repelled? mein gott...then....then you'd fly off the planet!
It's just fantasy, especially if it's an RP scenario. If they can act as if they were ticklish then it's ok. Of course it depends on what you want and/or have paid to see. The best would be to combine ticklishness with desirable reactions but someone who is not very ticklish but knows how to act can also be appealing (for example while being tickled by a feather laughs convincing and wiggles her toes and soles in a nice sexy way).It's surprising how good some non-ticklish women are at pretending though. There's been times when I've recognised girls from tickling clips in foot worship videos where she's shown no reaction to something that was apparently excrutiating for her in the tickle clip.