“Together: cast the film of this friendship.”

A set-piece. One table, two pens, the same evening, one joint artefact. These are the pages people photograph.

Why this question

Who plays you, who plays me — and, crucially, who plays the supporting cast? Agree the title and the poster tagline while you're at it.

And once you’ve both answered

Write your casting on your own side first, then negotiate the final credits in the margin.

Answering it honestly

One table, two pens, the same evening. This one doesn't work by correspondence.
Argue about the details out loud before anything gets written down. The arguing is part of the artefact.
Finish in the sitting. A half-built set-piece has a way of staying half-built.

And the house rule, whatever the mode: leave a blank rather than write a lie. A blank can be filled later; a lie sits in the archive forever, and you both have to live with the paperwork.