It’s not something I have personal experience with, but I would suggest breaking the ice by bringing some playful food play into the bedroom. Things he can feed you, and that you can eat off him.
If that goes well and he seems to enjoy it then bring up that you want to gain weight, and ask if he is okay with that. If he is, see if he would be willing to help you with it. Let him know you’d enjoy it. That gaining and him helping you turns you on.
Be honest and keep it simple. Don’t drop a bunch of stuff on him all at once. If it’s something he’s open to, let him direct the planning on how it will happen instead. Then work up to the more specific aspects of being feederism that you are into.
Hope things go well and you get what you need
If that goes well and he seems to enjoy it then bring up that you want to gain weight, and ask if he is okay with that. If he is, see if he would be willing to help you with it. Let him know you’d enjoy it. That gaining and him helping you turns you on.
Be honest and keep it simple. Don’t drop a bunch of stuff on him all at once. If it’s something he’s open to, let him direct the planning on how it will happen instead. Then work up to the more specific aspects of being feederism that you are into.
Hope things go well and you get what you need
5 years