Shortly after leaving the woman's house, Daniel and Jason parted ways and headed home. When Jason got home he was going to leave the cookies in the kitchen, but Kelly, his sister, came across him and, seeing the package of cookies, took them from his hand saying that she would keep everything for her.
Kelly went up to her room and Jason went to his. Jason felt like he was forgetting something important, but thinking about it too much felt tiring and he started to feel sleepy. He was falling asleep and almost asleep when he heard screaming from downstairs. He then went downstairs to see what was going on.
Kelly was fervently arguing with their parents, who didn't want to let her go out to meet her boyfriend (they didn't like him at all) and were also complaining about the clothes she'd put on for a date, a blouse with a low neckline and a mini skirt. But Kelly changed her mind and said she was sick. She then went upstairs to her room.
Jason's parents got a call shortly afterwards and said they were going to have to leave, so he would need to stay home to help his sister if she got worse.
After his parents said goodbye to him and left, he went to see if Kelly was okay. When he arrived in her room, she had the door open, being taken by surprise as her breasts were bigger than before, and even more so that her panties were falling on her feet while she masturbated sitting on her bed, not noticing at all Jason's presence there immediately, as she kept her eyes closed and moaned softly.
Kelly opened her eyes and saw Jason standing at her bedroom door. "No Jason, don't look at mmmmmm....." she said but at the same time she came, but she suddenly threw up and kept throwing up for as long as her orgasm lasted, a totally white vomit.
"Are you ok Kelly? Do you want me to bring you some medicine?" Jason asked
"I'm... I'm feeling weird. I feel something is not normal, but it feels strangely good." Kelly said
"Did it feel good? Don't lie to me, nobody throws up when they're okay. I'm going to call a doctor, our parents are going to kill me if I don't do anything." Jason said and turned around to get his cell phone, but Kally ran after him and held him hugging him from behind
"I said you don't have to, soon my boyfriend will be here and I'll go out with him. I'm just going to clean up the vomit in my room and change clothes that..." Kelly said, however while she was doing this she was rubbing her body against her brother.
"Stop it Kelly, don't rub yourself against me like that." Jason said but he found it strange that his sister's breasts seemed strangely much larger, and also lower and firmer than they should be.
"I'm sorry, I can't help myself. I just feel so good rubbing against you that I can't stop. I... oh, I think I'm going to come again. Ahhmmmm..." Kelly said and had another orgasm. Once again she vomited during her orgasm, the same white vomit as before, which now soiled Jason's clothes.
At this point, Jason recognized by the texture, color, and also by the smell, that Kelly had vomited an absurd amount of cum. Seeing his dirty clothes Jason's gaze fell on his sister's also dirty arms and he was shocked to see that she had no hands, her hands had disappeared. He then remembered the old witch and the cursed cookies he thought he'd only dreamed of, and then her warning to keep his emotions in check and his sister's argument with their parents.
Kelly lost balance and fell to the ground, immediately Jason looked at her completely scared. His sister also didn't have her feet at the ends of her legs anymore, and to make matters worse the top she was wearing had already slipped over what used to be her breasts, but now it was a giant ballsack.
"What's happening to me? I'm turning into something strange but still I can't st..." Kelly said as she moved, rubbing herself on the floor as best she could, and came again, this time the cum not coming out of her mouth like vomit, but being shot with more force up to five feet in front of her.
Jason was desperate and didn't know what to do to help his sister, whose arms and legs had now shrunk even further, reaching where her elbows and knees would be. Her ballsack had gone all the way down and was already in her crotch. He couldn't leave Kelly there on the floor, but he also couldn't take her to her room and put her in her bed, because she was very dirty and if she kept releasing so much cum through her mouth with each orgasm it would do a lot of damage. Jason then picked up his sister, and when he lifted her off the ground he noticed that her hair was falling out. It was hard to hold her, because they were both very dirty with her cum and she was not onlyhavier, but her body seemed to be getting more cylindrical and was rigid, not to mention that she was doing her best to rub herself against him all the way to the bathroom, so much so that she came again before they got there, causing a big trail of cum to be left behind.
Once in the bathroom Jason put Kelly on the floor. Her arms and legs had completely disappeared, her torso was almost completely cylindrical and some huge veins could be seen pulsing in her. She tried to say something, but she could only moan through her mouth, which now had neither teeth nor tongue. Her entire now bald, noseless head was turning red and stretching forward.
No longer in any doubt that his sister was growing into a huge penis, Jason helped her change position so that her face was facing the tub. Then he left her alone, for he knew this was happening because she ate the cursed cookie that the old witch had given him, so he went to her room, took the shilling with what was left of it, and threw it as far as he could across the room. window, as he didn't want to risk someone else in the house eating them. He then ran back to the bathroom and when he got there Kelly's transformation was over and all he saw was a 6 foot hard cock, which had its base resting on a ballsack containing 2.5 ft in diameter testicles and the tip on the edge of the tub, which was filled almost halfway with the cum from another his sister had had while he was gone.
"And now what do I do? There's no way I'm going to be able to clean up all the fucking around the house before my parents get back, much less get rid of the smell that's in the air. And how am I going to explain turned into a giant cock?" Jason said to himself trying to find the way out, and then he was surprised by Kelly pulsing hard and precum jumping out of her urethra. "Can you hear me Kelly? Can you understand what I say?" he asked
The giant cock that was Jason's sister moved a little so that she managed to nod her head, confirming that she could hear and knew what had happened to her.
"Are you feeling bad about being a dick right now?" Jason asked
Kelly shook herself giving a negative answer.
"it's better this way. I was sure you were mad that you were turned into a giant cock because of me." Jason said
Kelly started pulsing hard, making her tip jump a few centimeters from where it was resting, and a lot of precum exploded from her hole. It was clear to Jason that his sister was furious and would be yelling at him a lot if she could. Amidst her furious expression, Kelly came again, her cum flying hard to the wall in front of her, where some of it splashed in all directions, but most of it just trickled down to join the rest and fill the tub almost completely.