Sisdom
Sisdom refers to a dominant sister. It is a special case of femdom where the dominant and the submissive are in a sister-sister or sister-brother relationship. Usually the dominant sister is an older sibling, and she can be a minor or an adult.
An older sister can be given responsibly to look after her younger sibling (like a babysitter), and she might be also given the authority to discipline them when this is necessary. Sisdom can also happen in child's roleplay, e.g. when children play house in which they act out the roles of parent/child.
Sisdom is a recurring theme in spanking art and spanking stories. An example of a spanking novel that features sisdom (together with many other themes) is Der Flokati.
The term might have been coined by Micha on the artwork sharing platform Pixiv.
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