This is a narrative study into the co-construction of teaching identities narrated by twenty-four undergraduate students in the context of an English language teacher education program in Argentina. Teacher identities are defined in the literature as co-authored stories of living and becoming. Our method uses narrative inquiry to study lived experiences as co-narrated phenomena. The narrative analysis of different texts gathered in the teacher education program allowed the co-composition of each participant's identity story. Results first display thematizations of identity strands in these narratives involving emotions--love, desire, imagination, and fluidity. Next, participants' negotiation of their processes of becoming through these emotions are retold. The discussion examines results considering state-of-the-art literature. The conclusions summarize the implications of the research for English language teacher initial university education.