Help: Arching Text in After Effects

I’m looking for some helping in animating some text in After Effects. The text needs to start out as flat and animate to form a smile shape.

You can see my screen shot, where I have the logo template in black and the white text where I need to animate to form the curve. I tried the bend and warp tools and it’s not generating the correct curve. I also tried to create a pen path, where I got the text on the curve I want, but can’t figure out how to animate that pen path to be flat then curve.

Any help? Thank you!