The ability to generate narratives is important for literacy development. Children with autism spectrum disorder (ASD) have been found to generate less complex narratives than typically developing peers. This pilot AB study was designed to investigate the efficacy of a brief intervention procedure to develop the macrostructure of original fictional narratives based on a realistic scenario in one child, aged 9 years 8 months, with autism spectrum disorder and language disorder. The intervention targeted the characters, setting, problem, feelings, and fix of fictional narrative. Intervention involved the use of macrostructure icons, pictures to support the generation of narratives, clinician modelling, and the participant telling the entire narrative each session. The participant received 12 training sessions of 4–6 minutes each and the intervention was effective. Areas for future research include implementation of a stronger research design and investigation of generalisation to fantasy-based fictional narratives.