This is one of my favorite things too. The more the girl loves being tickled, the hotter it is for me. While there are tons of clips where the lee seem to be enjoying herself, it is quite rare to find ones where she genuinely says something like that or asks for more. Here are some that I love, but they're pretty old so not sure how easy to find:
French Tickling - anything with Sydney, such as "Asian Babe Sydney Tickled and Excited." She absolutely loves being tickled and gets extremely turned on, frequently yelling yes or more in French
Let's Tickle Christine - one example is "Armpits Tickled and Licked," but literally any of her clips. Christine is a true ticklephile and loves it. The better the guy gets her the more she yells "Yeah!" in between gales of laughter
Nylon Tickling - "Tie Me Up and Tickle Me." I don't even know the girl's name, but she's an ideal lee. Asks to be tickled and says she loves it
Paradise Vision - "Sheik's Delight." 3 girls want to be tickled to become the sheik's new bride. The first, Bella, really sells it, constantly saying she loves it and telling him where to tickle
Stryker Entertainment - "Intern Tickles the Boss." The boss obviously loves being tickled and openly admits this partway through, while also clearly getting turned on
Tickle Abuse - "My friend's girlfriend." Absolutely loves the brush, and openly admits that after a lot of "oh my god" and "wow" in between squeaks and laughter. Clearly turns her on as well as tickles
Tickle Intensive - "Ticklish Sister." Krystal loves it, the harder the better. When the ler uses brushes, her laughter doubles and she urges "go harder!" At the end she admits loving having her feet tickled
UK Tickling - anything with Holly McGuire, such as "Holly and Ruby's Double Nylon Foot Tickle." While I don't remember her openly admitting she loves it, Holly clearly does, teasing, squeaking, and sometimes even saying "yay!" When the ler tickles Ruby, Holly mocks her trying to get him to go back to tickling herself
