Fics like The diaper blackmail.

A series of vignettes from the POV of a dominant sadistic sibling following the furthering degradation, loss of control, status and eventually potty training of their adorable victim sister after they decided through a careful use of social manipulation and blackmail, to force her to wear diapers first at night, then at school, then at all times, slowly getting her addicted to the pleasure of naughty diaper changes, warping her sexuality and fantasies to become fully diaper sexual and submissive. We follow the sister's attempts at clumsy rebellion, hindered by the fact that she suffers from a form of "Cassandra's curse" in that the more she insists she's not a bedwetter, the more everyone in her life believes she is, and is just ashamed of it. (Sweet and dark at the same time.)

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