I had this headcanon somewhere on this blog that I can't find now but I just remembered it and fell in love with it all over again, so here goes:
in the future/steddyhands AU, Stede gets himself a little swallow tattoo on both his wrists to represent both his husbands
he didn't know that the swallow tattoo is actually a naval tattoo symbolizing a major sailing achievemeng like sailing 5000 nautical miles or all seven seas etc, he just saw that both Ed and Izzy have this tattoo and decided to match...
Ed also got his tattoo to match Izzy back in the day
( also, apparently swallows can symbolize both deep loyalty and true love because they mate for life and being a sort of talisman of safe return home no matter how long or far you travel because swallows are known to find their way way home from great distance, and I'm having feelings about both these facts and Stede, Ed and Izzy having these tattoos as eventual symbols of their love and being each other's home/safe harbor )