Dina is a succubus - mostly using her human form but a succubus all the same. She's living a human life in the mortal realm with no one any the wiser as to her true nature, though a succubus never has to force anyone to be with them, no. Not when they are as savvy as Dina is, seeking the right scenarios and locations to find partners that, well, just mesh with them.
Still, a succubus needs to feed too, from time to time, drawing energy from sexual lust, and her transformation shocks her in the middle of an underground club, the rave going on around her.
It slinks into her body, shifting her skin to a shiny, black latex, winding deep into her core... But Dina does not wish to stop it, even if the transformation is, well, rather unexpected.
As hands grope her and men and women alike come in to see what she has to offer them, the succubus is ready to deliver.