There is an OK video from Paradise Vision called Magical Tootsie Tickle, in which a beautiful brunette is tickled in a magic box. The rest of the video is so so, but I've watched her little scene over and over. It is in the middle of the video and wow does she suffer. He tickles her in stockings, then cuts one stocking off and tickles her bare (and awesome) foot. But she protests so much that they cut the scene short.
Another good one from PV is called Naughty nurse. The first part of the video is good, the middle is OK, but the end is great. They have two girlfriends, a tall blond and a shorter brunette. The blond is tied down first and she just can't stand the tickling her little friend gives her. But the best part is the revenge tickling. She really gives much more than she received earlier in the vid. Very sadistic.
And finally, I must name a video that I consider to be kind of sadistic at the end. I know that some will disagree with me, but the vid is my favorite video of all time, Farra's First Time. The friendly, often funny talking at the beginning is good, and Farra is very ticklish all over her body. But at the end, Jeff really gives it to her on her armpits. It is so awesome that she says her safety word twice! (Lollypop) 😀 Then the cops bust in. I love it.