The stationery world is sadly lacking in polyamory-friendly cards. A good relationship with a metamour, though, is a particular kind of special and deserves to be celebrated. Show your metamour some love!
Whether they are actually the most, or the most-among-equals, I'm sure they'd like to hear how much you appreciate them. The pun is just a bonus.
4 1/4" x 5 1/2" (A2)
Bright pink envelope included.