I asked the elephant question. "What should we do?" We were quiet for a few minutes. "Nancy, long term in our marriages, we really can't decide in the next few minutes, or even the next few days. What I'd like to happen is to bring the wrath of their world on top of them."
"Good idea, most of my ideas were satisfying but criminal." For the first time today, John smiled. "I work in safety and there are many chemicals that could be added to the hot tub that will give them discomfort, but not kill them. I'll email you the different chemical MSDSs at work and we can choose. I've got a little stash of emergency cash and I'll get some video equipment that we can use with the cabin's wifi."
For the rest of the week, we planned what we would do to them if we caught them. The more I thought about it, I realized that if the marriage was over... later, not now.
The next weekend started out like normally. Fun times, relaxation, cooking on the grill followed by a card games and both Ron and Barb repeatedly refilling our glasses. John and I had massively diluted our liquor, his Kraken rum and my mix. As John and I 'got sleepy' we went to our beds. It only took a few minutes for the cheaters to go to the hot tub, strip and start their fun. They never saw the cameras. Once the motor of the hot tub had started, we left our beds and we saw them enjoying each other on our phones.
We raided their wallets for cash, took their credit cards, phone batteries, and their car and house keys. We only left Barb with harlot clothing and Ron was left with only BDSM sub attire. As John's car was last in the driveway, we quietly loaded everything in his car. Four tooth picks in the valve stems in my car left them with 4 flats.
It was time for the goodbye gift. John stood by the house main breaker and I snuck by the hot tub. They were really fucking up a storm doing doggie and never saw the pail of concentrated food additive quietly enter the water. In 30 seconds, all the water and they became bright florescent green. Walking toward the car, I heard the scream. John flipped main breaker. We drove away as a new stage in our marriages began.