Are there any good collections of feedee writings? I follow a couple of girls that write little things about feederism, but they generally are sporadic or burnout quickly unfortunately.

Agreed! Very curious myself.
I know Curvage Casey has decent description for her vids and stuff. I love when she writes about how uncontrollable her gluttony is.

She hasn't been active for a while but Obese Queen's stuff is really good: https://www.deviantart.com/obesequeen