because Tifa wasn't the girl that Parsee was falling for, not that she'd quite figured that out yet.]

You sure you want to be this close? I'm thinking it's not catching, but don't want to share it.