Is it weird for a girl to fantasize about her girlfriend role-playing as a boy?

i am a and i have this fantasy about having my girlfrend dress up like a boy and then tease me, kiss me, have with me, do whatever with me. i normally don't like "dikes" or "butch" girls, they just aren't my type, but i found it extremely hot when my g.f. put on her brothers hat and sweatshirt (just playing around). now i cant stop thinking about how hot i think it would be if we did role-play with her as a boy... is this weird? what do you think about this fantasy?