Two metal frames

You don't know what you expected to find in the back room, but it wasn't this. Two metal frames against one wall houses two... naked butts, held in place by lots of thick white cushioning.

"What in the world..." You mutter.

"Radical." Steve says, in awe.

"Are those..." You start to ask.

"Real? Yep." The bartender confirms.

"Why are they...?"

"They are there voluntarily. They're waiting to be fucked."

"Who are they?"

"This facility works on a strict basis of anonymity."

"So wait, you want us to fuck them?!" Steve asks excitedly.

"No, obviously not!" You blurt out. "That would be insane, right?" You turn to the bartender.

"He's actually absolutely right. These ladies have paid to be fucked, and I need someone to do the fucking. Ideally, at the same time."

"And how much will it cost us?" Steve asks.

The bartender blinks. "Oh, there's no charge. If anything, you're providing a service."

"But then... what are the rules?"

"Try to make them feel good, but to be honest, if you just want to focus on your pleasure, that's fine too."

"This is insane." You mutter, but Steve is already advancing towards the butt on the right.

"I like how fat this one is. I'm going to fuck her."

And just like that, he starts getting his cock out. What an animal.

The bartender looks at you expectantly. "Please, if you will, it would be much better if you do this at the same time."

"B-but I'm married!" You protest.

"So am I." Steve shrugs. "But you don't see me being a pussy about it. Speaking of pussy..." He begins to rub the tip of his rapidly hardening dick up against the unknown woman's labia in front of him.

You feel paralyzed. On one hand, this feels like a once-in-a-lifetime opportunity, and you really don't want to pass up on it. On the other hand, it would be cheating. Cheating on your wife who is somewhere else in this shopping center, completely oblivious to the sordid infidelity occurring inside the pub she'd left her husband at.