If you and a fellow writer are composição literária a collabfic together, who should be the one to post it?

Because I always have trouble when I write collabs with others on who should publicar it. Because we both do or don't care who does, and are all like "oh, you can post it if you want" and "Oh no, why don't you post it?" because we would feel guilty if we were the ones to post it, but at the same time jealous if the partner did instead...so, help!