But don't forget ... just as there are some people like Jessica who look for genuine relationships (BTW, I don't see Jessica as an admirer ... I see Jessica as a CDer), there are others who are in it just for the sex and they will use every fantasy, every line imaginable to get it, if they do run into someone whom they believe is naive.
On the other hand, if both the CDer and the admirer own up to just wanting sex, if they both have active imaginations able to fantasize they are a cis-couple and they own up to this as well, then there's no harm, is there. :p