When I was in my early twenties I lived in a shared house.
It was a big old house with half a dozen bedrooms. Used to be more but the owner had remodelled and put in an en suite for the main bedroom and a second bathroom so the other five bedrooms had two to share.
I worked and was currently on afternoon shift, meaning I didn't start work until three. I had got up late and was having breakfast when Suzy wandered into the kitchen, probably seeking her own breakfast. Suzy and her husband shared the main bedroom.
It was a week day and everyone but me and Suzy were off, either gainfully employed or at college. I didn't realise Suzy was still home until she walked into the kitchen in her undies. Very nice undies, I admit but I suspected that she had not intended to show them off. She looked quite surprised to see me. I was also somewhat surprised.
"Um, Suzy, you do know that there is a house rule that young women wandering around in their undies get their bottoms smacked. It's to stop them teasing the male boarders."
"You liar," she said. "There's no such rule."
"Truth," I insisted, "but don't worry. In your case your husband will deliver the smacking. You may even enjoy it."
"He wouldn't dare!"
So emphatically stated. I sighed.
"Are you sure?"
"Certain."
"In that case I guess it's up to me."
Before she had time to follow my logic I'd moved, grabbing her arm and pulling her across my knee. I didn't remove her panties (they weren't covering much anyway) but simply brought my hand down in a casual spank. It was more for shock value than anything else.
"How dare you?" She snapped, highly indignant.
I just laughed. "Something to remind you of the house rules," I said cheerfully.
So did she rush back to her bedroom to get dressed? Ha! She remained right where she was, making her breakfast, not caring how much she had on display. I wondered if she knew her panties were effectively transparent when they were damp, which they currently were.