Two of my favorite vore and weight gain games are Fatties Eating Fatties! and Project F.A.T. Not sure if they would suit you, but you can maybe check them out.
Alternatively, there’s some other possibilities on A user maintained list of games Two of the games on there (Fatty Text Adventure and Some Kinda Text Game) were really great in my opinion despite neither of them really being finished, but the shutdown of flash kind of killed those games.