Thank you for reading, please rate and feedback is always welcome. Reminder all characters are fictional and are 18 years of age or older. Note, there is some brief incest.
Ava and Jessica would typically walk home from school with the twins that moved in across the street. Some days they would split and head to their separate homes. Other days, they would all come over and study for a while. Even if the twins were with them, Ava and Jessica would now always have their traditional lovers kiss after walking in the door. They knew they could be themselves in front of them.
Today I happened to be sitting in the living room when my daughter got home. I watched her exchange her first kiss of the day with Jessica, as they couldn't express their feelings this way while at school. Nathan and Sofia also walked in the door behind them. Not to feel left out, Nathan took the opportunity to give his sister a kiss as well.
When they were finished, Sofia walked over and handed me two envelopes, while Nathan handed an envelope to each of the girls. Sofia mentioned, "We are passing out invitations to our 19th birthday party. Please wait until Linda is home and open the invitations together." With that, they headed back out the door to head home.
It was a couple of hours until my wife got home, and Ava was so excited to open the invitations, she barely let her walk in the door before presenting her with the envelope. My wife made her way to the couch to join Jessica and myself. We all opened the envelopes together and pulled out the card inside:
You're invited to Nathan and Sofia's 19th Birthday Party
This Saturday - Mingling starts at 1pm - Parker Residence
Do not dress up - Proper attire will be provided
RSVP with shirt and pant size on the enclosed card
Do not wear makeup or style your hair
Prepare to be wet
Linda speaks up, "Ah, how nice of them to invite all of us to their birthday party."
Jessica chimed in, "It sounds like a sex party, as I feel myself getting wet by just reading the invitation."
Ava took this as a cue, kissed her mother and me before she pulled Jessica by her hand and headed out of the living room. It sounded like they headed to her bedroom, as it wasn't long before we could hear moaning coming from that direction. I quickly filled out the cards with our information so Ava could hand it back to the twins the next day.
Saturday morning rolled around, and Jessica walked over from her house, prepared for a sleepover that night. Ava answered the door, not quite dressed, but then she knew the bra and panties she was wearing would turn Jessica on when she seen them. As soon as the door closed, they had their traditional kiss, especially since it had been an entire night that they hadn't seen each other. Soon Ava had removed Jessica's shirt and bra, and her own bra was off as well. After kissing and fondling each other in the living room, they headed down the hallway to the bedroom for more action.
I yelled, "No more than one orgasm this morning. You still want to be horny when you go to the party today." Who was I kidding; this was also a direction for me as well, as just thinking about what this party could be like was already making my cock hard. Thankfully my wife and I had already satisfied each other this morning, so I wasn't going to be super ready to pop right when I walked in the door.
As the time came for us to walk across the street, Jessica mentioned, "There are a lot of cars here, maybe this isn't a sex party?"
Ava answered, "Remember their parents are swingers. They most likely invited a bunch of their friends to party with them and the twins. I also remember this house has a large, secluded patio so we will most likely have part of the party outside, as today is such a beautiful day."
We walked up to the front door, which was down a narrow walk between the garage and another part of the house. It was protected enough that someone would have to be looking straight down the path to be able to see into the house or anyone that was answering.
Sofia answered the door, and we knew it was a sex party from the moment we seen her. She was wearing a very tight red leotard jumper that was completely see-through. The only thing that was giving her any sort of dignity were three well placed white bows, one over each nipple and one between her legs, covering her pussy.
Nathan walked up behind her wearing red brief underwear, but it was super thin and tight, so that you could also see right through them. The underwear was designed with a special projection on the front that his hard cock was in, and this also had a white bow wrapped around the tip.
After welcoming us, they opened a curtain that divided the entry from what should have been the dining room, but there wasn't a table. Instead, there were about a half dozen chairs and a wall of storage boxes. Each box had a label and a name on them. The newest label applied on top of multiple other labels from previous parties.
Sofia said, like she had said the same message multiple times before, "Please change into the clothes you have in your drawer. You can use that same drawer for your belongings, as this will also be the changing room as you leave tonight. Once you have changed, please open the other curtain to enter the house. This is a mingling hour, so talk to anyone you choose, but no touching during mingling. Also, keep an open mind, No still means No, there will not be any resentment or judging. No condoms allowed, as everyone has previously verified that they are on the pill and STD free with the cards you returned. Oh, you all look wonderful, and I look forward to seeing everyone later when we open our presents."
Sofia closes the curtain behind us and Linda comments, "I didn't know we needed to bring presents." In which Ava responded, "I think we are the presents for the twins. Look at what we must wear."
Each of the ladies held up a long white T-shirt. As they inspected them, they realized that the shirts were all at least one size too small. They each looked in the drawer to find that there was also nothing else for them to wear. I didn't find a T-shirt in my drawer; instead, I found the same style of underwear that Nathan was wearing, except in white.
I said, "Everyone, off with everything. There is no reason to be shy. Also, I need to watch just a little as I want to be sure that I fill in my outfit properly." With that, each of the girls took their tops off to reveal that each was not wearing a bra. Each then slid down their shorts and panties, before tossing the clothes into their respective drawers.
I also slipped out of my shirt and shorts, to be naked with the three ladies. My naked daughter came over and started to stoke my cock to give it that little extra helpfulness my solder needed to stand at full attention. Jessica also came over and assisted Ava in pulling the tight underwear up my legs. They paid particular attention to direct my now hard cock into the special sleeve that protruded from the front. I said, "Thank God that sleeve was there for my cock, this underwear is so tight that it would hurt trying to contain it otherwise."
The ladies then pulled the thin T-shirts over their heads. The shirts were very much too small for each of them, especially in the chest. If you stared long enough, you could see the breasts through the fabric, but with a general glance, they were not visible. This was not the same for the nipples, as each was poking at the fabric, trying to get out of their newfound confinement. They were still covered, but you could absolutely tell how erect and turned on the ladies felt at that moment. The T-shirts were very clingy and accentuated the shape of their bodies, especially the breasts.