My back; I'm still surprised by how sensitive it is because it's something so... non-sexual, right ? But a few gently grazing fingertips down my spine and j-j-jinkies ! <3
On a less gentle note, some blunt force to my lower stomach can have me ready to climax in moments, so I guess my uterus is sensitive maybe ?
For me it's my back and sides, when the oh strokes down my sides it's kind of tickly but I love it and she knows just how to do it and the right spots to really get me hot and bothered
My feelings... ha on a serious note I would say the most sensitive part is inner thighs, makes me shake like crazy when my partner runs her hands up them. Also my neck drives me a bit wild when it's kissed and licked
I have always been ticklish (screamer), however the most surprising place I have found was on one occasion I was driving and the man I was with licked inside my ear and wow what a reaction I had. Glad it was a quiet road at night but massive surprise