Your 18-year-old sister had been sick as of late, and had laid in bed for several days, snotty and ill. Your mother had taken care of her, bringing her warm tea and whatever small snacks your sister was able to eat. However now your mother had caught the sickness as well, and since your dad was away on business trip, you were the one who could take care of them.
As you were heading up towards your sister's room, with a tray of two warm cups of tea, you heard a slight moaning noise coming from her room. Poor girl must be in pain, but as you opened the door to her room, your eyes stood wide open in shock.
First, there was that familiar enclosed bedroom smell, as they haven’t aired out here in the room for quite a while, second it was mixed with the smell of sickness, fever sweat and running nose kind of, and something else too, a more muskier smell.
The source was lying in the middle of the dark room on a bed covered with a warm duvet, your little sister, however her face, snuggled into a big pillow, didn’t look like it was in pain, but in pleasure. She had closed eyes and her mouth wide open leaned back into the pillow with and arm holding a used tissue behind her head, you could see small strings of snot was running down from her nose, clearly, she was still sick. However, it was the vigorous motion that was happening in the middle of the duvet that caught your attention, her other arm was under the duvet and the bulge popping up and down at the crotch area made it clear to you what she was doing, your little sister was masturbating.
“Aaaahmmmmeeeeh.” She moaned, wiggling and stretching her toes, which made you notice; her legs were over the edge of the bed, sticking out of the duvet, she seemed taller. You had to interrupt her:
“Sis, what are you doing?” you walked into the room with the tray and stepped on one of the many used tissues lying on the floor, however the bed still creaked, your sister didn’t stop doing her business. She opened one of her eyes, half open, and looked at you lazily: “Sorry big brother, It just feels so good, and I have felt so bad these last couple of days, lying here, naked, sweating, hot and drooling.” She whimpered, sniffing her stuffy nose. “Ahm… o-okay, I will just leave your tea mug at your nightstand then and give you some privacy.” you wanted to be quick about it, but you walked slowly towards the nightstand while watching your little sister go at it, the smell got stronger and stronger as you got closer to her, she hadn’t showered in days, her one exposed armpit reeked exceptionally bad. With a hand covering your nose, you laid the tray on her nightstand and took her teacup off of it, however as you were doing this her panting and moaning got louder, her masturbation and body shaking more furious.
“Oh, oh, oh I’m, I’m going, oh! I’m going!”
She raised her legs, as if she was going to give birth, and held her breath with an open mouth so only the the wet schlick noises and bed groans could be heard.
“Aaarrghhheeeen!” she moaned loudly, as her whole body shook, clearly, she came.
Exhausted she threw her head back into the pillow in bliss and her whole body went limb like a ragdoll, the only sign of life that was left was her heavy breathing. This whole experience had been disgusting and awkward for you, and you were about to leave when something else happened to your little sister.
You heard it first; groaning and expanding noises which let your eyes back on your sister, and to your shock, you saw her expanding.
Her arms and legs lying limb, began growing longer and bigger, her feet moving towards you, and the duvet covering less and less of her sweating body. As her legs got thicker you could see between them, and her pussy which was getting bigger and fatter by the second, still wet from your sister’s exercise. Her boobs had now pushed away the top of the duvet, as it no longer could cover these big lumps of flesh who flopped right off to the sides. Your sister had slightly than less average sized boobs, and during her growth, they stayed in same proportion to her body size, but now they were massive compared to a normal sized person. Her head had left the pillow and was now pushing along the side of the wall, as she inched taller and taller, still with a blissful expression on her face and snot hanging from her nose. A creaking noise from the bed got more and more intense as your little sister got more and more massive, and finally it cracked on the middle, sending her jiggling, wide bottom to the floor. Her hips where wide, really wide, she had that from her mother, a fat ass, that only had gotten bigger as she went through puberty. It then finally stopped, and as if your sister had just woken up from sleep, she rose up on her big, bloated butt and rubbed her head, it was close to hitting the ceiling even with her sitting down, she must be around 13 feet tall.
She brushed away the duvet, which only covered her stomach now, and scratched her plump pussy, which spill out it’s drooling juices on the remains of the bedframe.
She looked at you, looking dead tired and sick, sniffing her nose: “I’m so sick brother, I just can’t help myself, I have been feeling so horny lately.” She rubbed her pussy a bit more: “I have just been in here, pleasuring myself, then suddenly *sniff* I found out I was growing each time I came.” You could really feel the heat of her body now, surrounding you as it was, and the foul smell of a sick, unbathed teenager. “Sis, we need to get you some help, this isn’t normal! I will go and get mom; she will know what to do.”
“No, please don’t tell mom about this, it would be more embarrassing that it’s right now!” your sister panicked. “Sorry sis, but you’re awfully sick and it needs to be treated!” but before you could get out of the door, you sister’s large hand grabbed your shirt and pulled you back in her room, facing you she said: “You have to do as I say! If you don’t, I will just masturbate some more! And grow bigger! *sniff* and I will keep masturbating and cumming until I’m big enough that none of you can stop me!” her face looked angry, but still tired and sick, her cheeks where red and you could feel the fever heat from her face. “Calm down, you’re ill, you need to relax before you do anything stupid!” you said. “Well? Are you going to do as you’re told then?” your sister growled.
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