Okay, so this isn't necessarily a "fetish", per se, but I will admit to an extreme attraction to Kei Nagase. (Note the specific link.)
It isn't strictly a sexual attraction, though: it's not as if I simply want to see her wearing a bikini. I actually have an emotional attachment to her. It's strange, though, because I do feel some degree of sexual attraction to her. And to make matters worse, there are times during the game when Kei sounds absolutely seductive. To top it all off, I think she's damn cute.
As if all that wasn't enough, one of the best moments to hear what I'm talking about when I say that Nagase can sound "seductive" has this song playing in the background as she speaks.
And speaking of that song, I think it would be perfectly suited to a tender, heartwarming romance scene.
Also, for the record, Ace Combat 5: The Unsung War was my first Ace Combat, and my favorite.
EDIT: Typo.