I have a step sister who is 6 years younger than me. Growing up I tried to protect her but she hit that bratty mid-teen phase where she became a total douche.

One summer our parents found a very expensive bottle of wine in the trash. Knowing it wasn't me, therefore it had to be her, still underage, I took the fall, paid them the value of the wine & took my revenge on my smirking step sister.

Later that day she arrived in my room to thank me for taking the punishment I made sure she didn't do it again.

I told her I'd rat her out if she didn't do exactly what I told her.

1. If I said her name she had to strip to her bra & panties.
2. If I said her middle name she had to strip naked
3. If I said her last name she had to flash her ass & top
4. If I asked her to do something, no matter what, when or where, for the next month she had to do it

Number five was my favourite. A bit of hot & cold. We went down to the kitchen where I had hidden a set of her underwear. A very wet bra (now frozen) in the freezer & a matching thong in which I'd put hot chilli powder & curry powder.

For the rest of the night I gleefully watched her squirm & shiver. When it was time for bed, I twisted her cold hard nipples & pulled her thong as far up any "crease" it was in.