Apparently the NCSF (US) are typing to make 28 February into Metamour Day: a celebration of one's lover's lovers. While I'm not convinced that'll ever get Hallmark's interest, I thought it provided a good opportunity to sing the praises of my metamour, JTA.
I first met JTA 15 years ago at
https://danq.me/2019/02/27/metamour-appreciation-day/