Surprise her.
Shock her when she least suspects.
Serenade her, with your song of choice.

And just watch that smile on her lovely face get broader.

Reel her in that you right before her face.
Look her in the eyes and yes, be sincere as you romance her.
With her favorite song.

Some know, we can or can't sing.
But at this moment this should be the last thing concerning her.
While you reflecting on her all your undying love.

Serenade her with a known song.
Or be creative and makeup and original.
As you serenade her.