My party is currently playing Kingmaker and the religion of the country and that most of the party follows is Evening Glory, an undead deity of eternal love we adapted from DnD. I was looking for more things to incorporate into her when I saw the Marriage from Fear and Hunger.
It seems incredibly fitting with EG: All involved parts have to consent to joining and undead can take part on it.
For those who don't know what the Marriage is: It's a ritual in Fear and Hunger that joins two or more people who willingly engage in a "carnal act" in a ritual circle, if the ritual is a sucess the two creatures merge into one, uniting them for good in body and creating a "Marriage" (more than two create an Abominable Marriage, which is even stronger). It increases your overall power as it combines the skills of those merged, but reduces your action economy since you can still only take one turn in combat.
How would you go about recreating this ritual in Pathfinder?