You're caught

You're too tired to resist any more, as you're forcibly spread eagle in the clear depths, arms held straight out from your sides. The force, now with the upper hand, slows down and you feel a current flow sensually around your naked body. In spite of your terror it feels incredible and you're soon rock hard and dribbling wisps of precum into the surrounding water.

Soon the current slides down to your asshole, and you can only stare ahead in horror as you feel your hole slowly open. The sensation is strange and erotic; not like you're being penetrated, but like you've already been penetrated, and what's inside is growing larger.

Just when the stretching starts to become uncomfortable it stops, giving you a moment to acclimate. Then, the current flows in, and out, in and out like the tides slowly but all-encompassing, sending strokes of pleasure across every most pleasurable spot inside you. And yet, it's both frictionless and painless.

The current increases in speed, sending you to new heights of pleasure, and soon you're desperate to cum. A second current wraps around your cock, spiraling up and down your length, and it's not long before you're bucking against your invisible restraints, fouling the water with your cum.

The bubble around your mouth pops, but instead of water rushing in you feel it rush out. Before you can even think about how strange that is, you feel yourself slip into unconsciousness...