"Sisterly duties" might relate to responsibilities between siblings, possibly in a familial or metaphorical sense. "Futa" could be a Japanese abbreviation for female-to-male or male-to-female, commonly associated with certain adult content genres. "Lition" might be a typo; maybe they meant "litigation," but that doesn't connect directly. Alternatively, "lit" could be slang for something current or popular, but "lition" still doesn't fit.