Actually, one of the best reactions I ever got from a ticklee was not tickling her at all.
🙂
After tickling her for a bit, she just couldn't keep her hands away from her sides, I'd tickle around her arms, but could never quite pin her down on the bed, she was a giggle mess, and I told her I'll leave her alone in one condition.
All she had to do, was keep her hands behind her head for 20 seconds with her arms relaxed, and I promised I wouldn't tickle her. She didn't want to believe me so I kept tickling her anyways. ^.~ She finally gave in, "20 seconds... you promised eh?"
I promised, I would not tickle her for 20 seconds.
She kept her hands behind her head, but as my fingers neared her underarms and sides she just started laughing and squirming more than she did when I actually tickled her, I counted down from twenty, slowly, all the way to one. I kept wiggling and teasing just shy from her skin but I never touched her. I laughed and looked down at her as she kept laughing and trying to buck me off her (I had straddles her at the waist

). Good lord, I never thought she'd react that way.
🙂
Finally when I stopped counting I pulled my hands away. "See that wasn't too bad..."
She sighed with relief, she made it... lol, but I never told her I wouldn't tickle her after the 20 seconds were done. ^o^ Sometimes the best tickling, is in the mind.