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Following our clinical encounter with a twelve-year-old girl, we propose the theorization of what we call “double transference.” First, we link this “double transference” to the psychic processes that organize the Winnicottian concept of play, a privileged operator in adolescent clinical practice. Second, we define this “double transference” using the figures of the Brother and the Sister. The brotherly-sisterly Double arouses two desires in the subject: fusion and murder of the double. Thus, showing an affective and instinctual evolution passing from Love to Hate, it becomes an originary process that enables the narcissistic and identificatory emergence of the subject.