Why Can't They Have Both?

"Please just let us go," Heather begs, "We didn't do anything to you."
"It is not about that," the garbled voice says, "This is about you two learning a lesson."
"Whatever it is," Jenni interjects, "We have learned it already. Please, just let us go and we won't tell anyone about this. Believe me."
"I do not think that you have. The longer you try to stall, the longer it will be until you are released. I can make this night last for a very long time. Now tell me that you would like to take the next test."
"We...would like to take the next test," they both say with humility.
"Very good. Now, let me set you up for the challenge."

The second the voice stops speaking, the sounds of two doors opening from opposite sides of the room can be heard. A slow creaking noise follows. It is like someone pulling a cart. The objects appear to pull up right behind the two college co-eds and stop.

"This is a somewhat straight-forward test really," the voice says, "What just entered your room were two unique devices. They will be used to determine just how much you care for each other. There is also no set time limit for this exercise. This is purely at your discretion."

All of a sudden, a clicking noise is heard and a sharp pain goes through Heather's supple ass.

"Ow," she says in shock.
"What's wrong, Hea-" Jenni asks, before she too feels the same sensation, "Ow!"
"Not you too. What are you doing to us?"
"Oh, that little thing," the mysterious person says mockingly, "That, my dear, is the key to your test. You will be spanked by this automated machine. As much as I would love to do it to you in person, it might endanger my privacy and hurt my hand. So this is the best way for you. Now who goes first?"
"Please don't spank me," Jenni says, "I can't take it."
"I see. So you want me to spank Heather first then?"
"....no, I don't want you to spank either of us!"
"That is not an option. It is either you-" The click is heard again and another hard spank comes down on Jenni- "or it is her." Another hard spank is given to Heather's ass.
"I....I'm sorry," Jenni says, "I just...just can't take it."
"Je-jenni," Heather says remorsefully, "You couldn't....wouldn't do this."
"I don't...have a choice."
"Very well," the voice says to interrupt, "The choice has been made. Your spanking will continue until you give up and tell me to spank your friend there. Oh and just a hint. The more you writhe, the more it might distract you from the pain. Let us begin."

Before Heather can speak up again, the robotic spanking machine is re-activate and goes to work. After the first two spanks, her ass is beginning to get really sensitive to the touch. She tries to put on a brave front and does not scream. Considering her proximity, Jenni can see her face very well and read it. 'I'm sorry,' she mouths to her friend, who acknowledges her, but is too distracted to do much more.

(Oh my God, this really hurts,) Heather thinks, (Why am I doing this? She put me in this situation, after all. I should make her take some of this).

Her self-loathing is interrupted by the look on Jenni's face. A small tear or two is sliding down her beautiful face.

(I....I can't do that to her. I just can't. When is this going to stop? May-maybe he is waiting for me to tell him to spank her. I feel bad, but it may be my only option. Besides, I don't know how much more I can hold out).