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Based on my research on transidentity and in dialogue with the incest of “two sisters and their mother” of the French anthropologist, Françoise Héritier, I propose the concept of “incest between twins,” which can apply independently of sex and kinship as long as it involves a real or imagined “twinship.” Transidentity represents a “rebirth” on the fantasy level of a close relation, absent or deceased, with whom the individual shared a twin-like relationship, recreating this primitive and incestual fusion in a melancholic way, as did Pierre Molinier. Writing can also be a way to “resuscitate” the lost twin instead of embodying them in oneself, as the French novelist Annie Ernaux did with her sister whom she never knew.