In the second Buster's tounge touched hers, Katy's emotions ran wild. Vivid images of her unreal dream back at the college flooded her mind.
Without much further communication ("...gotta get some more sleep...") with her family she went straight up to her room.
Somehow she had to find... something. Something she had packed into her suitcase back in college. Something she hadn't remembered until Buster awakend a supressed part of herself. A part that had just recently entered her soul and now was growing stronger with every passing second.
Katy started to sweat... she had to find...
***
Sarah had always been very observant.
When she was a kid she'd been spying on her friends. She had sneaked and stayed in her parent's bedroom after they were asleep. She had watched her brother Cal and her older sister Katy whenever she had the possibility.
Her own life was irrelevant in her own eyes. Nothing special had ever happened to her and in her own impression of herself, nothing would ever. She wasn't as smart as Katy (so she would never get to college) or as handsome as Cal. Sarah was just the ordinary kid-around-the corner noone in her middel school ever noticed. She was unpopular in every facette. The boys didn't notice her and the girls had better things to do then waste their time with a weirdo like Sarah.
So the teenaged girl (she got 16 some weeks ago) had become a loner and kept most of the time to herself and inside her room, which lie directly between Cal's and Katy's.
This was the only thing Sarah liked about it, because as she grew up and the puberty changed both her mind and body, her observative hobbies got more intensive.
She had started to watch people engage in sexuality.
Her step from simple spying to serious voyerism began when she sneaked into her parents bedroom some months ago. She thought them to be asleep, but they weren't and it was a mere coincidence that neither her dad, nor her mom noticed her sneaking in. Sarah's parents were having sex and as she noticed that, everything inside her mind changed. She got so incredibly aroused that she fingered herself to a whimpering orgasm while her dad pushed his penis into mum's vagina over and over again. Sarah did not dare to move until her parents had fallen asleep, but when she had sneaked back into her room, she had fingered herself to orgasm several more times.
The next day, Sarah was alone at home, she drilled tiny holes into her room's walls which opened her a disguised view into Cal's and Katy's rooms.
As Katy was still at college, Sarah's next opinion in voyerism was Cal who's girlfriend just dumped him. He sitting in his room, not knowing that Sarah was observing his every move for hours. When he started to undress and then masturbated himself until his teenager cock spew forth long and sticky strands of semen, Katy again fingered herself into a multitude of orgasms.
Since that days, Sarah had gotten even more withdrawn from her family. She stayed in her room most of her free time and always used every opportunity to spy on her brother (no new girlfriend up to date, so Sarah could watch him masturbate many times) and her parents (not so many sexual contacts, but Sarah was sure to miss none of the few).
When Katy got home, Sarah knew that something interesting would happen.
***
Katy got home yesterday and Sarah had hoped her to do something nasty in her first night. But her sister seemed to be too tired and fell into bed as soon as she had entered her room for the first time for month. She got naked, which Sarah liked very much, but it was no fun watching her sister sleep naked without herself doing nice things to herself.
So Sarah had to watch Cal masturbate over a picture of Katy (he had never did such a thing before, but Sarah liked it when Cal got nasty) and got into bet slightly unsatisfied.
The next morning came and Sarah was dissapointed for her sister to leave her room very soon (she had spied upon Katy for some hours and waited her to wake up), but her sister got back into her room sooner then she had expected her to.
Sarah was surprised as Katy disrobed instantly and then dug into her suitcases in a hurry. She was searching for something, but Sarah could not guess for what.
Katy's gorgeous body glistened in a very slight haze of sweat and Sarah had to admit that her sister was very attractive. But she did not get aroused by the mere sight of her naked sister... some action had to happen before her body would react, Sarah knew.
Soon Katy seemed to have found what she was searching for. Her trembling fingers took a black leather collar out of one suitcase and with it a very strange looking dildo that was made out of some white, creamy rubber - after some seconds of thought Sarah remembered the dildo's appeareance to match the family-dog's cock... what was her sister up to?
Sarah, who was standing naked inside her room and peering though one of her drilled viewholes watched in fascination as Katy's trembling fingers put the collar around her neck and locking it in place there.
Her sweating and trembling seemed to get better just in the same moment.
Sarah watched Katy take a deep and pleased breath. She seemed to murmur something, but Sarah could not understand what.
Then Katy got to her bed and knelt down before it, her arms and upper body resting upon the silken bedsheets.
Sarah started to sweat some bit herself as she observed Katy looking at the dog-cock shaped dildo. Her sister was smiling in arousal and it seemed as if she'd ben addicted to the thing. Then Katy placed the dildo's topedo-shaped tip upon her wet tunnel's walls.
Sarah held her breath as Katy pushed the dildo inside of her as deep as it was possible. Then she started to push it in and out of her wet vagina as fast as possible, slightly grunting as she did so.
Sarah was in heaven. Her sister, who always was the family's best offsping (in terms of appeareance, choice of boys and school-success) had finally sucummbed to her own lust and seemed to be into some weird sort of zoosex or whatever.
It was incredible watching her older sister impale herself with this alien dick while wearing the dog collar. It heaved herself upon heights of arousal she hadn't known before. Sarah was fingering herself deeply before she noticed.
So Sarah did not notice instantly that something happend with Katy. She was too diverted with her own arousal so her observation of Katy was stopped for some crucial moments.
When Sarah (who had had some of her mightiest orgasms some moments ago) peered through her viewhole again, she nearly screamed in horror.
The dildo had fallen out of Katy's hands. Not because of her sisters arousal, but because her hands had become dog paws. Katy's body was growing fur all over it and her muscles seemed to shift and warp just beneath her skin. Her ears sharpened herself, her face seemed to push out... everything was in motion and even Katy's wet pussy was transforming into that of a german sheperd's bitch in heat.
Peering though the tiny hole, Sarah could only stare...