It's definaelty watch my girl friend tickle another girl. When i was 20 and dating this one girl, my GF knew of my fetish. And so her girl-friend was like hype ticklish and anyone that knew her knew that about her. So when my GF wanted to make me crazy and totally turned on, she would tickle her GF infront of me and give me this devilish smile. Oh my god! I remember it like it was yesterday.