Nikki accepted the invitation and let Emily get dressed to go to her room and choose her own clothes. "That's what you did to me isn't it? The natural way my sister acted and didn't notice her vagina being replaced by a cock. Even after witnessing it, it's still strange for me to imagine that the same thing happened to me." she said when they were alone
"And it was fun, wasn't it?" Jessica said
"It really was, I got more horny because of it." Nikki said, opening her wardrobe and looking for a dress, but she noticed there was a hole in front of them all, all in the exact same spot. "Why do all my dresses have a hole in the front?"she asked
"I was the one who did it. Even though I like being your dick, I don't want to be hidden inside your clothes when you go out, especially when you're having fun, so I programmed a change in reality so that at least my humanoid part is exposed and no one thinks that's wrong. No need to worry as there should also be some clothes for me too." Jessica said, and with that Nikki looked around until she found some tiny tops in her drawer that would fit the girl who was her dick perfectly.
Nikki chose a leopard print dress, letting Jessica choose next to the drawer with her tops after getting dressed, and her friend choosing a top with the same print as her dress to match. They left the room and found Emily who was already waiting for them. The older sister wore a violet dress with a revealing neckline, and underneath was the bulge that clearly outlined her cock, which Nikki noticed was bigger than before.
"Your cock is very visible through your dress, are you not going to do anything about it?" Nikki asked
"You also have a ten-inch cock like me and you know it wouldn't be easy to hide it, and yet I don't want to. If I had an intelligent cock like Jessica I would also leave the tip out like you. Now enough rambling, Eve and Tina must be tired of waiting." Emily said
The girls got out and went straight to a car parked in front of the house, in which Eve (the only one of them who already had a driver's license) was sitting in the driver's seat and Tina was sitting next to her.
"Finally you came. We were already thinking about leaving you guys behind." Tina said
"Sorry. I had to finish taking care of a problem that couldn't wait, but now it's solved." Emily said
"Seriously? I already know what the problem was." Eve said with a sly smile and looking at the bulge in her dress.
Emily blushed a little but didn't say anything about it, so she opened the passenger side back door and let Nikki in first, then got in so they could head to the party venue. It took them just over 15 minutes to reach a large ballroom, where the girls learned that Emily's classmate's cousin's birthday party was taking place. They hadn't been invited to the party, but that wasn't important and they went in as interlopers anyway.
After arriving at the party venue, when they got out of the car, Nikki noticed that Emily had something between her breasts, and looking more closely she noticed that her cock had gotten even bigger and the tip was sticking out through the cleavage of her dress. There were also huge bulges between her legs, which were the definite shape of her ballsack which was now huge as well.
They entered the hall and looked for a table, where they sat and had a few drinks while taking in the venue and the people at the party. Emily was having trouble drinking, as her cock was now 2 feet long and as thick as a soda bottle, leaving the tip at eye level and getting in the way of using the glasses. From the bulge in her lap, her balls were already the size of basketballs.
"Emily's dick keeps growing. How big will my sister get?" Nikki asked Jessica
"By the size that I programmed, you can believe that it will be bigger than you can imagine." Jessica said just as a guy asked Emily to dance and she accepted, going with him who didn't seem to care about her dick, which was growing in a visible rhythm.
After that, one by one they parted. Nikki and Jessica had fun at the party to the point where they forgot about Emily, only remembering her again hours later, when the party was coming to an end and the guests were already leaving. It wasn't easy to find her, as she wasn't inside the hall, so they went looking outside.
Emily was found in the parking lot and her condition was surprising to Nikki. She was naked and her dress was lying on the floor beside her as Eve and Tina, who were also naked, caressed her gigantic cock together.
Nikki was shocked to see her sister's 7.5-foot cock, which in length and girth was the size, and probably the weight, of a full-grown horse without legs. Her ballsack was not far behind, as she contained testicles 2 feet in diameter each.
"It was a shame I forgot, but it was worth seeing the end result." Jessica said
"Was this the size you expected? Don't yoy think you exaggerated?" Nikki asked
"Maybe, but she doesn't seem to mind. On the contrary, she's loving it and apparently you are too, I'm getting hard and I can feel it's not just because of me." Jessica said