Toby and Maddie Arc/FicRecs

Tales of a Dreambender, chapter 67: Joining the Cult of Dad by Lady_Phenyx (link)

Maddie and Toby accidentally join either the Cult of Endless Hymns or the Cult of Dipping sauce. Cue hilarious misunderstandings and delightful shenanigans

Supernova by this_book_has_been_loved (link)

Twelve-year-old Maddie Pines is kidnapped by a cult and discovers that her adoptive father is the notorious Alcor the Dreambender.

Days of TAU Christmas, chapter 7: One of Those Days by ThisCat (link)

After Maddie learns that her father is a demon, Alcor talks to her teacher at school about how she's doing.