A few of my darker fantasies
Adding ghreline to everything you eat and drink, without telling you. Ghreline is a hormone that'll tell your body it's hungry and to keep eating
Tying you up and properly force feeding you. That means that the tube doesn't just go into your mouth, but all the way down to your stomach, so I can always fill it to the brim with weight gain shake and you have no way of stopping it
The good ol' making you cum your brains out while stuffing you until you get addicted to both junk food and orgasms so you'll lie around all day, gooning and stuffing yourself. It's be even more fun if you kept trying to quit but couldn't, because you can't get rid of your triggers (natural hunger and libido)
Having 2 similarly built subs, one to fatten up and one to keep skinny. I'd inspect both side by side, humiliating the fat one for putting so much blubber and praising the skinny one in front of the other for her perfect figure. To make it more interesting, the skinny one would constantly be surrounded by junk food as well, but if they surpass a certain weight or daily calorie intake, they'll be fattened as well. Y'know, as punishment for their greed
Being a vampire and using my abilities to brainwash you into the ultimate greedy sub while I fuck and feed on you as you grow beyond massive
Putting 5 subs into a cell, providing 25,000 worth of weight gain shake per day, and telling them that whatever remains left at the end of the day will be split equally among and force fed to all subs. It'd be fun watching them try fattening each other up, perhaps ganging up on each other. It's fun to scare subs with making them fat, while knowing that it's inevitable
