Analysis of A warning sign

When my lips form charming smile
And in my eyes you see sunshine,
Be careful, darling, it's a warning sign.

Cause once sweet whispers touch your mind
And flirty laugh blurs track of time,
You won't notice that your heart is mine.

And when you watch the moves I make
And then you skip a breath intake,
Be cautious, darling, of heartbreak.

Cause once I get into headspace,
I live rent-free for weeks and days
Before I kiss goodbye and leave a trace.