A few things come to mind:

If you have a high metabolism, it can be hard to start gaining. This is normal. Once you figure out what works for you, it will get easier.

Take care of yourself. Getting fat doesn't mean you can't eat healthy foods or exercise. You can, and you should. If you build healthy habits during your gaining journey, you'll face fewer complications as you get bigger. Nothing will cap a gain faster than health issues.

Adjust your gaining to your wallet. Getting fat is expensive. There's the cost of food, clothing, and other various things that might pop up depending on how big you get and how you gain weight.

Have fun. Don't get so caught up in gaining weight that you forget to enjoy your body. And don't let other people put their expectations on you.

Looking for trans-specific stuff? Or general weight gain stuff? I can help with the second. No clue on the first.

What do you mean by "survival"?

Gives a whole new meaning to calling your belly a "tank". 🤣

Impressive. I do that with my hips all the time. My stomach's too flat for it to be worth it. But I wonder if my feedee does it.

An idea for later.

Domme feeder here. There's a lot of ways to go about it, but most of my advise boils down to two things:

Educate yourself on biology.

Don't be a jerk.

When you understand how the body works, you can make better choice on what to feed your feedee as well as how much and how often. You'll also be better prepared for how your feedee will change.

Also, be kind to your feedee. Respect their limits and boundaries. Help them when they struggle to do things. Be emotionally supportive. Basically, treat them the way you want to be treated.

Fetish? No. But it would be a fun thing to try with my feedee. I do have the body for it.

No, I meant the distance aspect. Since you didn't post this in personals, I'm curious if you had some kind of plan for that.

High key curious as to how this would work.