Jodie wondered how things had ended up like they had. She was at once surprised, horrified, elated and ... yes ... horny. She had just taken a shower and was sitting on the john drying her hair, wondering what to do next. She stared between her legs. Yes, there was definitely sperm oozing out of her pussy. She knew it was there, of course, and hadn't washed it out in the shower. But now, she wondered whether she should have done so. She thought back to the beginning of the night - the most important night of her young life - prom night.

As I got ready for the prom, I tried to decide what to wear. Not my gown, but what to wear under my gown. I was going to the dance with Ron Harris. That was OK, though I wasn't really super impressed with him. But he'd asked me and he was the captain of the football team, so I'd said yes. I knew by his reputation that he'd try to get into my panties, but that definitely wasn't going to happen. For one thing, I wasn't on the pill. For another, I was technically a virgin, having shoved only the handle of a hairbrush inside my soft teen pussy before. No, Ron was going home with blue balls tonight. Well, maybe I'd jerk him off, but that was all. I figured I could handle him OK. And my brother, Rob, was going to be at the dance too. In fact we were double dating. That was the only way our parents would let me go, since I was only a sophomore. But Rob was a senior and had his license. Besides, he was pretty cool for a brother.

I finally decided that the gown needed smooth lines, so I went braless and decided on no panties either. I felt deliciously naughty as I slipped on the satin gown and admired my reflection in the mirror. Not too tall, with breasts, but not mountains. My hips had swelled some over the last year and the dress hung on them nicely. Blond hair done up tall and complicated and makeup just right. My sky blue eyes stared at my image and I blew myself a kiss.

The prom was OK. Ron had been drinking before they picked him up and he was too drunk to dance well. Rob had danced with me a couple of times and plenty of other guys had taken their turns too. It was amazing how many guys would desert their dates to dance with me, and even more amazing to me that they'd let their hands slide down to my butt while their dates were watching. Men are such pigs.

Ron had snuck a pint into the dance too. At first I was pissed off about it, but as he got more and more soused, I realized I wouldn't have to fight for my honor. So after the dance we dumped him off at his house and then went out to eat. We met up with a bunch of my brother's classmates at the pizza place and suddenly I heard Rob inviting them all to come back to our house to use the hot tub.

Lena, Rob's date, laughed and said "Robbie, how can we use the hot tub. We aren't dressed for swimming!" Several of the other girls chimed in, agreeing. Rob wasn't deterred at all. "We're all adults here. The water will be warm and who needs a suit anyway?"

There it was. I held my breath as these too cool seniors thought about it. Lacey Henderson was the first to break the silence

"Well, I'm OK with that, but I want to go home and get some jeans or something to dress in after we get out. It won't be warm then."

I couldn't believe my ears. Lacey, one of the most popular girls in school, was willing to go skinny dipping in our hot tub with a bunch of other kids!

But when Lacey said that, the dam burst and soon everyone was planning on meeting up at our house. We went by Lena's house so she could get some clothes. She came out and her Mom came to the door.

"I told my mom we were going to party in the hot tub. I'm sorry, I didn't think it would be a big deal. But she got all up in arms and says I can't go. She says I have to stay here since the prom is over."

She was crying and I actually felt bad for her. Rob took it like a man, though, and we drove off without her.

I thought this might have bummed Rob out, and that the party might now be cancelled, seeing as how he was now date-less. I said as much and he came back with "No way. I invited my friends over and they're going to get a party they'll never forget."

He had no way of knowing how true that statement was.

We finally got home and Rob went into the kitchen to make up some snacks. Our parents were over at the Wilson's playing cards, and we knew that those games almost always lasted into the wee hours of the morning, so it was no big deal. Besides, even if we were all going to be naked in the hot tub, what could happen in front of everybody else? I told Rob I'd go get the hot tub ready for our party.

"What do you mean OUR party?" he said, looking at me closely. "Little sis, this isn't OUR party. This is MY party and YOU aren't invited."

I just stared at him. "No way, you dork!" I yelled. "I went to the prom and I'm going to get in the hot tub and skinny dip just like everybody else!" My yelling didn't seem to bother him.

"Jodie," he said. "Calm down. You can't do this. Think about it. None of your friends will be there. All of MY friends will be naked. The guys too, Jodie. You don't want to be naked in front of all those people. And if Mom and Dad get home and find out I let you go naked with a bunch of virtual strangers they'll KILL me! No way, Jodie, I can't let you do this. I'm sorry, but no go." He said it in that way he always talked when there was no way to change his mind.

But I'd been his sister for sixteen years now, and I knew how to handle him. "OK," I said, sounding miserable. "But this is going to cost you big time." He muttered something like "Yeah Yeah," but I wasn't listening.

I was moving.

While he got snacks ready I did an end run around him by simply going out to the back porch, where the hot tub was, uncovering it, turning on the bubbles, stripping bare and getting in. It was aleady warm, because Dad has this thing about it being cheaper to keep the water warm than heat it up when it's cold.

Our hot tub was big. I mean huge. It would hold nine people sitting shoulder to shoulder and it was three feet deep in the middle. It was heated, like I said, and had something like fifteen jets in it. When you turned all of them on at once it made a mini storm and water slopped over the sides sometimes. That was OK, though, because it had an automatic fill thing that added water whenever it was needed. And it had underwater lights. I left them off, though, because I didn't want anyone to see me.

It was a really nice night. The air was chilly and the water nice and hot. I sat down on the side closest to the house and slid down so my head was almost under water. Rob wouldn't be able to see me until it was too late.

I must have vegged out because I was startled by a lot of splashing as several people jumped in the tub. The partiers had arrived and were piling in. My plan was going just fine. It was dark, and the lights from the house only hit one side of the hot tub. I was in the shadows.

Then I realized that the two people who had gotten in were boys, John Martin and Fred Dibble to be exact. I slid my head back up for a look and saw their dates standing beside the tub. Both had chickened out and worn bathing suits and both were shivering.

John yelled out "Come on in, the water's fine." As he did he stood up. He was naked.

Cindy, John's date, said "John, you don't have anything on."

Fred yelled out "Neither do I. That's the whole idea!"

About then two more couples arrived. At first they just milled around, seeing the two girls in bikinis. Then John and Fred stood up, showing they were nude and clothing started hitting the ground. I took this opportunity to check out the boys. There was just a yard light in the back yard, but I could see well enough to tell who was circumcised and who wasn't. I was a little amazed at how big some of those peters were, hanging down and flopping around as the boys moved around. Cindy climbed in the hot tub still wearing her bikini. One of the other girls did the same thing. But all the guys stripped down completely. My brother wasn't there yet. Pretty soon the hot tub was full of wiggling splashing teenagers. I was still keeping a low profile. I don't know if they didn't see me, or just didn't pay attention to me because I was "just Rob's little sister". At any rate, I soon felt smooth wet skin brushing up against mine on both sides of me.

Then I heard Rob as he came out the back door. "I've got eats here. I'll put them beside the spa for whenever anybody gets hungry. I peeked up. Rob was still dressed for the prom. He was peering into the dark spa, trying to see if people were naked or not. I don't think he could tell, but being a man of action he just started taking things off. Next thing I knew he was standing beside the hot tub, getting ready to get in. For the first time since he was probably ten, I saw him in all his naked glory. I was surprised. He was a hunk! He had those wide shoulders I knew about, and muscles I was well acquainted with because he pushed me around all the time. He had a nice tight little butt, too.

But what I stared at was his prick.

I used that word on purpose. He didn't have a penis, or a schlong or any of those other words that are all too soft. He had a big fat PRICK. It wasn't hard or anything, but I knew that if it ever got that way he'd probably pass out from loss of blood. It put all those other cocks I had seen to shame. He wasn't circumcised, but his foreskin was stretched over a big round knob that hung halfway down to his knee. I heard a couple of the girls gasp when they saw it. He stepped into the spa but all the space was taken up. People shifted, pushing closer together and Rob sank down on the opposite side from me.

"Who all is here?" he said as he settled in. I was safe. It was too dark to see all the faces in the crowded tub and now I was squeezed tight between Fred and Herb. People yelled out their names. I realized that Fred was on one side of me when he called out his name. On the other side was a boy named Herb Johnson. I kept my mouth shut, figuring I had gotten away with it.

Then Fred blew it. "And, of course, Jodie," he said loudly into the silence.

I heard one of the girls say "Who's Jodie?" about the same time Rob said "No, Jodie's in her room."

I elbowed Fred hard. Instead of getting the idea he yelped and poked back, sliding his elbow across my breasts.

"Jodie is Rob's sister and she's sitting right beside me."

Men are such pigs.

Now Rob was crossing the pool. He peered into the darkness between Fred and Herb. "Jodie?" he said in this voice I hated. I slumped down until only my nose was above the water. "Who is that?" he said as he got closer. Fred moved. Herb moved. Water sloshed and I got a snoot full. I came up coughing and gasping. "Jodie! I told you you couldn't come out here. Now GET OUT!" he yelled.

I was so mad I wanted to scream. But I knew I'd start crying and I didn't want to do that. So, with all the dignity I could muster, I put my feet on the bottom and stood up. Boy that air was cold! I felt my nipples stiffen up.

Oh, I don't think I mentioned my nipples. For some reason only a geneticist could tell, I have these ... odd ... nipples. While my breasts are only the size of soft balls, when I get excited my nipples grow and grow and grow until they stick out almost an inch. The first time it happened I was playing with them. It felt good and I didn't pay attention until they had grown so long I noticed them. I almost panicked. I thought I had maimed myself or something. Then it occurred to me that they felt just fine. Now I loved to play with them and pull on them. Anyway, I stood up, ready to climb out and my nipples went to attention in the cold air.

A boy hissed "Look at those tits!" That was followed by "Ooof" as his date elbowed him, but a circle of male faces suddenly leaned toward me. I realized that with all of them sitting down, the yard light was showing me - a lot. I looked at my brother. He was sitting there slack jawed, staring at my breasts. After all, he hadn't seen me naked since he was ten either. I had grown a lot.

Suddenly he burst into action, standing up. He put his hands on my shoulders and pushed me under the water "Get back down," he hissed. Now he and I were in the middle of the hot tub, surrounded by his naked and not so naked friends.

"Make up your mind," I growled back.

Fred called out "Oh let her stay, Rob. She can come back over here and sit by me." He sounded like he was grinning and I heard another "Ooof" as his date elbowed him again.

Another boy said "No way - she has to go." There was a pause and he went on. "Because I want to see her ass as she gets out." He laughed and his date pushed him under. Several of the other guys said I could come and sit on their laps and I thought Rob was going to have a heart attack.

Oddly it was the girls who saved me. Cindy stood up and said "Well if Rob's little sister is naked in this hot tub I guess I'll join the crowd." It got real quiet as she untied her bikini top and let it slide off her breasts. She whirled it around and let it fly off into the yard. Then she bent over and came up with the bottoms, doing the same thing. All the other girls who were still clothed joined in and soon the hot tub was full of naked frolicking teenagers.