Gaining

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.

Imagine if someone tried to help someone only to accidentally make them fatter.

For example, giving them a 'healthy' salad but they made it in such a way that it's worse than a cheeseburger.

I recall one Reddit story (so pinch of salt) where someone misinterpreted the Atkins diet and put on a load of weight.

I find accidental weight gain really hot. It's like they're becoming fatties just by being their natural selves.

I'm also really turned on by the idea of getting fat because of family. I think this is because my family is pretty anti-fat. Imagine having a family who teases you for being skinny. Every time you go to Thanksgiving or Christmas they ask, "when are you going to put some meat on those bones?" and keep giving you extra servings to make sure you walk out of there a pants size larger.

This!

The hottest is when a lady that has always struggled with maintaining her weight let's go because her lover wants her to gain.

She's submitting to her desires and her lover.

What is the hottest cause for someone who's been maintaining weight, to suddenly start gaining?

When they love being fat as much as I like fat.