"I hope you're damn well pleased with yourself Zil!" Anne shouted, as she burst into her sister bedroom.
"How could you do it? And don't try and deny it, because I've seen you fuck too many men to know that look on your face. That bloody bouncy walk of yours, on your toes, with your nose in the air and grinning like a Cheshire cat. Look everyone, I've just been fucked!"
Zil was standing naked by the wardrobe, getting out a fresh bath towel. She tried to say something in her defense but her elder sister cut her off short.
"I mean... we had an arrangement, didn't we?" Anne insisted. "All those years ago, didn't we agree to keep our threesome sex to ourselves? It was going to be just you, and me, and Andrew. Didn't we agree to that, no one else ever involved in the family?"
Zil threw her arms up in the air waving the large bath towel, before managing to blurt out, "I never wanted it to happen Annie, I swear. He just came onto me!"
"Oh right ...out of the blue was it ... no encouragement from you I suppose?"
"Yes, right out of the blue! I asked him how's things were going at his University, and the next thing he has his cock out, telling me how he likes older women and me especially!"
"And when was all this?" Anne demanded to know, now lowering her voice somewhat.
"When you were out shopping this morning. Tom was sat reading on the sofa and I came into the sitting room and sat down next to him for a chat." Zil reached out and took hold of sister Anne's arms to steady her down.
"Believe me Annie, nothing was further from my mind. It was when I asked him jokingly how his love life was going, that he became all-serious and started telling me how he fancied me. I was dumbfounded. I told him to stop fooling around and put it away and stop being a silly boy."
"But he didn't did he?" Anne guessed. "I bet you couldn't take your eyes off it, could you?" Pausing and almost in a whisper she asked," Dose he take after his Father in that department?"
Zil pulled her sister close to her, and put her arms around her tightly, hugging her, and reluctantly admitting, "Yes ... I'm afraid he dose." Adding with a hidden grin, "He might even be bigger!"
Anne shuddered in Zil's arms and then with some anger, pointed out. "It's not as if he hadn't got plenty of girls his own age to play with. I've always encouraged him to bring his girl friends home for the weekend. I've never been a prudish mother when it came to sleeping arrangements here at home. I even put up with that nasty little slut Amanda. Remember her?"
"Wasn't she the one who never put any clothes on and screamed the place down all night long?"
"Yes ... that's her, but if you say Tom takes after his father then maybe the girl had something to scream about! Actually she has always reminded me a bit of you Zil, you never have any clothes on either!"
The two of them laughed and Zil quite deliberately started to undress her sister Anne, who willingly obliged and let her clothes fall to the floor.
When as naked as Zil the two women lay down in each other's arms on the bed. They were now as one. Warm and close and both felt so very safe from the world. Doing what they had been doing all their lives together, relying on each other for that loved feeling they never got from their parents, but only from each other. Being both now in their mid forties they looked good for their age, and both could pass very easily for a woman ten years younger.
Their father had been a diplomat and they had traveled the world from embassy to embassy. There had been endless governesses and lots of new languages and customs to learn about. It had been an interesting life for young children but one that never gave them much time to make any real close friends. And when older they were sent off back to England to a boarding school, where again they were left to their own company and that of an old Aunt that housed them during the school holidays. Life had made them reliant on each other so very much.
"Did you do it on the sofa then?" Anne wanted to know after a few minutes had passed.
"No I took him upstairs, but you came home before that monster cock of his was put to any good use in me. I did however get a good suck on it and we did just manage to get naked, but as I said you put a stop to us doing it right there and then."
"Tough luck!" Anne said with a laugh before sucking hard on Zil's nipples and sliding a finger deep up her sister's cunt, before retracting it and sniffing the air disdainfully.
"God, You smell like a rancid ferret!"
"Yes I know, and that's why I was going to take a shower."
"So who's idea was it to go for a walk? Anne asked wanting to know more. Zil slid off the bed to kneel on the floor and pulling her sister's legs towards her put them over her shoulders and went down and licked Anne's pussy the way she loved it licked.
"Mine I suppose." Zil said pausing. "As Tom was in such a desperate mood, I thought I'd better get him out of the house, so we went with the dogs down to the oak wood in the valley."