I love the idea that Seth just accidently rizz her up because he's too dense to realize it.
It is pretty hilarious how direct and smart he can be and yet at the same time so dense. The artist made a good representation of his character in this wholesome yet hilarious comic imo.
Ah, so it's a call-back to one of Agnes's lines from the movie. And based on the tweet, it seems I'm far from the only one who didn't get the reference. :-)