After John M. Ford’s death, Elise Matthesen (who lived with him) posted copies of “The Declaration”, a ceremony performed by them in front of a whole convention full of people. I’m pretty sure that, canonically, this constitutes a marriage covenant: promise of “till death do us part”, consent, witness of the community. If not, it’s pretty close. (It would seem simpler just to get married in such case, but fans never can do anything like anybody else….)
Anyway, if you scroll down, this posting also included her poem “Response”, which includes some very powerful Crucifixion and Rosary imagery related to Ford’s constant poor health. You might like to read it.