Plagiarism in a recent top series

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So I read a series recently (An Unexpected Summer by joifiend11) which was great, but couldn't help but notice unbelievably similar details between that and the original story: Quarrelling with Kaylee by en_extase. I tried to message him but he didn't respond and worse, he has a Patreon, so he is making money off of what I believe is almost certainly plagiarism.

Overall, there is a very specific writing style where the sister is bratty, flirtatious, and playful all at the same time, and is full of sexual references and innuendos, emphasizing certain words in her speech with italics. Here are a bunch of the overlapping details from both stories that are exactly the same:
  • Both start with sister showing up from college and staying for the holidays
  • Both involve the sister being bratty and flirtatious while trying to get stuff out of the car
    • Making some comment about being a strong man before an unintentional physical contact that causes the guy to become flustered
  • The next morning, the girlfriend is asleep while the guy and the sister both have another encounter in the kitchen, where the sister is dressed scantily and she teases him about lack of sexual experience since he has been so loyal
  • That night, they all decide to watch a movie where the guy sits next to his girlfriend then the sister, who is again dressed scantily, sits on the other side of him. The sister starts secretly stroking the guy who fidgets - commented on by the girlfriend - while the movie depicts sex scenes
    • Guy eventually excuses himself saying he feels sick
  • The next morning, the sister confronts the guy while continuing to tease him physically, causing him to continue to become even more sexually frustrated
  • There's more in the ex_extase story, but then it goes right back to another encounter where the sister goes outside to the pool and has the guy spread sunscreen over her before basically performing sexual acts on him against his will and he eventually gives in only to be interrupted at the last second by the girlfriend returning which shocks him into rational thinking and feeling guilty
  • The next morning, he starts jerking off in the shower while his girlfriend is asleep, only to be joined by the sister who immediately starts to seduce him. It eventually escalates when the girlfriend wakes up and goes into the bathroom, not knowing her sister is is the shower. The guy and the sister start fucking while the girlfriend actively talks about her sister to the guy and he cums inside of her.
 
Report the story, using the "Report" button at the bottom of the text on each page. Let the site handle it from there.
 
Overall, there is a very specific writing style where the sister is bratty, flirtatious, and playful all at the same time, and is full of sexual references and innuendos, emphasizing certain words in her speech with italics. Here are a bunch of the overlapping details from both stories that are exactly the same:
The test of plagiarism is within the actual text, a side by side comparison that shows identical or near identical sentences. Your mention of italics is certainly a reference point, but it's the entirety of sentences that's the test.

The list of similar plot points might just be very lazy writing on the party of the second writer, stealing someone else's storyline.

As Stillstunned says, Report the second story with reference to first. The alternative is to do a text comparison of five hundred words or so - that would be enough to prove the case.
 
The test of plagiarism is within the actual text, a side by side comparison that shows identical or near identical sentences. Your mention of italics is certainly a reference point, but it's the entirety of sentences that's the test.

The list of similar plot points might just be very lazy writing on the party of the second writer, stealing someone else's storyline.

As Stillstunned says, Report the second story with reference to first. The alternative is to do a text comparison of five hundred words or so - that would be enough to prove the case.

Plagiarism goes beyond copying someone's text; rewriting someone else's story beat by beat is plagiarism, but it's harder to get people to care in that instance.
 
Plagiarism goes well beyond similarities or even what happens in a story. It has to be near identical (or actually identical) use of the same words in the same order. It goes beyond a sentence that is identical here and there.
 
Story links if anybody wants to form an opinion.

https://www.literotica.com/s/quarrelling-with-kaylee
https://www.literotica.com/s/an-unexpected-summer-pt-01

I only skimmed the opening scenes. As mentioned by OP, there are similarities at the outline level, e.g. both have a bit in the first encounter with the sister where she forces the narrator to ask her to help with a door. There are a lot of differences (e.g. closing car door vs. opening a screen door, second version goes on longer and is more obviously her fucking with him) and mostly the words are different, though I've marked a couple of similarities:

Quarrelling with Kaylee:
I rotated back around to bump the car door shut with my body, but Kaylee stood between me and it. "Could you, uh, get that?"

Her lips parted open, as if she was positively delighted to have been asked. "Oh! I'd love to!" She then unceremoniously kicked the door shut behind her with her foot.

vs. Unexpected Summer:
We had arrived at their front door, and I had given up on getting a word in edgewise. It was open, but there was a screen door. Summer stood next to it, looking up at me, expectantly.

I looked down at her. There was absolutely no way I could open the door, arms full of luggage. "Could you, uh..." I trailed off, nodding at the door.

Her lips curved into a smile. Even in the dim light, her expression -- and her tone -- were utterly bratty. "Say please."

I began to see why Jessica had warned me to be nice. "Please open the door." I had driven fourteen hours. I was tired. My arms were full of luggage she hadn't helped me carry. I was in no mood for this shit.

She pouted, now. "C'mon, say it like you mean it." She crossed her arms.

I rolled my eyes. My arms were starting to feel uncomfortable. "Please, Summer."

Her lips curved up again. "Mmm, you still didn't mean it, but that did have a nice ring to it..." She opened the door and stood in front of it, holding it open so I could go through.

"Unexpected contact" scene:

Moving toward the door, she deftly slid in front of me just as I stepped up to it. "No no, I'm not helpless. I wouldn't want the man of the house to be upset with me!" Her eyes sparkled irony before they were hidden away from her ducking into the back seat.

Her backside pushed out and pressed against my leg. I quickly stepped back to give her room. If she was trying to flirt with me just then, it didn't register. In my mind I just thought she was being a smartass. Anyway, I stood there by the car and waited while she continued to tug at whatever bag was apparently stuck in there. She made these cute grunting noises and I couldn't help but to notice her ass wiggle as she struggled.

vs.

I was tired of this, but I moved carefully. The last thing I wanted to do was smack her in the face with some luggage. I negotiated my way through the doorway, trying not to bump into her.

I mostly succeeded. As I was moving past her, I felt my knuckles and forearm -- wrapped around the outside of a duffle bag that had some of my clothes in it -- brush across her chest. The plush, round softness of first one breast, and then another, glide along my arm as I squeezed past her through the doorway.

Damn. Underneath that oversized sweatshirt, Summer had what felt like a very full pair of tits. I reddened a little, glancing back at her as I negotiated the rest of my way through.

From the little I read, it seems like the recent story is almost entirely original words; the two short parts I noted are short enough to be coincidence or perhaps an unintentional borrowing. (If it was intentional plagiarism, it seems weird not to have changed those bits as well - easy enough to do.) I also thought the two "sister" characters came across a little differently - Kayla's behaviour in this scene is subtle enough to be deniable, Summer is more blatantly fucking with him.

But if the rest is at OP describes, that does seem like more than coincidence and probably more than could be explained by unconsciously recycling elements from a story they'd read long ago. The individual elements don't seem too remarkable, the combination of all of them is more distinctive. It's more than I would be uncomfortable with in my own work but I'm not sure quite where it falls re. plagiarism.
 
It looks more like a case of recycling the plot than word by word plagiarism. Not cool, but also not explicitly against site rules.

Just leave a comment and vote whatever you think it deserves. Make sure readers (and the author) know about this story and the original.
 
Just because one story is like another doesn't mean its plagiarism.

The things you described are all common enough tropes in stories in that genre.

Now, if we're talking word for word, in sections that's a different story.

But I don't think that's the case here.
 
It looks more like a case of recycling the plot than word by word plagiarism. Not cool, but also not explicitly against site rules.

Just leave a comment and vote whatever you think it deserves. Make sure readers (and the author) know about this story and the original.
If that's what everyone did, then the site is going to blow up with "This story is like..." because there are a lot of very similar stories across the board here.

This isn't plagiarism, and to harass someone for having the same plot idea is being a Karen.

If people couldn't recycle plots there's be about 10% of the stories left on this site.
 
Actual plagiarism can be checked easily, even without an A.I. tool.

Sites like www.textcompare.org (you can web search similar utilities) will let you compare/contrast unbroken lines of tect strings for similarities.

I use Textpad to unbreak formatted text with a macro.
 
Actual plagiarism can be checked easily, even without an A.I. tool.

Sites like www.textcompare.org (you can web search similar utilities) will let you compare/contrast unbroken lines of tect strings for similarities.

I use Textpad to unbreak formatted text with a macro.
Any Word type software will do a text comparison and has done so for decades. You don't need to find apps or on-line utilities to compare text content.
 
Any Word type software will do a text comparison and has done so for decades. You don't need to find apps or on-line utilities to compare text content.
No. Not Writepad. For the longest time, MS Word was proprietary, so the options were limited. And MS Word (at least the version I had) doesn't do that.

The online tools can scan webpages and give results - something that doesn't require you to download a file to do checks.
 
Bro, I still use Win95 or 98ME for some ancient texts
Not to be snarky or anything, but saying "I can't compare documents in Win95" is basically like saying "I can't compare two stacks of paper." When people refer to features in Word, generally what they have in mind is a version from within the past two decades or so.
 
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