Search for joiplay on google, visit their official website and download the main application and renpy plugin. After downloading these 2 applications, download the windows version of this game and unzip it using any app you find on playstore(example: RAR). Open joiplay, click on the plus icon on topright corner, go to the file of this game and choose the file which ends with '.exe'. After that....ENJOY!
You can similarly play handler hazing on joiplay which is a better game imo. It contains breast, ass expansion and weight gain. Some other games you can try are Sultan's Harem, Housewife Simulator, Chunky Cheerleaders, etc. All of these are available on itchio.
All of them are of the same genre that is weight gain, stuffing, bbw.