Gaining

Curiousv:
For me it's if she's already considerably fat, and loves eating, but she can manage (even if only barely) to hold herself back from stuffing herself all the time, because of being afraid of not being accepted.

Showing her affection and acceptance, as well as she gradually learning that I not only tolerate her size but love it, might make her to abandon her restraints, and start indulging herself completely.
I would feel somewhat guilty (even though I neither forced nor tricked her into it), but it is such a hot fantasy.

Thepiggygirls:
I like the fantasy of thinking someone is trying to help you manage your weight but then slowly after building a relationship and trusting them they begin to fatten you, slowly, so at first you don’t realise but then once you do you’re too addicted to all the extra calories to let it go, so I guess a bit of deception, but I think it only really works in a roleplay setting due to consent.

TheWhipHand:
The secret desire to gain, yet trying hard to “follow the rules”. My husband was secretly a little porker, a plump little delicacy waiting for someone to let him just let go of this insecurity and become the fat little man he is now.

It’s these secret desires that I find irresistible - I love to get them out of these.

AskDrFeeder:
For me it's when a woman has always wanted to eat a lot and get fat but is afraid to. Then she meets a feeder who helps her overcome her fears and start gaining. Then she finds she LOVES it and gets FAT.

CookNFeedin:
Giving in to the hedonism. When someone finally says either they want more fat for the pure joy of it or that they just decide they want to eat as much as they want and gain as a result. Either is great. Just giving into pleasure as the pounds pile on.