Well, coming from a woman - if you or your friend is worried about being the object of someone's fantasy life, maybe you should both reflect on the fact that getting a picture taken steals your soul?
;o)
I guess there is a culture or a subculture where someone would ask before using a person as a focus for their sexual fantasies, but I can't imagine that it would be this one.
Relax... Take it for the compliment it was meant to be. Nothing happened. It was only a reflection of admiration. Accept the presence of charisma. What do movie stars&performers do in this situation? They accept it and make significant moves to preserve their privacy so their fan's fantasies can remain just that. Fantasies are just fantasies. If someone is going to use you in that way, just make it known that they've already chosen to distance themselves from the once-possible real thing with you. No Big Deal. Boundaries are OK to put into place - you don't have to get mad to enforce them.
If this is upsetting, reflect that it's awfully Catholic to pre-punish someone for thinking about committing a sin. Supposedly this sort of thing is not a sin unless the object of your fantasy is married. (My apologies if you are Catholic, but I don't think much of guilt as a control technique concerning ethics.)
You're probably already over it, right?
