[She notices the two of them in the reflection as well and gives an extra big smile to their mirror-selves.]

Yes, it’s a vocal piece with orchestral backing. The notes try to escape every year, but singing a piece with them keeps them in place. [It'd be easiest just to give him an example, right?] Mmm, I could try to sing you a bit of the Melody of Happiness, if you’d like! It’s a beautiful song, nya~