Lynn is tickling Nina. She starts with a little sole massage. Nina is not sure, whether she should like this treatment, as it tickles. That's making Lynn hungry for more. As she is already sitting on Nina's back, she turns around and starts tickling Nina's waist, hip, ribs and armpits. Nina behaves like a rodeo, as she can't bear that tickling. For your information, Nina isn't laughing, when her feet got tickled (first 1:30 min), only the hard treatment (hip, ribs, armpits) demonstrates her real ticklishness.