Invisible Cock Cage

As soon as the button is pressed, you feel a pressure on your cock. It doesn't feel too intense, but it grows until you're squirming in discomfort. You look down at your dick to see that the phantom cock rings have disappeared, but you realize that your dick is... shrinking?! Sophia and you both watch, her in fascination and you in horror, as your fully erect cock is squeezed and pulled back into your body. Even though nothing is visibly present, it feels like your shaft is being crushed by a slowly tightening tube, and the head of your dick is being pushed slowly but firmly backwards. You try to grab at it, but your fingers find no grip as the shrinking continues relentlessly. The pressure is immense now and you can't help but groan loudly through gritted teeth and watch your manhood vanish.

It must have only been a few seconds that felt like an eternity, but soon the feeling stops and you're left, sweating and breathing heavily, to take stock of your transformation. The shaft of your dick has shrunk in length and been pulled back into your body so much that only the tip of your head is visible, sticking out like a little nub. The head meets your crotch seamlessly, and you can't see the sides of your cock at all. Your balls still hang below, swollen at the pending release. Despite not being able to see it, you feel your dick throbbing. At first you think it's just residual from what Sophia has done to you, but... no... you're still hard?

Sophia reaches out to prod your nub with her finger. You flinch, but realize it doesn't feel like anything. You reach down yourself, but can't find anything to wrap your fingers around. Frustrated, you try to pull on your nub with your index finger and thumb, but it doesn't feel pleasurable. It hardly feels like anything, which is almost worse as your horniness hasn't really decreased. Panic starting to set in, you rub around your tiny dick. "What did you do!?" you shout.

Giggling, Sophia replies, "This is what you wanted, isn't it? Now you should have no problem keeping your tiny little dick under control. No unwanted boners... no jerking off... it's perfect!" Something about your situation is incredibly arousing, but no matter how or where you touch, you can't stimulate your cock at all.