have you read either of my other "incest" stories? (I thought that 'taboo trek" was incest but I didn't really consider the other one as incest until people started calling it such...) Is this the kind you're looking for, or something different? Let me know; here are the links
Say the girl spends her vacation with her aunt and uncle who has a private cabin at the lake. The first night there she can't help over hearing them having sex most of the night. The next morning her aunt and uncle act normal. After sunbathing, she comes into the cabin and hears them going at it again. The door to their room is half open and her curiousity gets the best of her. She watches as her uncle fucks her aunt like she wish she could be fucked. They notice her but pretends not to. Later that night she hears them going at it again, but this time in the main part of the cabin. She watches from her bedroom door fingering herself imagining that it was her taking her uncle's cock. Again, her aunt and uncle notice her, but pretend not to. The next day, down by the lake, her aunt conviences her to go skinny dipping with her after a pitcher of (you pick it). The uncle shows up later and the aunt brags about how beautiful and sexy the girl's body is and urges the uncle to feel hers and the girl's breasts.
That should be enough to get things started for your story.
Also I remember: some years ago, I read this one story:
There was this girl, she was really a slut. So her mother decides to send her to her uncle and her aunt to a remote farm so that she will turn to a normal girl.
She stays at the farm, but then she notices that her aunt and uncle are fucking like mad. She watches them at night and notices his big cock. The next day, she talks to her aunt, and the aunt invites her to a threesome.
So they do a threesome, and they are all happy, and the girl still is a slut.
In the end of the story, the girl and the aunt even have sex with a horse, even though the horse penis is much bigger then the one of the uncle .... pretty perverted.
Not really preverted. Someone thought that fucking a horse was interesting.
Lots of stories are alike. You just have to make yours interesting and a bit different.
I never cared for the animal bit. I have a cat, but she is just an animal and I take care of her. I don't like people abusing or misusing animals. But, a lot of people don't like incest either, so different strokes.