Wonderful question! The more the lee loves it, the better for me. But to help me recommend better, what sort of reactions do you prefer? A few kinds leap to mind, which seem different (to me at least):
1) pure fun - she's super ticklish and laughing in delight, so both lee and ler want more
2) ticklish turn-on - focus is tickling but amidst the laughter she's getting aroused too
3) ticklish O - she orgasms during tickling (with or w/o other stimulation)
4) ticklish pleasure - she loves being tickled so much she reacts more like sensual massage, not much laughing
The second kind directly seems to fit. Are any others of interest too?