Model: Kasey Chase
Part 1
The homework was boring and tedious. Mrs. Chen had given clear instruction that if this wasn't ready by tomorrow, there would be serious consequences.
"Fuck this!" her sweet ass didn't give her authority over him - he could always ask help from his sister, the straight A's student. As Mark stood outside her sister bedroom, sweet moans could be heard from inside.
Is she...? The words were stopped in its track. Kacey, the goody two shoes that have never held hands with a boy wouldn't be masturbating, would she?
Tock - Tock
"Kacey, I need help with-"
"Cumming!" the door was halfway opened when the cry from Kacey made Mark stop dead in his tracks, not enough to hide what was happening in her room. In front of him, his sister was edging on her desktop.
"K-Kacey!?" Her eyes were glazed, disoriented. Finally, after some seconds, they finally focused on mark - they were full of lust. The girl stood up, rested her back against the desk and as he licked the hand that had previously been playing with her vagina, the other one went to raise her skirt, given Mark full access to her sweet opening.
"What happen big bro? See something you like?"
"N-no... Sorry for interrupting." Mark ran to his bedroom, his mind running everywhere. He had seen his sister in a way that he never wanted to. As his heartbeat regularized, a thought come to his mind.
Big bro? Wasn't her the older twin?
Part 2
Over the coming days his once prude sister transform in a vixen - at school rumors started to circulate about how she would go to the bathroom in the middle of lesson in order to masturbate. These rumor Mark suspected were true, as he had heard her through the walls, at all times, specially at night.
In front of their parents she still acted meek, but he knew something was wrong.
Mark finally confronted her one night when their parents were in their own little date. Not one second after they went away, she had changed into a purple dress - or an oversized shirt. It was now or never.
"Kasey, what's wrong with you?" Mark shouted as she was walking by the white sofa of the living room.
The little succubus that was his sister turned around. "What's wrong with what?" She was smiling, she knew what was happening, but apparently she enjoyed the confusion on Mark face.
"With... this! Don't you see yourself, it is as if you are prancing around nude."
"Oh! But I'm nude." she said as she lifted her dress, "Nothing wrong with that-"
"OBVIOUSLY IS WRONG! I don't want to see my big sister cunt!" this was too much, Mark has exploded.
Kacey started laughing at his outburst, which soon turned to a fit of laughter. Mark remained there, trying to make sense of the situation.
"Man, I was sure I was the little sister, she doesn't have boobs!" Kacey said as he touched the small boobage of her.
"Kacey, what is happening!?"
"Name is Ron, I was an ugly thing until I found a coin, a little wish later, and I am this sweet piece of meat" Kacey proceeds to remove the dress and sits on the border of the sofa. "Secrets out I guess... Soooo, do you wanna fuck?"
"What?"
"A girl has needs, and I could use the help of my little brother."
"God no! Get out of her you sick fuck."
"Can't, don't know how... and even if I did..." he started masturbating right in front of you, Kacey fingers working her entrance, "I like it here."
"Fuck!" Mark went upstair, maybe he could do something, maybe if he finds that coin again he could return his sister back.
Part 3
The coin search has been in vain - no internet, no grimoire, no nothing mentioned the existence of a magic coin that could swap bodies (the porn stories online didn't count).
The hobo in his sister's body has made his mission to tease Mark, sending him photos of her alone or with her friends, normally partially nude, instigating to have sex with him, to profane his sister, his own blood.
Even now, with the hobo showering in the bathroom Mark knew what was he doing, after all he had sent him a photo not long after closing the bathroom door that made him think of the first time he looked at her naked body.
Mark was approaching his breaking point - it wasn't only the photos, he has been having wet dreams about her, waking up every day with his underwear covered in semen.
As the battery of his headphone died off, he heard the cries of ecstasy of his sister coming from the bathroom, he didn't know for how long he has been shouting, but he knew that this wouldn't end until he accept his demands.
Mark ran to the bathroom, entering without knocking first - after all, he knew what was waiting for him inside.
"You want to fuck! Fuck it, I will make you cry for mercy!" As Mark looked at Kacey's entrance, a smile appeared on her face.
Part 4
It has been some weeks, the coin never appeared, and what was supposed to be a one time thing, just enough to calm the libido of the hobo, had become regular sex sessions behind Mark family's back.
What originally started as pretty straight forward sex had become a constant one up of the hobo, searching for a high state of pleasure or climax - Mark didn't know and at this point, he didn't care.
The face of what was once his sweet, caring sister has become the face of a whore, a sex fiend wanting only self-satisfaction.
"C'mon, I want you to finish in my face!"
The worst of all, he wanted him like this - Mark had had more sex at this point in time than at any previous point. Even if he had to beg in order for the hobo to let Mark fuck him, it was worth.