Assuming "racky" is of the good variety 😉 -
The night after I revealed to my girlfriend about my love for tickling. She took it very well, and then bought handcuffs, feathers, everything for me! Restrained, I was still hesitant (I care very much about her) but she simply said "for once, do what you want".
I went crazy. It passed in a haze of ecstacy and indulgement, tickling her everywhere, running my tongue in her belly button, her armpits nibbling her sides, her breasts, and always returning to the soles of her feet. She gave up quickly, but got better...
We'd have more prolonged, experimental tickling sessions later, but my thoughts always drift back to that encounter. It was...well, it was Heaven. :/