The first 30 minutes of a shoot is usually the warmup time when couples get use to being in front of the camera. After a little bit of time, they loosen up and be themselves.
It wasn't so hard for Maggie and Roger. I instructed them to talk about something funny while looking at each other. Although I can't disclose the details about what they said, I can tell you that I had to put the camera down a few times to laugh myself :P
I hope you enjoy their smiles!