Small story: I've never done it, but came close once last year.
I met this one BBW girl (I like my women BBW) off of OKCupid. She wasn't really cute and she wasn't ugly either. I mainly hit her up on the strength of her having maybe the biggest titties I've ever seen. Also, she had a decent personality, had three degrees and was a pharmacist. So I decide to give it a shot.
Upon meeting her for our first date, she was a little bigger than the pictures suggested but had dinner and had a good time. Later, even though I don't drink, we went to a bar, leading to a first kiss and going back to my place. I was just thinking we'd make out so I sat on the couch and turned on the tv as she went to the restroom. When she came back, she bluntly asks "so do you eat pussy?" Minutes later, I get some head and smash. First time, I ever smashed on a first date.
Next time we meet up, we are naked in my bed and talking. I tell her I've never eaten ass before. She's stunned and proceeds to get on all fours, pointing her ample ass in the air in my direction, wanting me to dive in. I'm laying there thinking "am I really going to do this?" She's just waiting there, ass in the air as things kinda get awkward as she's getting really persistent.
All I could do is get my arm around her ass, but I couldn't get myself to do it. I did eat her pussy that night but I couldn't eat the booty. It was weird to me.
In conclusion, despite a cool ass first date and a sexual appetite as strong as any women I've been with, she's had some annoying characteristics and ended it via text a week later...and I can't deny that booty eating demands didn't have anything to do with it.