Answer: Not that big!

I emerged into the sunny front yard to see my kids already splashing and having a blast in their little pool. It was blazing hot, and they were dumping water over each other's heads and squealing with delight. Charissa was watching them with a warm smile.

I approached her. "Looks fun, doesn't it?"

"Yeah," she said, "it sure does!"

"Come in, come in!" my kids yelled at us.

"OK, OK!" I called and stepped into the pool. The water was shockingly cold on my bare feet, and I took a deep breath as I sat in the shallow water. It was refreshing, but it would definitely take a few minutes to adjust.

"Charissa, you too!" the kids shouted. She laughed and also stepped into the pool.

This is when I realized that the kiddie pool was not really intended for four people, including two adults. As Charissa sat down in the water, in order to leave room for the kids, she had to squeeze right up next to me. Her leg pressed against my leg, and her arms were touching mine. The slightest glance to my side gave a glorious view of her cleavage ... and let's just say that it's a good thing the water we were sitting in was so cold.

My kids had grabbed plastic cups from inside, and they were playfully splashing each other and the two of us with them. I relished the sight of water spilling down Charissa's chest and watching her shake with laughter as she tried to cover her face with her hands. We were both moving around as much as we could, bumping and grinding our legs and arms against each other.

At one point, I tried to grab the cup from my daughter so I could splash her. She pulled it away, starting a silly game where I kept trying to grab the cup and she kept moving around the small pool. This led to some interesting situations in which I'd be reaching across Charissa to try to get the cup and inadvertently brushing her large, soft breasts with my arm as I reached. She was still defending herself from Pete, so she was oblivious to the contact - though obviously I was keenly aware.

I managed to grab the cup from Stacy and pivoted around the pool to try to splash her. This left me facing Charissa, and as I reached for Stacy, I adjusted my legs so that they intertwined with the babysitter's. My foot was an inch from her crotch, and her foot was pointed right at mine. Pete was still mercilessly pouring water over Charissa, and I felt I could use the cover to cop a feel. So as I lunged repeatedly for Stacy, I moved my body forward a few inches. I pressed my toes between Charissa's legs and ground my own crotch against her foot.

The dual sensation was incredible. The soft fabric of her bikini bottom and my secret knowledge of her unshaven pussy blended with my keen awareness of her flesh separated from my cock by only the thin layer of my swimsuit. In my game with Stacy, I rubbed my cock against Charissa's foot a few times; to my delight, she didn't pull back. Indeed, in her own playing with Pete, she ended up moving her foot back and forth against my member, causing a hard-on that was impossible to hide.

Eventually, Stacy jumped out of the pool and ran back to the sprinklers, and Pete followed suit. Out of a sense of propriety, I extricated my legs from Charissa's, and we sat facing each other, our legs inches apart. I wasn't sure what to do about my erection. Covering it would be awkward, though leaving it on display would be embarrassing. I saw Charissa's eyes fixate on the bulge of my suit, and she smiled. I remembered my commitment to be nonchalant and "in charge," and I decided to break the ice.

"Yeah, sorry about that," I said. "Just a little tight in here."

She laughed, clearly embarrassed herself, and didn't say anything.

And then she was drenched by the hose that my son had disconnected from the sprinkler and pointed directly at her head. Charissa squealed and jumped out of the pool, chasing Pete and Stacy around the front yard. I relished the sight from my cool vantage point in the pool.

Eventually, the kids were exhausted and were ready for a snack.

"OK everybody, inside!" I called.

We hadn't brought towels and as we entered the front door, I reminded the kids of our house rule. "Straight to the shower, kids."

"OK!" they called. No one was allowed to drip water in the house so they instinctively left their suits on the stone floor at our entranceway and dashed off to get clean. Charissa and I stood in our suits, a surprised expression on her face.

"House rule," I said. "Maybe you can just turn around for a sec and I'll leave my suit here and hit the shower. Is that OK?"

"Yeah, OK," she answered. She turned her back to me, and with a deep breath, I plunged my swimsuit to the floor. She couldn't see me, of course, but standing naked only inches from her scantily-clad body and sporting a full erection was unbelievably charged. I wanted to reach out and touch her, to turn her around and wrap her in my arms and slide my hard cock deep into her folds. And to be honest, I almost did. But I pulled myself together, turned away from the stunning woman waiting demurely beside me, and went upstairs to take a shower.