Bellyempire:
Start very light and easy with fruit. Slowly work her into it. Feed her fruit then ***. Feed her what ever she wants then ***. In a true Pavlov fashion she will soon associate eating with sexual pleasure all together and you will have a feedee.
This advice is generally good, but what makes it manipulation is the secrecy and the intent to pavlov her without consent. Don't do that to people. Instead, just have open and honest communication, and let her have control over how much exploring she wants to do.
But yeah, ease her into it gently. Don't try to do a big stuffing or pick anything too heavy. Try to avoid the uncomfortable parts of feeding. I'd pick something light, like a dessert she likes. Then just hand feed her and pamper her as a part of foreplay. Do all the normal erotic things between bites, I'm sure you know how to take it from there. You can always work up to something more another time if she likes it. But do stop the moment she tells you she's full.
Unless it's a BDSM thing and she wants to be dominated. In which case you'll have to walk that tightrope of putting her in subspace while not overwhelming her.