Think I already commented on here, but I thought of another one. One of my deepest, darkest because my wife would be mad at me for it, but I definitely want to see my wife and her sister-in-law get into a tickle fight or tickle the heck out of each other during a family event or when we're hanging out.
I shared a pedicure story on here a while ago where myself, my wife, and her sister in law all went for pedicures. The second her sister in laws feet started being scrubbed, her face screwed up something fierce. She didn't laugh, but I think if the tickling were more intense and she were unable to move her feet or pull away, she would crack. You could tell she was close but somehow managed to just keep her composure. My wife is a damn good tickler and her nails can be so torturous. I know sister in law wouldn't be able to take it. She's also a bigger girl and strong as she works out a lot, which is another thing of mine - seeing strong girls lose their composure from tickling.
I want to see the two of them get into it with some tickling, maybe my wife surprises her with a tickle attack on her feet and she loses it, but I ultimately want it to end with the tables turned on my wife and her tickled mad. Maybe I step in to help. Maybe I sit back and watch.
It'll never happen though because her family isn't really a touchy feely family and sister in law hates her feet. She literally always wears shoes and socks at damn near all family gatherings. My wife's mom started this no shoes policy at her house which got me excited, and the one time sister in law showed up wearing slip-on hoes without socks, but she hates her feet so my wife's mother allowed her to keep her shoes on while everyone else had to take them off.
Also, for any naysayers or critics out there, let me just elaborate. I only have feelings for my wife. I've just really wanted to see the full extent to which sister in law is ticklish ever since the pedicure incident. It barely tickled my wife and I, and we are both pretty ticklish during pedicures, so the fact that she almost completely lost it means she must be incredibly ticklish.