On my monthly dive through the archives of FA i found a weight gain focused visual novel that i have not seen yet on here.
It’s called “Soft Fantasies” and is created by Ziul Walls. It is in active development and updated every 2 weeks or so.
Description from Patreon:
Welcome to Soft Fantasies, A visual novel where you are a new college student on a new country, Mexico. in this novel you will know a lot of characters with different personalities. The trama goes about your body. You are a chubby boy who will decide what to do with your own body while you know more of each character and their likes. You can make each decision on this great new adventure! Come on try it!
(Disclaimer: I do not own this visual novel, i just to give it the extra attention it deserves)