I don't think that's a problem truth be told.

I mean, fandoms are the biggest open secret out there....
It's just because they keep to themselves, noone cares.

The most important thing to consider would be the person you gave it to - one story isn't going to 'reveal' a fandom, but could very well upset the person...

It's like, most celebrities know that fans have fantasies about them, they'd just rather not know what they are....