The key point you absolutely must understand, is that you enjoying her body doesn't necessarily translate into her enjoying her body. It's a puzzle you gotta figure out. Every girl is at different stages of self acceptance and self loathing. And I can tell you from a lifetime of experience, there are exactly 0 fat women on this planet who let you sleep with your face wedged into in their fat sweaty butt all night just right out the gate. But, if you ease her into it over 8 months or a year, slowly (NOT ON THE FIRST OR SECOND DATE YOU FUCKING HORNY AUTISTIC BASTARD'S), then 1 times out of 4 she will eventually learn to get off to it, and 3 times out of 4 she will indulge you and actually come to kind of like it....like it in a way where the may not actually like it like it, but if you are ever apart for any length of time she will realize she misses it and can't sleep without it anymore. There's a small percentage who won't ever learn to enjoy it no matter how suave you are, but you should have broken with them on the third or forth date anyway, to be honest
If you come in too hot, too blunt, you're gonna make her skin crawl. Do not be the FA that is so autisticaly enthusiastic about fat that you cause your girl to walk away from the relationship permanently unwilling to ever date an FA again convinced they're all creepy weirdos. Be the one that brings another fat girl into the world where they accept themselves as sexual creatures.
And yes. I get it. It's frustrating and isolating and annoying and alienating to have to do this... and it took me years... YEARS to understand this. But for almost every fat girl there lies hidden the correct combination of words, facial expressions, and tones of voice that can absolutely rewrite a girl's brain into being a full blown feedee.
It's a skill that takes a lifetime to develop. Step 1 is stepping out of the closet and actually dating fat girls. Congratulations. You've done this. Most guys never even get to this point. Step 2 is probably messing up for a little while as you get your sea legs and learn the ropes. But once you clear that skills gap, you're pretty much golden.
The two greatest skills an FA can have are this:
1: how to work the fat to penetrate deeper
2: how to make her love her fat