At its core, "sisterly duties" within the FUTA and Litton genres refers to the complex web of relationships and obligations that characters navigate. These stories often feature female protagonists who find themselves in situations where they must confront their desires, identities, and the expectations placed upon them by society and their loved ones. The term "sisterly duties" can be seen as a metaphor for the bonds of sisterhood, which are explored in a variety of contexts, from platonic and familial to romantic and erotic.