Assuming you don't mind (or better yet, prefer) the humiliation and arousal also being perversely linked to weight gain, Maverick's "The Wicked Stepfather" is among the best--and darkest--stories of this sort I've come across. Definitely one of my favorites. Here are the links:
Part 1:
https://maverickthewriter.deviantart.co ... -314047638Part 2:
https://maverickthewriter.deviantart.co ... -314050183The weight gain / humiliation / arousal linkage (in a somewhat more lighthearted tone) is also central to much of KipTeiTei's work, such as the "Breakfast/Lunch/Dinner With Sister" illustrated series, and the "No Lunch Break" illustrated series. All of those can be found on KipTeiTei's DeviantArt page:
https://kipteitei.deviantart.com/