I have a morphing, animated flame prop that I haven't been playing around with lately, if you want it. Still needs some work, though.

Reebo's Meshyard
The one-stop shop for all your big-pile-of-bones needs.

Fantasy 3D
Succubus, shackles

BadCo
Troll, little demon, forked tongue morph for Posette

SHAR3D
Demon character for P4 Male, demon horns, fang morphs for Posette

Ironclad Studios
Hanging cage, fang morphs for P4 Male, various weapons

RunTime DNA
More shackles, manacles, and weapons; some of the free gothic and Hunter items might be appropriate, along with various background/sky textures; ram horns for a bestial Tim Curry demon; lalverson's beach props (morphing terrain); hellish light presets

BAT Laboratory
Demon outfit (with wings) for Victoria.

Renderosity Poser Forum
EasyPose devil tail, horns, and catsuit texture for Posette (by Ajax)