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This article approaches from a group psychoanalytic perspective the therapeutic encounter between the parities represented by a couple and co-therapists. We question the structuring of the couple from an anthropological perspective and hypothesize an evolution of a sacred link uniting the partners of the couple toward that of a narcissistic link. With the help of a clinical vignette, we illustrate the psychic groupality put to work within the neo-group thus formed, which implies a mobilization of the narcissistic systems. We specify certain aspects of the framework which implies the choice of a co-therapist, and we question the differences of such therapeutic work carried out in an institutional or private framework.