Jen wanted to wait just a little longer. She tried keeping herself awake by going through her phone for a bit. Cassie's bedroom door had already been closed more than an hour ago. It was already about midnight, and both girls had been very tired as they came home. Jen already found it a challenge to stay awake, let alone her -younger- sister.
She stood up from her bed and walked out of her room, entering the hallway. She was looking for her sister's bedroom in the dark, staying as silent as possible, but luckily found it. Opening the door, she immediately got a view of her little sister, lying in bed. Jen sighed in relief. Cassie was fast asleep.
Jen sneaked towards her, taking a closer look. Cassie was lying on her side. Both her hands were supporting her head, but for the most part, it was also held in place by the pillows under her. Trying her best not to wake Cassie up, Jen gently altered her little sister's position in bed, so she could reach better for what she wanted. Cassie now lied completely on her back, mouth wide open, letting out an audible snore. For Jen it was only good news. After all, she didn't want to wake her up. She grabbed Cassie's left shoulder with her right hand -holding her left hand at her neck-, and tugged gently. Cassie's arm popped right off. Jen did the same process to take her right arm.
Jen smiled. She had taken Cassie's arms without her noticing, and made her way out of the room. Slowly, the stumps at the spots where Cassie's arms used to be, were already growing back again. She didn't really notice it though, she was still dreaming.
Jennifer was still awake however, and tripled back to her own room, closing and locking the door behind her. She turned on the lights, and put the detached arms on her bed. She knew Cassie had the ability to move her body parts even if they were detached, but there was no movement, not even a single twitch. Her younger sister probably had to be fully aware of having extra limbs, if she wanted to still take control over them. Now she was in her own world, and the only arms she possessed of, were those that had grown in the place of the old ones. The ones Jennifer... borrowed.
Jen gulped. It was still a creepy sight, those detached arms. They were cold at the touch. Jennifer held the left arm with her right hand, and lifted her own left arm. She attached the loose limb, and winced, immediately after. That terrible, prickly feeling! It could only be compared with an old television losing connection. She hated it. It was like cramp. It was obvious too though. She couldn't yet feel the limb as her own, it needed time to adapt. Just to get it over with, Jen quickly did the same with the detached right arm. A horrible feeling!
It took a few minutes, but patience pays off. Jen could feel the new limbs as if they were her own. It was a funny sight in the light of her lamp. Both arms were positioned right underneath her original pair. They were paler, and also smaller. She moved the arms in front of her and tested the hands. Everything functioned as if they'd always been there before. Amazing!
But testing wasn't what she was still up for.
With her original set of hands, she tweaked her nipples, them hardening in the process. Jen felt herself get aroused, still busy with two of her three boobs, she still had a pair of arms free. Not really paying attention to them, she felt her pajama pants shift, as two hands moved inside. She gasped as both her clits were assaulted by a set of limbs that shouldn't have been there but who cares? It wasn't like they were withholding her from what she wanted to do, masturbate...
What's better then thrusting your clit, you ask? How about thrusting both? Jennifer had moved all her hands to her groin, making really crowded. She let out double the moans she used to, do you even still wonder why? Everything had doubled, the amount of moans, the number of arms and hands, the pace of her heart rate, her breathing paired with it, and, "AH! *gasp* AOohhhh..."
she orgasmed, twice as quick.
The moan wasn't as audible, she was half lying under her own blanket, so the sound was muted. The orgasm did leave her in a state of ecstasy. Jen's muscles flexed uncontrollably with each spray of her own juices coming out of both her pussies, doubling the amount of it. It lasted long, longer than usual, but she wasn't in a mood to measure the time.
WHEN it finally ended, Jen came to her senses again. She immediately noticed to her disappointment that her night clothes were ruined, but was very satisfied with this new experience. That was it though, the feeling was fine, but she couldn't, and shouldn't, get used to it too much.
She wanted to sleep, normally. For that sake, she pulled off her new lower arms.
Or at least tried to do so.
They didn't detach?!
Jen realized why, so the panic wore of quicker than it appeared. It wasn't part of Cassie anymore. It was now only Jen's arms, and she didn't have Cassie's ability. For now she left it the way it was. After all, if she didn't want her younger sister to know about this, she could just exclude her from letting her know. In that case she would just recognize it as completely normal.
Jen turned off the lights lied down, covering herself with her blanket, and fell asleep. She could just as easily undo the changes tomorrow, after all, she possessed the curse right now, although it was more like a gift to her.