This is a really fantastic proposal story and I love that you negotiated it ahead and made sure the audience knew that it was negotiated as well.

Do you have the lyrics for the song up somewhere? I tried googling and couldn't turn up much and unfortunately the audio quality in the performance you linked + my auditory processing issues mean I can't really understand it. (The choreography alone made me tear up, though.)

ETA: ...also, ahahaha, I thought I'd included congratulations and then I realised I hadn't. Congratulations to you both! :)