Its a rabblelaid hard cuck story. Guys wife cheats with a guy who has a bigger cock, loves it to death, tells herself she loves her husband but never does anything at all to act like that's true, guy knows/suspects but does NOTHING to stop it. As the story goes on she becomes more and more corrupted by the big cock, says horrible things about her husband that he'll hear about at some point at the slightest prompting from the big cock guy. Husband is more and more humiliated. Etc.
If this is what you like then great. I like it to a certain degree but eventually as the story goes on it gets really old fast.