The tips of Vammy's fingernails grew hot.  It wouldn't cause any permanent damage or anything but on sensitive feet it would feel unpleasant.   The demoness would tickle the captive's feet harder. The firey feeling on her nails would be the only thing the soles of the captive would feel.  "Now, perhaps you'd like to start us off with your name?"  The demon asked as one of her hands slowly moved towards the dark-skinned woman's rear and gave it a nice grab.  Her firey fingernails digging in a small bit. 

"Besides, I think whatever I'm gonna do to you is a lot more fun than whatever she's gonna do to you." The demon said as her hands moved up a bit, poking spots on the woman's body. Her back, side, shoulders.... Before they found them tickling the woman under the arms this time, her fingers still uncomfortably hot.  "Now~ Come on, speak up. I wanna hear your little secrets~"  The demon spoke into her ear before giving it a warm nibble.  "If you speak up, a nice little demon named Vammy will take [i]very[/i] good care of you~"  Soon enough, her hands would start to move... elsewhere nearby.  Whether the woman spoke or not.