I'm not sure where you can find it. It might be in some local archives if it's a story specific to a certain region. Or it could be in a self - published work that's not very well - known.
If it's an online story, you could try searching for it on niche storytelling websites or forums where people share less - known tales. However, if it's a very private or personal story, it may be difficult to find anywhere publicly.
The 'suicide sadie original story' might be a tragic tale. Maybe Sadie was a character who faced extreme hardships, such as mental illness, family problems, or social isolation, which ultimately led her to consider or commit suicide. However, without more context, it's difficult to say for sure.
Archive of Our Own (AO3) is another great place. It has a very user - friendly interface and is known for having a wide variety of fanfics, including those related to Arthur and Sadie.
You can also check out Tumblr. While Tumblr is more of a social media platform, there are many fanfiction writers who post their works there. You can search for Sadie Sink fanfiction using relevant hashtags, such as #SadieSinkFanfiction or tags related to the shows or characters she's associated with. Sometimes, Tumblr users also recommend great fanfics in their posts or in fan - centered communities on the platform.
I'm not entirely sure specifically about the 'Suicide Sadie' origin story as it could be a relatively unknown or very niche concept. It might be a character from a local legend, a specific piece of fiction, or an indie creation.
If it's a book, you could try looking in local bookstores. They often have sections dedicated to fantastic fiction. You can also search for it on online book retailers like Amazon.
Besides the major fanfiction platforms, some smaller, fandom - dedicated websites might also have such stories. You can search for fan websites related to the source material of Sadie and Anubis. These sites might have a curated selection of fanfictions that could include the 'Sadie and Anubis pregnant' ones. Additionally, if you know any fans who are really into this pairing, they might be able to give you some leads on where to find these types of fanfictions.
Fanfiction.net is another option. There are many authors who post their works there. You might need to use the search function and type in 'Sadie and Anubis love' specifically to find relevant stories. However, the quality can vary, so it might take a bit of sifting through to find the really good ones.
You might try searching in local libraries, especially those with collections of folktales or less - known stories. They may have some books or manuscripts that contain this story.
Another element might be her family situation. If she came from a dysfunctional family where there was abuse or neglect, it could have contributed to her state of mind. For example, if she had an alcoholic father who was violent towards her or her mother, it could have led to her ultimate decision. Also, it could be related to a community that shunned her for some reason, like she had some sort of 'difference' that they couldn't accept.
Since it's not an official part of the One Punch Man canon, it's not going to be found in official manga or anime sources. You could also try searching on social media platforms like Reddit. There are often subreddits dedicated to One Punch Man where fans might discuss or share such non - canon stories. Just be aware that the quality and content can vary greatly on these platforms.