"It's Earth Day at last."
"Yeah, Outdoor fucking begins today."
"Even though in this part of the country, most folks have to wait til May, or even summer, it's great we have our hot tub, to get the early jump."
My wife Mallory was idly stroking my cock as we floated away a lazy afternoon in our back yard hot tub. With any luck, this would be a prelude to great sex, perhaps not just here, but perhaps later again in the shower. Or the hammock . Or the bedroom. Or the kitchen. Or all those places.
Mallory might be monogamous, but she never met a marital sexual adventure she didn't want to try. She had a hot body, still in great shape after several years of marriage, all the curves in the right places. Right now, with her auburn hair pulled back in a ponytail, and the spring sun freckling her fair skin, she could pass for a high school cheerleader seducing the quarterback. Which was how we had hooked up at eighteen. When Mallory spoke, though, it was not the straight up proposition I expected.
"You said you would tell me your hot tub fantasy for Earth Day. Well, it's that time, honey. It's not just this nice Earth Day weather that's making this root of yours grow."
Spring had indeed sprung in our back yard, and the hot tub was filled every day by several of my wife's beautiful bouncy sisters. When I had struggled writing a story for Literotica's Valentine's Contest, she had inspired me by teasing me with ideas of sex with those sisters. In the very hot tub we were now enjoying. I had foolishly promised to spin a fantasy about that for Earth Day. I would have agreed to anything, since at the time, Mallory was denying me a much needed orgasm. Now, she wanted to collect on her blackmail.
"Maybe you should invite your sisters over, and I'll show you. "
"Show, not tell, the writer's motto?"
"Mantra, Mal, but you got the idea."
"The idea that you want to fuck my sisters."
Her expression looked angry, but there was a teasing tone to her voice, and she finally broke into a grin, her hand still tightly gripping my cock, which was surging to fullness from the combined effect of her stroking and the taboo of fucking four sexy sisters.
"What man wouldn't?" I wanted to see where this might lead.
"I admit, Bridget doesn't help by continually teasing about doing a three-way. I bet you'd love her curves. Soft but firm. She might have had to give up competitive sports, but she still works out daily. No wonder you have nude hot tub fantasies about her." Mallory's Valentine adventure had included her older sister in a central role, but I knew Mallory still clung to her self-image as a straight one man woman. Not that I minded, especially since when it was my erect cock she was clinging too. She shifted in the hot tub, letting me see her ripe breasts, not quite as big as Bridget's, but still firm.
"Well, I can already see her curves just fine in her bikini. It doesn't exactly hide much"
"I mean more than see them. I mean live out your fantasy. Which you still haven't described to me."
Her breathing was becoming faster, as she tickled my balls with one hand, still stroking me with the other.
"Well, the version I told you at Valentine's included the twins."
"I wish I never told you they like to share. Although, with their beautiful long blonde hair, I can understand how any man might get excited by them. Personally, though, I prefer B's voluptuous body, or even my curves, to their skinniness. They have hardly any boobs at all."
"From what I recall though, it doesn't take much to make their nipples hard. Even some nippy spring air would do it."
"You are such a perv, scoping out your little sister-in-laws' nipples." I knew now that the fantasy or the idea of my being a perv at least, was exciting her as well. She stroked me rapidly, snaking a finger under my butt to stimulate my prostate.
"Hey, I told you. In my ultimate Earth Day fantasy, all four Good sisters are naked in this hot tub, celebrating nature the natural way."
Mallory blushed so deeply even the tops of her ripe breasts turned crimson. Despite the warm water, I noticed her nipples were stiff.
"I have a confession to make. Sometimes, when the twins don't have school, they come over in the afternoon and we sit here naked drinking wine. I always figured you wouldn't mind."
"Too bad I never snuck home early from work."
If she kept stroking my cock, her expert fingers teasing the head, I would come way too soon. I had to find a way to turn the action towards her.
"While I'm confessing, I might as well tell you- I always fantasized about that happening. It got me so horny, if you weren't coming home, I might even have licked Krista or Claire, just like I imagine you doing. Except of course, no one can lick just one. Do one; you'd have to do them both. Then your tongue might be too tired to treat me properly."
"Maybe one could eat you while I taste her twin?"
"Oh...is that in your fantasy?"
"I love the idea of Krista sitting on the edge of the tub, leaning back, balanced on her hands, tits thrust skyward as my tongue dances circles around her clit. I would tease it slowly a long while, because my concentration would be split, watching Claire sampling your honey pot."
Mallory, as if reading my mind, hoisted herself onto the hot tub deck, assuming the position I described for Krista, but staying near enough so that she never relinquished her grip on my cock. Her fingers were acting like a cock ring, restraining the load of sperm building in my balls.