Passport, Post-it note, red ink
A small red heart drawn on a post-it note and placed inside the passport next to the current UK visa stamp where immigration officers look everytime Flávia leaves and enters the UK border.
[...] Nobody ever removed it or said anything. A few officers have raised their eyes to look at me, like when they check the passport photograph, but with a bit of a smile. Recently, the Post-it note was stamped by an immigration officer. [...]