For various reasons, he stays in the water

"Hey...?!" Jack was just on his way out of the water when he heard Kimberly crying out from behind him, and when he turned around he found her playfully fighting with Catherine further out in the lake. Apparently they'd found one of the big rocks underwater, which allowed them to stand up straight where the lake was otherwise too deep for them to reach the bottom, and now it seemed like they were playing king of the hill to see who could keep the stone for themselves.

Currently it was Kim holding her position above the surface, while tried her best to push her down, and Jack found himself watching them play with a mixed sense of interest. If the girls had been much younger he'd probably told them to stop right away, as they risked to slip and hurt themselves, but today there was something else that caught his attention, and caused him once again to glance around for other, eventual onlookers.

Unlike her older sister, Kim wasn't usually the kind of girl to dress up provokingly, but even so she did fill out her clothes much better than they were intended for. And this was especially true regarding the shorts she was wearing to the beach, as they were currently stretched tight across her bottom with the waterline just below, and in some ways they left even less to one's imagination than Catherine's skimpy little bikini.

While this shouldn't be such a big deal in itself, it reminded Jack with sudden clarity how one of his first dates with Shirley had ended up here by the same little lake outside of town. They couldn't have been any older than Kim was right now, and the sight of her short blonde hair and cute looking ass made him well aware of his own virility back then, as well as in the current day.

For this reason he was **** to change his mind about heading back up to the beach again, as it was much too easy to imagine how his own trunks would reveal his condition, in the same way as Kimberly's showed off her female curves. So he stayed for a while in the water, hoping that he'd find something else to think about than his daughter's lovely figure, but found it difficult while the girls kept playing around like that.

Eventually he decided to go for a swim instead, trying his best to ignore the girls on their rock, and simply focused on making it as fast as possible from one side to the other. This too didn't work for long however, as it seemed like his daughters had stopped fooling around by the time he was heading back, and he found himself joined by Kimberly, who didn't seem to have any trouble keeping up with his pace at all.

"Hey, are you going again?" She asked him when he reached the shallow end again, and grinned expectantly when he didn't immediately head back up to the beach, even if she couldn't possibly know about the full reason to Jack's hesitation. So he simply nodded instead, and hoped that she would go away if he didn't pay her much attention, but found her smile only growing wider. "So, are we racing then?!"

"Um..." Her father started to object, but realized that Kate had already tired and went back to the beach, which made his condition even more difficult to hide while she was up there and watching them. His only chance then was to wear himself out for now, and so he accepted the girl's challenge, even with a sinking feeling that it may lead to more than he bargained for.

And sure enough, Kimberly was just as fast a swimmer as he'd feared, which meant that she was constantly ahead of him on their way over to the far side of the lake. Even with the frothing water and her feet in the way he was still able to see her shapely ass every now and then, which again gave him weird associations while he chased her across the lake and back again.

Luckily she wasn't quite as durable as she was quick at least, which meant that Jack was catching up on the way back, despite having already done the same trip just a few minutes earlier. This raised his wish to compete just a bit, and he found himself smiling back at her when Kim suggested they would go with best of three.

Just like he'd thought, he was completely spent when they finally reached the beach for the third time together, and was **** to admit his defeat as Kim had apparently been preserving her strength during the second lap, so that she could beat him with a good margin on the last one. It did help him to get rid of his inappropriate hard-on at least, which was what mattered the most, and he really didn't mind losing a race against his daughter, when it proved she was actually better at some things than he'd thought of her.

In the end it wasn't such a bad way to spend his afternoon after all, and even Jack felt just a little **** to leave already when the two of them got back to the others at the beach. It was well about time for dinner though, and he feared that he'd eventually regain his vigor if he stayed much longer, especially with all three girls still dressed in their skimpy bikinis...