I had to lookup the definition of the word "Fetish" to see if it meant a sexual obsession with something. It can but In the case of CDing I don't think the sexual aspect applies. Unless one is getting sexually excited in the process which would make tucking extremely difficult.
My son was concerned that his fetish of wearing soft female underwear would cause him to become trans like me. He said he only wore them for sexual gratification and that once the act was concluded he felt guilty about it. I assured him that there was nothing wrong with him. A lot of young men do that. It doesn't make you become trans or want to CD.