Because we want YOU to look as good as they day we met you. We are attracted to your looks first! Even without opening your mouth, we see what we see and we are like "DAMN, LOOK AT HER!" We worry about how brain dead you are AFTER we get done looking.
Now as for tricham:
Dude you gotta focus on your mission. Is tickling her your primary mission? If so, you can lay down the law as being FRIENDS, and just chill with her, but always being playful, tickling her, making it fun for her. THEN you will be getting your tickles in anytime you want. Are you on a regular tickling schedule, meaning, you have other girls that you can tickle on a regular basis? If not, then that means you are starving to give a good tickling, and you have the perfect victim...one who likes to be around you, HAS HOT FEET, and you know you just dont wanna pass that up...do ya?
As for her looks, you can overide that cause you just want to get those feet in your hands (or mouth) and once SHE gets to that understable point that you like to tickle her, have fun with her, and SHE enjoys what you do, then your safe and wont hurt her feelings.
I have a female friend who is attractive to a point in my eyes, but a nut case in other ways and Ive had my fun with her and her feet many times over the years. Nothing sexual ever happened. Imagine having a friend who knows all about your tickling and foot fetish and allows you to enjoy it anyway you desire? That is what she was. Sadly I broke off the friendship because she acted way outta line at my job one day over a discussion. But the memories are still there and I miss those toes.
So take the time and do it right, and she will be an asset to your fetish.