That's a good goal actually (more specific than mine lol)I do, to tickle a good friend of mine until he passes out due to pure glee lol. Only problem is he probably won't let me even get him for like five minutes lol, but I'm working on it 🙂
I have a female friend for whom I have had feelings for. Those feelings have since subsided (since we both got involved in serious relationships, not with each other though), but I still harbour a desire to pin her down and tickle her feet for a whole day. I have tickled her feet but never for more than a few minutes. We still get along well and occasionally meet, and it is something I will secretly work on 😉