"In other words, I'd have to try it myself if I was curious enough about it, hm?"

Look, that's just the logical conclusion to take away from what Natsuno is saying. But before you think she's totally crazy - or, well, beyond how insane she quite literally is--

".. Don't worry though, I'm not thinking about drinking blood myself. It seems rather crude if you have no good reason for it. Though I'm glad the train provides it for you if it's a necessity."