It's funny you should mention eyes. That reminds me of a time with my first gf Kt that I mentioned once before.
It was myself, Kt, her friend Pri and her bf. I had previously told Pri that I tickled Kt when we went to see a film, I remember when the film started and the lights went off Kt was sat in the middle of myself and Pri. I had my arms around Kt and I just happened to notice that Pri was looking at KT curiously. she ever so slowly moved her hand that was flat on the seat towards Kt, like a predator sneaking up on its prey and the entire time she had this look in her eyes like a scientist testing a theory. This was interesting considering she knew Kt was ticklish and it was Pri that told me to tickle Kt in the first place.
Kt jumped as she usually did when tickled and Pri with the same expression on her face, did it again. As before slowly sliding her hand along the seat towards Kt's sides, but this time Pri kept her finger there for a few seconds causing Kt again to fidget around for a few seconds longer. If only I had known then I would of upped this game and taken off her shoes and socks and tickled her feet too, since I had found out how ticklish she was there, but I digress...
Pri did it once again causing her friend to jump, however this time I looked over at her and she looked right back at me. It was if she said with her eyes "let's get her!"
So Myself and Pri started ticking Kt at the same time, the sides, under the arms, knees, top of her thighs, KT squirmed all over the place and burst out laughing silently whispering "stoopp iiittt hahaha". We both stopped before she burst out laughing loudly; which she came very close to. I felt aroused again after this event and we even had quite a sexy make out session. I even had to tell Pri to stop tickling her because a few times KT would flinch when we were trying to make out lol.
Incidentally I do remember Pri's bare feet sticking out towards me at somepoint as well when she hugged her bf, but I never did try tickling her.