Seeing yandere+introvert combo here reminds me of an old one or two panel comic i saw a long time ago where the yandere tells all her usual cliched lines and crazy stalker restrictions about the guy not doing anything with anyone else, and the guy just being "well, duh!" then sexing her up until you have to wonder who is the actually crazy and obsessed of the two. I wish I could find that comic again, but so far I've failed.