She is in fact ticklish - just about everywhere. The fur at least offered some protection. But half-dressed and trying to hold her tail, it's pretty much impossible to avoid him.

"Stop, stop! Jacob!" She squirms trying to hold it together as he keeps playing his hands here and there. Pushing at him as best they can. Digging her elbows against him as she leans her head against his shoulders. "Of course I'm ticklish! Stop!"