Raven862 asked about this song from Miraculous Ladybug, so enjoy your request! I thought that after James ran off after being unmasked, Vivian could start putting two and two together about who the mystery singer was. She really did like it when they sang together before, even if James was acting really shy, but she knew that he didn't have to do something like disguise himself to impress her.
Vivian: There is only one thing this kind of damage can bring
The Secret Singer's shyness, am I right?
And look this gift wrap too, it's an important clue
It's from a present to him tonight
James disappears and the Secret Singer steps in
He must be working to protect him
My only explanation, my speculation,
Is that somebody bad is after James
It's a good thing I'm here, I'll protect him without fear
This boy that I secretly love
And with all of my might, I'll save you tonight
You're the boy that I secretly love
If you never know it's true, I'll be there for you
You're the boy that I secretly love
But what would you do if you knew what's true?
That's why I so secretly love you