We got dressed and went about the rest of our usual Sunday. Now that I could think more clearly, I realized that if I was able to get erect in this cage, then as soon as I was soft I should be able to just pull my penis out the back and I could masturbate whenever I wanted. But when I tried I found that I couldn't. As my erection subsided, the inside diameter of the rings seemed to sort of shrink along with it. It didn't leave any room for me to pull it out. I tried pushing the device forward, but the mesh connecting the three rings would remain stiff and it would barely move. I still wondered if I could just cut the fabric, but at least my hopes for the perfect evidence-free wank session were dashed. In any event it looked really expensive.
That evening, the cage started making an intermittent beeping sound.
"It's starting to run low on batteries. You'll have to keep it charged up to stop it from doing that," Emily told me.
"Oh." I said. It seemed so futuristic somehow I never considered that it must require electricity. "How do I do that?"
"I'll show you, but first lets wait a bit so you can see what happens if you let the battery get too low," Emily said.
The intermittent beeping continued for another hour. Then it became a continuous beep. It sounded pretty ominous.
"OK I guess that means it's almost out," I said. "Where's the charger?"
"Just a bit longer."
It kept that up for about another minute. Then I felt the fabric around my balls start to constrict until my started to ache dully. I quickly stripped off my pants and underwear and started pulling on the cage.
"Oh, shit!" I said, "Give me the charger!"
"Not yet."
The tightening continued. The dull ache transitioned into something more like real pain.
"It'll keep tightening until the pain is close to unbearable just before it really runs out of batteries. If it runs out completely, it doesn't require electricity to keep up that pressure, so make sure you keep it charged."
"OK! OK!" I cried as the pain started to radiate through my abdomen.
Finally, she pulled a charging cable out of her pocket. First, she plugged it into a USB charger outlet. The other end she just held near the cage and it pulled itself into contact magnetically. I hoped relief would be immediate, but the pressure on my balls eased up only gradually as the charge level got higher.
"In the normal passive mode it requires almost no electricity, but the battery doesn't last very long if it's delivering teases or orgasms since the device has only so much room for batteries. I got you this portable USB battery charger in case the power is out or you're not near an outlet."
She handed me a portable charger about the same size as as two packs of cards.
"You should even be able to charge with that in your pocket."
It was really only now that I realized just how much thought and planning must have gone into this whole endeavor.