You hear a splash behind you

Having been looking downstream, you hear a splash concerningly close behind you, but as you turn to face the noise, you are tightly held by two lean arms, a lightly muscled chest easily felt through your clothes pressing up against your back. You cry out, startled, as you feel yourself fall backwards into the water; before you can even think of putting up a token struggle, the shocking cold of the river surrounds you, wiping your mind blank.

Then.. it hits you.. the attendant.. they said the residue was in the water supply..

Warmth.

Lust.

Pure liquid desire rushing to invade your lungs, your nostrils, sliding along your skin itself like silk more than water.

You begin to panic as the chill of the water is completely displaced by the ramped up arousal far surpassing the paltry temptations you had faced before now. You thrash around, only then realizing your arms are free from the embrace of whoever it was that grabbed you in the first place.