She was laughing. And he does it in front of people. Or does he just get off on the power?
ДЛЯ ПОДТВЕРЖДЕНИЯ, ЧТО ВЫ СТАРШЕ 18-ТИ, ПОЖАЛУЙСТА, АВТОРИЗИРУЙТЕСЬ ЧЕРЕЗ ВК
He likes it. Possibly for the power but maybe he just finds you adorable? From an adult, it strikes me as low-grade sexual. The sad thing about label queens is that their world revolves around straight and gay.
Psychologically, the straight man tickling his gay friend has several possible conscious or subconscious motivations. Control or authority over another man. He is aroused by the pheromones produced by the physical activity.