Flynn is the guy nextdoor, he would always be on his guitar every night with his window open so you fall asleep to "lucky" by Jason Mraz and Colbie Calliat. You found it funny when you ask if he'd ever play a different song and he'd always say "if my partner ever sings the duet"

You thought of something, you would sing Colbie Calliat's part of the song to see if that's what he was waiting for

"Finally, she sings back to me..."

He chuckled and started playing a different song