This happened a few years ago. For my grandmas 80th birthday our family organised a party at a hotel and my whole family was there. I was 13 at the time and my cousin 18, she is really hot, blonde and she's slender and attractive :) so yeah, I end up staying in a room with my cousin.
On the first night, she said she was going down to the bar. She was wearing a short black dress, black tights and high heels. So she's out for a couple hours, I'm just watching TV. When she comes back, she is quite drunk. She lies on the bed and almost instantly falls asleep. We all had to wear formal clothes and I remembered I had brought 3 ties with me! Two black ties, one was a spare, and a blue party tie. She's asleep, so I figure why not have a little fun :D
so what I do is tie her ankles together, tie her feet to the railings at the end of the bed, and tie her arms behind her back. At first i was going to tickle her straight away, but then i thought itd be more fun to wait until she wakes up! She eventually does, and wonders what's going on. I have an evil smile on and ask 'are you ticklish?' she started panicking slightly, and told me she wasn't. I said 'so you won't mind if I tickle you'. She was getting nervous and begging me not to. I hadn't taken off her shoes yet, so I slowly slip off her high heels one at a time to build up tension :D she starts begging me now, but I slowly start poking her feet with my fingertips. She was giggling. Then I start using all 10 fingers :D I like her because she isn't so ticklish that she screams, but ticklish enough so that she laughs more than a monotonous giggle. She was trying to pull her feet away and everything, but nothing could shield her soles. I went over her sole, down to her heel, and up under her toes, all made her laugh. I found it hilarious and was having a great time, but then something strange happened
i was starting to get aroused, and my dick was getting hard. This was when I first discovered my fetish for feet, and tickling. I give her a rest break. During this she is begging me to stop. She said, to quote her 'this is real torture for me'. That statement aroused me more and made me want to continue. I start tickling her feet again. The silky feel of her black tights was now more arousing to me. My face got closer to her feet, and the sweaty, cheesy smell wasn't repulsive but more attractive. After about 20 mins I got tired. She thought I was going to let her go, but then I got my hair comb and brushed it up and down her soles. This drove her wild :D
after another 10 mins if tickle torture and sniffing I let her go. She wasn't very happy with me, but she said this would be between us.