It may or may not be a con with her to avoid CIM however in my early punting days I punted a parlour girl who had a latex allergy, she asked me if I wanted the oral with or without and in my early days I was a bit concerned about STI's from without so said with.
She then went on to tell me she had a latex allergy so had to do it without but wouldn't charge me the normal extra, no issue fucking her with a latex johnny just oral
When I make the booking on the phone , she says she does CIM, but with 5 minutes to go, she said because i`ve had a condom on and that she either hates the taste / has an allergy, she wont do it, so I said wipe it with the baby wipes but then said she doesn`t like the smell / taste of them on a cock.
I`m thinking FFS, i`ll just settle for her to wank me off.