Go wash it off.

I laughed. "Dude, it's cool," I said. "We've got the world's biggest bathtub right outside. I'm gonna go take a swim and cool off. That was hot." I stood and went through the tent flap and out to the beach. As I walked through the moonlit sand, I decided I'd make it a skinny dip, so I removed my shorts. My cock was still semi-hard and the cool night air reinvigorated me, stiffening my prick again.

Then, only a few steps away from the water, I heard a voice behind me...