If anyone's interested, There's this interactive on writing.com,
https://www.writing.com/main/interact/item_id/1389783-Fatties-Eating-Fatties-version-20, which is about fat woman eating other fat woman and has some chapters with pretty good burps. At the time of this writing, this interactive has 1,018 Chapters in it. One of the stories focuses more on burping and involves two girls, Nefertiti and Infelicity, who are roommates and students at Ransentis Academy for belching girls, a school that teaches young women about the art of belching. They're both very fat, very hungry, and very gassy, and their rivalry can lead to one becoming the other's meal. It starts here:
https://www.writing.com/main/interact/item_id/1389783-Fatties-Eating-Fatties-version-20/map/13. I've added a couple of chapters to it myself, though they are not as impressive the others; my chapters are
https://www.writing.com/main/interact/item_id/1389783-Fatties-Eating-Fatties-version-20/map/133222111 &
https://www.writing.com/main/interact/item_id/1389783-Fatties-Eating-Fatties-version-20/map/13322211122. So, if someone would like to check these out and/or add to the interactive, then please do so.
Also, sorry to promote my own work, but I have my own interactive on writing.com,
https://www.writing.com/main/interact/item_id/1895549-Belching-Girls-Multi-media-Vore--WG, which is about females from any form of media (TV, Video Games, Films, Animation, Comic Books, Et cetera...) or Original Characters burping and belching. Although there is not much vore in it, there is quite a bit of burps, big bellies, and stuffing. As of the time of this writing, the interactive has 866 Chapters. so it has some popularity. If you want to contribute to this interactive and add in some much desired vore elements, then please do so, though you should read and follow all of the rules and regulations on the title page.