We went out, Kittie said that she wanted to go to the nude beach out at Island lake, 20 minutes out of town. We got there, and after stashing my clothes in a locker, I met her just outside the locker rooms. I admired her sexy shape, out here in the light of day.
She whispered, "Damn, I'm getting so turned on, being in the nude, and knowing that I'm about to expose myself to a whole beachful of strangers, is making me horny!"
My cock had noticed, and I was right back up, hard, and eager. Thinking that it's probably very rude to walk down the beach with a full bore hard-on swinging around, we waited a few minutes until my cock had relaxed, then, we swung out of the locker area, and started down the beach.
We had sunglasses on, and I surveyed the people as we walked. It was a smorgasbord of bodies, all kinds, young, old, middle-aged, some very shapely, sexy bodies, some not so shapely, lots of pubic hairstyles, from thick tufts, to neatly trimmed, to bare and smooth. I noticed some people just glance casually our way, no leers or stares, everyone was cool with their own nudity, and ours, and I felt relaxed by the acceptance.
Finding a sunny, open spot, we spread out our towels, and I had the extreme pleasure of running my hands all over Kittie's nude body, caressing her supple skin as I stroked her down with sunscreen. I then felt the pleasure of her soft hands doing the same to me, and my cock rose up, and Kittie happily oiled down my erection.
Kittie giggled, and said, "We need to keep this guy protected, a sunburned cock would be terrible, I want your cock healthy and well, I have plans for you and your lovely cock!"
Laying back, with the sun shining down, my cock was again relaxed, and we lay side by side, just enjoying the day's warmth and closeness. My mind started to think, out here with my sister-in-law. Being sexually involved with her, with more to come, if she had her way. And damn it, I most assuredly wanted her to have her way. The situation could get very dicey, and it could wreck my brother's relationship with both of us. But looking at Kittie's awesome body, gleaming in the sunlight, I knew that I was going to take all that she wanted to give to me.
After a few back and forth flips, Kittie pulled me to my feet, and hand in hand, we dashed into the lake. The coolness of the lake water gave us a pleasant shock, as the heat of our tanned skin met the brisk, cooler water. Kittie and I love to swim, and we went out a bit further until the water was up to the top of Kittie's shoulders, so we could swim freely, without having to avoid people just paddling around in the lake.
After a while, we decided to call it a day. Before we left the lake, Kittie had me stand so my back was to the beach. Her hands reached down, grinning, and stroked my cock. She smiled as she could fondle me, the water and the angle of my body hiding her arms.
"Now, let's go home, and I will take care of that hard, horny bulge!"
Emerging from the dressing room, Kittie had put on just a tight bikini bottom, that was pressed tight against her smooth mound, and a halter top that displayed a lot more than it covered. I had just put on board shorts and a loose T-shirt, and I smiled as I saw Kittie, once again looking so wildly sexy, my cock also taking notice.
