April Fools' confession joke but make it murder-coded

A text message exchange meme featuring two characters from what appears to be a period drama. The joke escalates from a cryptic confession about killing someone to a casual agreement, with the punchline revealing it was an April Fools' joke on April 1st, followed by 'Dec 16' (presumably when the actual confession would happen). The characters' expressions shift from serious to knowing/amused across the exchanges.