I’m honestly surprised this game hasn’t made an appearance on here before. Its been around for a number of years and is extremely well made. Free cities is a slave management game set in a post apocalyptic world. You play as one of the new free cities’ leader and try to reshape society. But with sex slaves of course.
It was started by FC_Author back in 2015 and received updates up until January of this year where it seems to have been abandoned. In the base game you can force feed slaves till they’re fat and you can milk and breed them. You can do a huge amount in the base game including bimbofication, slave fighting, ect. You can either be harsh and feared or gentle and loved, there’s quite a bit you can do in the base game, but fat content is somewhat limited.
-Base game website:(https://freecitieslib.blogspot.com/)
Since FC_Author seems to have abandoned the game, a mod called Preg Mod has come out which includes a huge amount of new content. The fat content is much better, and slaves weight can range from emancipated to immobile. Descriptions of obese slaves are pretty good, and as a societal goal, you can mold your city to like gluttony and indulgence. Obviously pregnancy related content is the key feature of this mod, but it does much more for many other kinks and fetishes as well.
Once you download it, it just runs in the browser.
Edit: That third link is all you need, the whole game plus pregmod is in that gitgud. The link to the base game is just for anyone interested in playing the vanilla.