Gemma was taken to the hospital in Margaret's car and Isaac went with them. Isaac's mother, who saw her son's girlfriend as if she were one of her daughters, stayed in the living room, anxiously waiting for news. Flora and Sophia then offered to clean up the cum left in their older sister's room.
The amount of cum left in the room impressed the two sisters, who had to take off several pieces of clothing and even change the bed so as not to leave any trace of the white liquid and prevent someone else from being infected. While cleaning Flora accidentally splashed some of the cum from one of Margaret's clothes, hitting Sophia in the face and chest. Believing that there would be no problem since it had only been on her skin, the youngest continued cleaning and only clean when everything was over. However, during the cleaning she sweated and her sweat made some of the cum run down and enter her mouth, too little for her to notice the taste, but enough to mix with her saliva and be swallowed.
After the cleaning was done, Flora and Sophia took a quick shower together before going to the youngest's room to wait for news together.
To alleviate the nervousness Sophia decided to do her homework and Flora was helping her. At first everything went well, but after a few minutes the younger sister could no longer concentrate on her homework, as she had begun to feel a strange attraction towards her sister. She tried to focus as much as she could, for always she went back to looking at Flora and feeling desire for her, which she found strange since she had never felt any such attraction for another girl before.
"Sophia, did you hear what I said?" the younger sister noticed Flora saying to her, but this had an unexpected effect on both of them.
Sophia felt a very strong urge to grab, more of a necessity than a desire, and she simply hugged Flora and kissed her her on the mouth.
Flora was totally surprised and it took a few seconds for her to separate her sister by saying "What do you think you are doing Sophia?"
"I don't know, I just felt a very strong need to... aaahhhh..." Sophia said when she felt something on her sides and looked, only for the sisters see her blouse being stretched and destroyed by four stretches of flesh that grew and soon became two new pairs of arms, followed by two more pairs of breasts that grew below her originals.
"Sophia, don't tell me you too... That time I hit you with your fucking Margaret clothes, it looks like you got infected too." Flora said
"I... I'm sorry Flora, I can't help myself." Sophia said, hugged her sister and kissed her again.
Flora tried to let go again but now that her little sister had 6 arms around her she was just too strong for that. She was hugged and kissed tightly, feeling her sister's tongue invade her mouth, but she felt Sophia's tongue getting bigger and thicker inside her mouth.
Sophia noticed her tongue was different and got enough control to stop kissing Flora and see what had happened. She saw when she took her tongue out of her sister's mouth that she was stiff and erect in front of her, but she didn't recognize the shape, so she looked to the side and saw her own reflection in her dressing table mirror that she had a hard dog dick coming out of her mouth, she also had something hanging from her chin, which she soon recognized as a ballsack. She thought about stopping everything she was doing with Flora, but again a very strong feeling of neediness made her push her new canine cock back into her sister's mouth.
Flora thought about asking for help somehow, but she could see tears streaming from her little sister's eyes and knew that she herself felt guilty for what she was doing. Soon she felt pressure underneath, something long and hard, which made her realize that Sophia had grown a dick between her legs too. Knowing what kind of trouble her little sister was going through, and since she'd already swallowed the precum from her dick-tongue and had probably been infected too, she simply surrendered and stroked the dick underneath her through her pants.
Sophia, feeling her sister touch the new member between her legs, stopped her kiss-fuck and said how can you, but still possible to understand "I'm sorry Flora. I swear I didn't want to do any of this, but the urge is just too strong and I couldn't go against it."
"I noticed you were very weird. Well, there's no turning back now, so I'm going to have to help you with your erections." Flora said
Upon hearing this, Sophia released her sister, allowing her to completely undress, while she took off her pants. In doing so she saw that the cock between her legs was perfectly human, was 9 inches long and had a ballsack with testicles the size of golf balls underneath.
Flora, when she finished undressing, lay down on the bed from where she looked at her sister who now had 6 arms, 6 breasts, a human dick between her legs and a dog dick that her tongue had become.
"Come on, I'm ready." Flora said
Sophia climbed into bed and got on all fours over her sister, positioned at 69 over her. She lowered her hips allowing Flora to suck her human cock, meanwhile she lowered her head putting her dick-tongue in her older sister's pussy.
While being double fucked, Flora watched the balls in front of her face and saw that her sister's new male genitalia had completely replaced her vagina. She then took Sophia's ass and placed her finger on her ass, finding her newly formed prostate and making her moan. She felt sorry for the situation, as well as she liked it a little, so much so that she thought it would be perfect if it wasn't for something done with her own sister and not contagious.
Soon Sophia stopped with her cock inside Flora's mouth, at the same time he buried her face between her legs with her dick-tongue fully stuck in her pussy, then she came, depositing her cum in her older sister's stomach and womb.
When her orgasm was over, Sophia turned and sat on the floor beside the bed, as Flora also sat with her head between her sister's legs, as her dog-dick-tongue had gotten knotted in her vagina.