DP Machine

"This challenge will be determined by your endurance," you say, smirking as you head to your bedroom. You just happened to purchase a fuck machine with a double-penetration style dildo (what a coincidence!). You haul the box out back into the living room and set it down. You open it up and take out the machine and dildo and set it on the floor.

"What is that?" Katherine asks, never having seen something like it before.

"This is a fuck machine," you reply, "When I put the dildo on the end, it goes back and forth and inserts the dildo into someone. That person is going to be you. If you let this dildo fuck your holes for fifteen minutes without cumming, then I will give you a point. Seeing as my dick is exhausted from fucking you girls, I think that should give you the win. If you aren't up for it, then I'll just have to let Emma give it a try, I'm sure she'll be down to attempt it."

Katherine hesitates for a second, clearly a bit scared and nervous at the contraption you have brought out. But she steels herself, an expression of determination crossing her face.

"No, I'll do it. And I'm going to win," she says, "Give it to me."

Katherine turns and gets on all fours to show her readiness, her ass sticking out and inviting, her bare pussy on display. You grin and place the dildo on the end of the machine. You don’t think Katherine has noticed yet that there are two parts to the dildo - one for her pussy and one for her asshole.

You scoot the machine over so the dildo is lined up with Katherine’s openings. She is facing away towards the wall, determined not to look and not to take any pleasure from whatever experience she is about to have. You pour some lube onto the dildo, readying it for insertion.

“Are you ready to start the timer?” you ask Katherine. She doesn’t turn her head but nods. You push the dildo right up against her openings and she turns her head suddenly realizing both her holes are being touched. You push the on button.