As far as I am concerned, there is a broad range of responses to the sensation of being tickled.
The ones I prize most as a lee (I am a switch) are
exhiliration and
timelessness. Agreed, these do not easily materialize, especially the latter, but that's
what I want to feel like when I let someone tie me up and tickle me, especially for over 20/30 minutes. It works best with sensory deprivation (blindfolds required).
Timelessness might sound like a big word, but it quite apt to describe the hopelessness one feels when getting tickled past one's limits and out of one's senses.
A 30 minute tickling session can then seem like it had lasted for an hour or more.
Another equally pleasant reaction to tickling is arousal (which in my case depends more on the chemistry with the ler than on the actual spots being hit).
On the negative side,
irritation and actual
despair are rather obvious answers. I have never felt actual despair but glimpsed it after being tickled well past my limits,
with a ler showing me no sign of relenting. I was also gagged and no safeword had been agreed to top it all. A schoolboy's mistake ! It was very hard for me to expect that in ten minutes' time the exhiliration could turn into despair, with questions like "Am I going to suffocate ?" or "Is she going to stop anytime soon ?" starting to pervade my mind and adding to the anxiety.
When the tickling stopped, I felt like more like walking out of Guantanamo than having indulged in kinky sex.