I read it as him seeing her realizing he needs to clean himself up (nose hair and change clothes) and she might be embarrassed to be seen in that state and giving her time to do the same. Fairly thoughtful.
Remember, don't take candy from strange lolis and definitely don't get into their windowless vans, no matter how much beer and video games they promise is in there!
It wasn't the smell part that surprised me, it was the primal hunger, that predatory instinct and the willingness to take what she wants, to take what she knows is hers.
This guy gets it.