The Lake

Jerry and his wife Tara loved hiking, they were almost every weekend out in the woods.
On one of such weekend they briefly lost the trail they were following and ended up in a wonderful lake. It looked luxuriant and fresh. They were a bit puzzled as the lake didn't appear on their maps, however they were happy with this unexpected development.
The day was hot and sticky and looking at the fresh water of the lake, Tara decided for a swim. She quickly undressed and dive in the water. Jerry followed suit, mostly attracted by his wife naked body.
After a couple of minutes, both started to feel dizzy and quickly stood out of the water, but it was too late. In seconds they morphed into the opposite gender.
The look of each other new naked bodies had a strange effect on the couple. Suddenly Tara's cock hardened and rose up, whilst Jerry's felt for the first time the moistening of his pussy.
Unable to resist their new urges, they literally jumped on each other. Quickly Jerry was on top of Tara, riding her like she did thousands of time before.
The sinuous' movements of Jerry were too much for the newly manned Tara, who after a couple of minutes was unable to resist and arched his back cumming for the first time.
The now reversed couple were just the last discoverers of the place known to the local Native Americans as the Lake of Shifting Winds.