A fun one! Yay!
I like the extra "sh"es on the subsequent choruses. I won't ask you where you got the idea for the song (per your recommendation--besides, it seems obvious), but I might ask how you came up with the "shshsh" idea. ??
I have a couple thoughts. I'm wondering about the word "Now" at the beginning of two lines so close together. It's only twice, so doesn't seem like a big deal, but when I first read through the lyric and came upon the second "now", it jumped out at me and I felt like I had already seen it too many times. Maybe just me, though....
And the bridge is so uniformly rhythmical until the last line, that it also struck me. You probably already have a melody that smooths it out perfectly, but--just in case you don't--"till" might work in place of "Until".
I really can't wait to hear this....
Vicki