So this isn't exactly a story, but Twitter I find is a good source for people reliving their pantsing stories, made better by the act you can actually see their profile picture and their friends reactions etc!
I've found three profiles that in their likes, have found and liked thousands of the better tales:
https://twitter.com/DjeanAimar/likes
https://twitter.com/McFakeSan/likes
https://twitter.com/Silverbel33/likes
I hope this is something you guys are interested in. Let me know if you find any similar sources!