Mohini, the self-burning demon and the birth of Ayyappa
Vishnu as the enchantress Mohini dances a demon into touching his own head, and in Kerala tradition bears Shiva's son Ayyappa; the full record is I-4 in the interactions file.
Mohini first appears as the nectar-server at the churning; the demon-dance and the Kerala birth are her later lives. In the dance story a demon armed with Shiva's boon — a touch on the head reduces anyone to ash — turns on his benefactor, and Vishnu in his female form leads him through a dance he must mirror until he lays his own hand on his own head. The tale is told in Karnataka's Yakshagana and survives as a pose in Bhojpuri dance. In Kerala the same Mohini is the mother of Ayyappa: Shiva's desire at the sight of her produces Shasta, the child found on the riverbank by the Pandalam king, raised as Manikantha, and enshrined at Sabarimala. Mohini is also worshipped as Mahalsa in the west and gives her name to Kerala's Mohiniyattam.