[LessIsMore]

"I thought you like to go naked," my sister said to me.

"Shut up," I said.

"You can skinny dip if you want, Josh," said my mom.

"I'm okay," I said.

They let the issue drop. After a while, we all started to overheat. We got out of the hot tub for a break. My mom went into the house and filled a pitcher of water.

She came back out and set it down on the table. I was filling my glass when she said, "Now that our secret is out, I think I'll skinny dip if no one minds." She didn't give anyone time to respond and untied her top and peeled off her bottoms. I was stunned. "Come on," she said encouraging me, but I shook my head. "You're no fun," she said. "What about you?" she asked my dad.

"Why not," he replied. "I did used to like soaking nude before you kids were born." He pulled of his shorts. I saw my sisters eyes go to his exposed penis before she looked away embarrassed.

We all got back into the hot tub. My parents' nudity was covered by the bubbles, so the awkwardness started to pass. We couldn't stay in the water forever, though, and eventually it was time for another break. We all got out of the water to cool off, my sister and I trying not to stare at our exposed parents.

"I'm going to get some more water," said my sister grabbing the pitcher and going into the house.

As the rest of us stood outside on the deck, we started to get cold. "Back in the tub?" my mom suggested.

"I think so," said my dad. They both walked down the steps and sat down in the hot tub.

It occurred to me that if i skinny dipped with them, I could probably do so in the future. I really prefer to be nude in the hot tub. So, I pulled off my Speedo, tossed it on a chair, and walked to the hot tub.

My sister came back outside, set the pitcher down, and saw my swimsuit on the deck where I'd left it. She picked it up and asked, "Are you naked?"

"Yeah, so what?" I replied.

She looked like she was going to make fun of me, but being the only one still wearing a swimsuit she decided to say nothing. Instead, she dropped my Speedo and got back into the tub.

We all relaxed in the tub, no one saying anything. Eventually, my mom said," I think I'm done."

"Me too," agreed my dad.

Everyone got out. I saw the camera still on the tripod and joked, "Anyone up for another picture?"

My parents both laughed. "I will if you will," my dad said to my mom.

"I'll set the timer," my mom said going to the camera. I hadn't meant it seriously, but it was clearly too late to back out now.

We posed together laughing. Even my sister warmed up a bit. The shutter snapped. My mom went over to her camera and looked at the picture. "Let's do one more," she said.

"Wait a sec," said my sister. She walked over to the table. She paused for a moment taking a deep breath, then untied her bikini and pulled off her bottoms putting them on the table. My sister turned back to the rest of us and just sort of shrugged.

My mom set the timer again and ran back over. We all posed together as the shutter snapped again.

"One from behind?" suggested my sister. I was surprised she was opening up so quickly.

"Good idea," said my mom, who set the timer again. We stood arm in arm, naked bottoms exposed to the camera as the shutter went off.

We all laughed. My mom went back to the camera and looked at the picture. "This one's going in the album for sure," she said. Everyone just laughed harder. Surely she was joking, I thought.

Pictures taken, we started showering off. Then we went inside and got ready for bed. My sister and I share a bathroom that connects our rooms. I sleep nude, so I didn't bother to put anything on. She came in wearing a pair of pajama shorts and a shirt. I could see a look of surprise on her face, but she didn't say anything.

I finished brushing my teeth. "Goodnight," I said.

"Goodnight," she responded with a mouth full of toothpaste.

I walked back through to my room closing the bathroom door behind me. I went to say goodnight to my parents. I could see their light was still on from the hallway and the door was slightly ajar. I pushed it open.

My parents were on the bed, my mom astride my dad. The door banged against the wall as it opened, and my mom turned around. "Oh shit, sorry," I said completely frozen.

"Did you need something, sweetie?" my mom asked with my dad still inside her. She was short of breath.

"I was just going to say good night," I replied still too stunned to move.

"Goodnight," said my mom. "Sleep well."

"Goodnight," said my dad.

Finally able to move, I backed out of the room closing the door behind me. I went back to my room and shut the door. As I got into bed, I saw that I'd become erect. I'd walked in on my parents having sex once before when I was about 10, but they'd been under the sheets that time. I tried to go to sleep, but I couldn't get the image of my parents out of my head. I pulled a bottle of lube out of my bedside drawer, threw of the covers, and started to play with myself.

I'd been going at it for a while when I thought I heard something. I turned towards the door and saw my mom, still naked, standing there. I nearly jumped out of bed.

"Sorry," she said. "I guess this makes us even," she added with a laugh. "I just came to make sure you're okay, but clearly I need not have worried."

I just laid there too embarrassed to speak. Thankfully, she did all the talking. "I'll leave you to it. Have fun." She closed the door softly.

For a moment I laid there, but I was even more aroused than I'd been before, so I started going at it again. It didn't take long to come.