I'm trying to find a story I read online a few years ago. Can't remember the title but it concerned a couple where he convinced her to let him experience spending 30 days as her prisoner in their basement cage (or maybe isolation cell) in a CNC context. It was fairly long and very well written. I seem to remember it did a good job exploring the physiological aspects TPE and how her feelings towards him changed over the month.

Ring any bells with anyone? I don't think it was on something like Gromet's Plaza