Vague memory of a story

[Giant-dude]

So basically there was a story I remember reading a long time ago, it was about a girl found be her younger brother I believe and he used her a bit as his shrunken cum rag, as well as forcing her to worship him as if her were a god, before finally deciding to step on her and kill her! I think the last bit of the story was him saying something like: “You better pray to your god, me! That you go to heaven” or something like that, then before he could crush her someone came in and saved her, saying something also like: “Oh my god- he- he- raped you” I can’t remember much other than it was a brother and sister dynamic and those two lines of dialogue that might not be 100% accurate. This is probably a long shot but just let me know if you have this story, it also wasn’t on any big website I don’t think, it was a link to a singular page with just this story kinda like a google doc. Hopefully someone can help