My wife has a clit piercing and used to work in an office in the city.
Its funny the mention of the heel thing, as that is exactly what she used to do. I thought maybe it was only her that did it. She used to tell me on the phone that she was doing it. As far as I'm aware she never came at her desk (I'd have to ask her), but she did used go the the toilets to finish herself off.
She was the only female in an office of about 25 guys so she got a lot of attention.
She does masturbate an unusual amount though. She told me a few times that she fingered herself if she was horny when stuck in a particularly bad Melbourne traffic jam. Sadly I never got to witness this.