We describe an interactive narrative system that embodies Object Oriented Prompted Play (O2P2). This means that behaviours, attributes, and crucially stories are attached to objects in the story world. The approach is inspired by children’s social play where narrative emerges from collaborative, improvised negotiation. The object oriented architecture is appropriate for improvisation, imposing little predefined structure. Our goal is not the modelling, understanding and generation of narrative but the computer aided support for the improvisation process from which narrative emerges. Although based on play and children’s material, we believe the system is applicable more widely. Ours is a pragmatic approach that strikes a balance between the culturally fundamental activities of ”play” and ”story telling”.