I was waiting on his front porch when Frank got back from the grocery store. I had just finished an 11 mile run and I was hot and drenched in sweat.
"Get naked," Frank said as we entered his house. "I'll toss your stuff in the washer while you take a shower."
"Okay," I said. "But don't wash the panties. I've been wearing them for you and haven't washed them in over a week."
Frank dried me off when I got out of the shower. He was naked except for my panties. His cock was barely contained by the thin nylon material.
"Now it's my turn," I said. "Take me to your bed and tie me down."
Frank had me lie on his bed face down putting a couple pillows under my hips so my ass was sticking up at an inviting angle. The padded cuffs held my wrists and ankles, spread eagle.
He got on the bed behind me freeing his dick from my dirty panties. Tucking the panties behind his balls he put a little spit on the end of his dick for lubrication and in one smooth motion pushed his hard cock into my pussy.
Just as he sank the entire length up my cunt the doorbell rang.
Pulling his cock out he said, "That's the doorbell. I'll just be a minute."
I yelled at him, "Forget the fucking doorbell and finish fucking me!"
He left me alone in his bedroom and I couldn't even reach my pussy to finish myself off.
Frank had someone with him when he came back into the bedroom.
"Hi, I'm Janice, Frankie's little sister. So, you're the girl whose been making my big brother wear your nasty panties?"
"I don't think I've 'made' him wear anything," I said. "He likes wearing my panties."
"Don't get your panties in a wad," she said. "I know Frankie likes wearing panties. He used to wear Mom's before he started wearing mine.
"We had a kind of symbiotic relationship with my panties," she said. "I'd wear them for a couple days then give them to him. He'd wear them for a day or two and cum in them before he gave them back. Sometimes I'd toss them in the wash but usually I'd wear them again.
Janice looked at me and said, "You seem to be in a rather compromising position."
"Well, there's not much I can do about it at the moment," I said. "But feel free to eat my pussy. Or better yet, give me a rim job."