that would be cute! vivyenne used to be "one of the guys" back in high school because she was the placekicker for the boys' football team, and not only does she have no idea how to flirt, but she makes a fool out of herself whenever any guy tries to lay the charm on her. if they've been tight for that long, she would be completely oblivious that he had any sort of feelings for her.
~jacie is also her younger sister so that could throw an additional monkey wrench of fun awkwardness!