Slavegirl gets to know how it feels when the electro box is placed on her butt cheeks

Mistress wanted to look how i would respond when the electricbox is attached on my butt cheeks. she has put it on my pussy before but this time she wanted to put it on my ass. she put the voltage very high. look how my buttcheeks are shaking. of course that was the only thing that i had go through. mistress told me that i needed some spanking first and not with her hands. no, with her whips!