I don't know why, but i think cheating stories are the right kind of story for most people.
They've got the perfect length, not too long, not too short.
They've got the ups and downs, the thrills etc.
And lastly, you take something with you. Could be a lesson or just an insight.(depending on how realistic it is)
Most of them are a bit cliche but that depends on the author so i suggest you read a blend of stories from different authors who write stories to tell stories not fap material.
P.S. i'm not talking about those stories that are purely made to be erotica or inspired by an author's fetish for humiliation/cuckolding.