They strap her up

Randy found herself strap to a chair with her knees on the seat and her tits hanging out from the back as her ass face forwards.

Sui puts electrode pads on her ass and then slaps it, "There. All set."

"Good." Jen says approaching, "Ready for your punishment slutt."

"Yes, Mistress."

"Good." Jen shoves her cock into Randy's mouth, "Suck on my cock."

Randy starts to sucking on the cock.

"Hmm." Jen looks at Sui, "You're right. Not good with the sucking."

"Turn it up. With pleasure." Sui turns on the electrodes shocking Randy's ass.

"Hmm! Hmm!" Randy cries while she sucks on the cock.

"You better do a good job slut, your punishment is going to get a lot worse."