Liammatthew159:
What's the best and easiest way to fatten a girl also I'm all for learning so please give me all the advice you can
1. Get to know each other and learn to love each other's non-superficial qualities.
2. Tell her you have a feederism kink. In return, show curiosity for her kinks and preferences.
3. Ask if she'd be interested in gaining weight. Accept whatever answer she gives.
4. If you didn't like her answer, and that would ruin the relationship for you, find someone else and start over at step 1.