"I've got a request." My sister-in-law and I were sunbathing naked in my garden. We'd had a couple of drinks and were nicely relaxed.
"Uh huh."
"Most people would think it pervy and disgusting, and although I know you are perverted and disgusting it may even cross your strange code."
"Try me." My hand went to my pussy in anticipation.
"Well, you know you said that you didn't like big things up your bum."
"Yeah."
"And your husband has, well, a big thing."
"Yeah." I genuinely didn't spot where she was going.
"And I do like big things up my bum ..."
Ah. Got there now.
"You want Mark to fuck your arse?"
"Well, yes, if you wouldn't mind, but that's not all of it."
Dear God, what else?
"Well, I wondered if we got a dildo that was exactly the same size as Mark ..."
"Already have one."
"Great. Anyway, if Mark fucked my arse at exactly the same time as you fucked Nat's with an identical sized cock. Sorry if it's too weird - I've just been playing with the idea."
"And playing with yourself with it, I notice." She was squirming nicely on her hand while telling me.
"Mmm. What do you think? I mean, doesn't Mark miss having an ass to fuck?"
"Yeah, probably. I don't encourage him to fuck other women's bottoms."
"Oh, Sure. Sorry."
"But it does sound sexy. Can I think about it?"
"Of course."
"Would you like to try the Mark sized dildo anyway?"
"You want to fuck my ass, you mean?"
"Well you did do mine,"
"Well, Nat doesn't encourage me to let women fuck my bottom. But it does sound sexy. Can I think about it?"
"Touche." We dozed in the sun, each thinking dirty thoughts.
Later she said, "How big is his cock? I mean I saw it in that video, but I couldn't really tell."
"I've seen bigger in porn, but never in real life. I've seen quite a lot, but obviously not enough, because statistically one person in a hundred is actually bigger than him. Look, I really have got a dildo exactly his size, I'll show you." I went into the house and fetched it, on the way back noticing how sexy she looked, lying there naked and rubbing her cunt. I decided.
"Annie, can I put this on now and fuck you up the bum?"
"Does that mean Mark will be doing the same thing some time later?"
"Yep."
I'm not going to give you a blow by blow of what happened next, I'm afraid. It was good, and boy did she like having that large thing up her - came like her life depended on it. I'm sorry you're going to miss out on that as I'm going to fast-forward to the following Saturday. But first I need to tell you of a little conversation we had after I fucked her.
I was having slight concerns over Nat's feelings - after all, she wanted Mark's cock specifically because it was bigger than his. Nat's cock is perfectly nice, but I worried he might get a complex about it. Annie claimed not.
"Look, Nat's got a nice but normal cock, and I have a bit of thing for big ones. I've got slightly small tits, and Nat's excited by much larger ones. I don't take his predilection as a judgment on me, so I don't see why he would judge mine."
For some reason I suddenly remembered Annie's sister, Chelsea, has massive tits, and said, "So if, for the sake of argument, he wanted to cum all over Chelsea's tits, you'd be fine with it?" There must surely have been some sibling envy at some point.
Her hand went down to cunt again as she considered. "Interesting thought. If you'd asked me a couple of weeks ago I'd have been horrified, but since you've been corrupting me I'm not so sure. Anyway, Chelsea's a complete prude - no chance there."
I'd only met Chelsea a couple of times, and to be honest her tits were the only thing I really knew about her. Suddenly the thought of my brother coming all over them was a big turn on. I kept thinking about it in the days coming up to our little foursome.
--
All I had told Mark was that Annie and Nat were coming over and he was going to enjoy it. Obviously I'd recorded me doing Annie, and he'd enjoyed watching that. I think he imagined a repeat performance, and was quite excited just by that idea.
"OK, we have an activity for the evening, and the rules are simple." Simple, but fixed for the result I want.
"Everybody will get their ass fucked, and everybody will fuck one ass. And unless there's a huge problem you get one veto on who fucks you. And I'm sorry Mark, but I'm vetoing you."
Nat looked surprised, and said, "Well I don't know if that's what Jools had in mind, but I'm vetoing you as well, Mark. Sorry mate."
Mark pretended to look crest-fallen, and turned his puppy-dog look on Annie. She smiled, and said, "OK big boy, I'll put up with you, I guess."
I looked at Nat, affecting surprise. "Well, brother, I guess that means that in round one I get you. Pucker up!"
"And in round two, do I get you?"
I looked at Mark, and he nodded approval - he wasn't going to miss a chance of Annie returning the favour on his back-side.
I led the way to the bedroom, pulling off my dress as we went. In no time at all I had the harness in place with the massive dildo jutting obscenely from it. Nat looked slightly concerned, but Annie reassured him that he'd be fine.
I said, "I want you on your back this time, brother. I want to play with that cock while I'm fucking you." And I want to talk to you. About Chelsea.
Mark and Annie were all over each other by now, and I must confess to a slight pang of jealousy: not only is she super hot, she was indulging him with something he loves and I can't deliver on. Ah well, can't have everything all the time.
I was taking it very slowly with this huge cock up Nat's arse. We used industrial quantities of lube and took it very slowly for a good long time. I was playing with his cock, and having an admittedly rather staccato conversation.
"So, " I said, "Strap-ons were Annie's fantasy. What's yours?"
"Haven't any," he said.
I gave a slightly harder thrust to concentrate his mind, and said, "Liar."
"OK, leather and latex." I changed my angle slightly, and he added "Ooh, that was good."
"Leather and latex are always good. But real people - what would you go for?"
"Annie is perfection. And you're pretty hot."
"And if Annie gave you a free pass on any woman, what sort would you go for?"
Now even though Annie was having a great time being sodomized by my husband's huge cock she was still paying attention.