Two incidents with a long-ago steady girlfriend . . .
We were both in college, and we were hanging out at my parents' house (they were gone for the weekend). I had been tickling her quite a bit that evening, and she finally got angry. She started tickling my ribs ferociously . . . so much so that I got up and ran! She chased me into my folks' bedroom, tackled me onto their bed (this was a very athletic girl), jumped on my back and tickled my ribs and sides so vigorously that I reached that pleasurable moment. She realized it, and happily, was turned on by it. It became quite an eventful night.
Some months later, we were on her bed watching a favorite TV series of hers. She was so engrossed in it that she didn't even realize I had coaxed her socks off. Her tanned size 8 feet were very ticklish, but I kept it light, so all she did was twitch. The twitching, though, excited me so much that -- again -- pleasure. This time, when she realized what had happened, she was upset and sent me home. Most of the time, though, she tolerated tickling . . . and even offered it if she thought she could get what she wanted.