I think I've always had it since I started developing libido, I started fantasising about girls' asses when I was 11.

I think I only really properly realised I had a fart fetish when some girl let one go next to me in the computer room. She was wearing really tight black trousers and she had a really big squidgy ass. She was also bending over helping this other girl on the computer. I was so turned on by it I felt a sort of sickness in my stomach for the rest of the day and couldn't stop thinking about it.

So I think I thought about girls farts before that but this situation definitely etched into my mind that I definitely had a fart fetish. Really my main fantasy before this was tight trousers or imagining myself really tiny and being dominated by a girl's ass.