Miss Tiramisu:
I have dealt with eating disorders before, but they are usually emotionally linked. So the more stable I am, the more stable they are.
I hope that you still find joy in being able to eat and gain!
I want to add that while you can safely gain without triggering your ED, it's imperative that your feeder(s) give you the proper support. They need to give you space to enjoy yourself while stepping in as needed.
What that looks like varies from relationship to relationship (even if it's just a feedist relationship). For some, that might mean mixing healthy food with junk food, encouraging light exercise, or occasionally taking breaks.
You seem to be interested in extreme feedism. It's the riskiest kind of feedism, so safeguards are extra important. A good feeder will always keep your well-being in mind, but you also need to advocate for your needs.
I bring this up because it's really common to get lost in hedonism or for one person (often the feeder) to ignore limits.
I'm not saying this to rain on your parade. I hope you get very fat and enjoy yourself. I want you to enjoy your fatness for many years to come.