Photographically showcasing interaction between engaged couples helps establish the relationship. Conversation is natural and is easily photographed. At least for me.
When I'm photographing couples, I frequently provide gentle direction designed to move the subjects toward pleasing photographic outcomes.
And here's a cool engagement photography quote that is only tenuously connected to interaction but is all about Star Wars—so it's perfect.
The new high-tech Star Wars toys will be in stores any day now. The toys can talk and are interactive, so they can be easily distinguished from Star Wars fans. — Conan O'Brien