Hmm, it would have been a while back, about 4 or 5 years give or take. I'm positive it was on this website, and it was a multiple chapters. Unfortunately, I don't remember a lot about the overall story, expect the brief description that I wrote above. They were heading to the women's house I believe.
Overall, it was a pretty short story but did have a couple of chapters. It wasn't really forced diapering but slow regression with a lot of persuasion and tricks.