Don't worry, Natsuno. Alice may not exactly have gaydar, considering she's never encountered same-sex attraction much before this train (but is pretty used to it now, honestly), but she's so used to the way men look at her that she can absolutely tell who is interested and who absolutely isn't.

And Natsuno just absolutely radiates the latter.

Which is why she doesn't move away when he sits next to her like that. It doesn't even feel uncomfortable, having someone this close, although it often does for her. Thank god for Natsuno being so tolerable.

"Thanks for being willing to put yourself over discomfort to keep me from dying."

It's said a little dryly, but she does mean it genuinely. It's just hard to say it in any genuine way - it feels too vulnerable. So it comes out this way instead.