You were able to get out of the water after collecting 10 fish, and placing them in a bucket without the help of a fishing rod, which was surprisingly faster than you could obviously manage doing. Just after putting your clothes back on however, you begin to feel something, which made you unbuckle your pants.
You've never felt a sudden sprout of an erection after a walk in a huge lake, but you began to feel weird in the crotch while you were sitting near the tent you, and your girlfriend have just set up together. You then see your own penis launch out of your underwear, and pants all together, while it was spilling cum on the grass, and you could see the shape of the entire thing change while you sat up. You could see it become a lighter shade of beige, and your testicles inflated to grapefruit sized.