Make an AI Photo Duo Lens with a friend

One prompt, two faces. You describe a scene once, and the Lens stages it for whichever pair opens it.

Sign in at easylens.snapchat.com and open the Gen AI suite at /assets. Photo Duo is the card that says Turn two people into one styled moment. From inside a chat you can reach the same tool with the Create an AI Photo With a Friend suggestion above the message box.
Open the card. Photo Duo asks you for one thing, a Concept, and its header says what that costs: an average processing time of 15 seconds.
Describe the scene the way you would describe a photograph, and name the two people by where they stand: "The person on the left and the person on the right as Renaissance portraits, cracked varnish, soft pastel colors." Left and right is how Photo Duo tells them apart, so use those words literally rather than names.
Step through the examples on the left of the modal if the blank box is the hard part. The Concept field carries the prompt behind whichever example you are on, so you can read a working one and edit it into yours.
Read the line along the bottom before you build. It prints the sentence that actually gets sent, Create a Lens using Photo Duo of… with your concept on the end. If that sentence does not describe the picture in your head, fix the concept rather than the Lens.
Tap Create My Lens. From there it steers like any other Easy Lens: send one follow-up prompt at a time to change one thing, "colder light and a darker background", rather than asking for everything at once.
Tap Publish when you like it, then open the Lens with the person it is for. Photo Duo is built for two faces at once, and every pair who opens it gets their own version of the scene.

You have a Lens that stages one described scene around two people, and a prompt you can rewrite for the next pair.