It was many years ago. I was 25 which made my sister 20 and her husband 21. For what it's worth I'm 57 now. It had all started with a phone call one night. We had all tossed a few back. I was in Texas on active duty, and they were in Massachusetts. I was trying to get them to admit to having threesomes with his ex who was there also. To hide the fact of the threesome, they had told my parents that she was his sister.
I had commented that I'd like to fuck my sister, and they laughed, and she said that she didn't think she could do that. I laughed and told Mike he could fuck met up the ass if he could convince my sister to let me fuck her.
Months went by, and the topic didn't come up again. As we lived 1000 mile apart, I didn't think it was going to be more than just a drunken fantasy. Although I had been fantasizing about doing my sister since she started to grow tits, I had never expected anything to happen really.
It was late November almost a year later when I was in town for my fathers birthday. It was a typical cold dark New England weekend, we had a party for my dad, and I was just hanging out after. Going to church was planned for Sunday morning but figured it was going to be a dreary Saturday afternoon and evening.
Well, that changed with another phone call. My dad called out that Mike was on the phone. Wasn't thinking anything about it when he suggested I come over for dinner in an hour. Since we didn't have anything planned I figured why not. Now over the years we hadn't talked much. My sister and I only recognize that the other exists. But Mike is a SciFi nerd like me so I figured we'd chat about Star Trek or Star Wars or something like that. After I had agreed, his next words made me raise my L eyebrow. He told me to come in and come upstairs but NOT to say anything. He reinforced the being quiet and not saying anything a couple of times.
2 pm came quickly, and I headed out. It was snowing lightly, and I remembered why I didn't miss living in New England. I got there early and pulled into the driveway, slipping and sliding a little as I pulled in. I saw a curtain pull back in an upstairs window, but I waited till exactly 2:20 pm to walk to the back door. The door was open and I walked in. I took my jacket off and my boots and walked through the living room to the stairs and tiptoed up them slowly. The master bedroom was just at the top of the stairs and what I saw made me take a deep breath in, which got me a scowl from Mike. There on the bed was my sister. She was naked, and her hands were handcuffed to the headboard, and she was well blindfolded. She was going to see nothing through that. The foot of the bed was toward the door, and I saw that she had been well fucked before my arrival. Her lips were red and swollen, and I could see cum right in the opening of her pussy. I looked up at Mike and he smiled at me.
He put a finger to his lips and spoke to Dianne. "Here he is, the phantom play partner. You will never know who it is and over time you look at one of my friends, you'll wonder if it was him" He then explained further. "For him to enjoy the pleasure of tasting and feeling you, he had to agree to let me fuck him up the ass. It's a shame you won't be able to see that happen."