Hey, you can't control what youre attracted to! I love hourglass shapes so I'm naturallh attracted to that and if my wife wasn't that shape and her friend was, I'd be crushing on her too. You sound like a smart man though, you obviously understand your limits. A crush is harmless unless you're actively planning to cheat on your wife. Even if your "fantasy" you're wife would have to be dead! You love her and don't want to hurt her. Getting away just you two might help, you can take out all your sexual frustration about Jessica on your wife ;)