Swim in the lake

Why not just take a swim? She thought to herself. That's what a beach was made for right?

She looked down on her body. Sweat dropped off her and onto the towel. She lost a lot of water.

"I'm going to take a swim for a minute to cool down." Kirsten said to Sarah. "Do you have any water with you by the way?"

"Yeah here you go." She said handing Kirsten the bottle. After drinking almost a liter she returned the bottle and carefully stood up. Her legs were like spaghetti, boiled in her own sweat. Her hands were wet as if she just washed them, and when she got up they got all sandy from the beach. Her feet became clumps of mud in the same way.

She took a look at the beach and saw nobody. Then she started her walk to the waterline. She felt the temperature with her toes. It turned out to be shockingly cold. Just how deep was this lake? But although it was so cold she still put her feet all the way in and stood up to her ankles in the freezing water. She froze all over but enjoyed it thoroughly.

She had her butt to the beach the whole time, and she probably wouldn't see it if there was anyone jogging there now. She also just didn't want to know. She had to be like this publicly and not care about it.

When she got a little more used to the temperature she took another step, now up to her thighs she was covered in freezing cold water.

Another 5 minutes passed and she no longer considered the water cold. Now for the big step. It was nearly impossible to take another step because having such freezing water on her labia would make her surrender instantly. Instead she'd now have to drop herself all the way in.

She took a breath and relaxed all muscles. Instantly she dropped to her knees and fell forward. Water engulfed her.

"-Ah!" she said from the cold. Her ass dropped below water, and she kept dropping up until her breasts touched the water. When it got to her nipples she reached the bottom of the lake. With her breasts now largely below water she was actually invisible again from the people that would walk by on the beach.

For a few minutes she bathed in the water until she was scared of getting hypothermia. She got up and walked ashore. But only then she realized Sarah wasn't alone anymore. There was a jogger talking to her.