Showering after dinner.

You wonder when your mother had time to bake you and your twin a cake as she brings it to the table. She even put 36 individual candles on the top of it somehow and it basically looks like a roaring fire is now in the middle of the kitchen. The traditional song is sung and you and your sister manage to blow out all of the candles without passing out.

It's sickeningly sweet, but still enjoyable if washed down with a glass of milk. You notice you've drunk a lot of milk today, almost feeling like you couldn't get enough of it. It's a thought that gets pushed out of your mind as the plates get cleared. Being its your birthday today you don't have to do the dishes again so you can go take a shower instead.

At that your twin starts to run through the house and you realise she's planning to beat you to it and in all likelihood would probably use up all the hot water. There has been a problem with the plumbing for the past two weeks which meant the hot water would get used up fast and not be replenished for almost two hours after each hot shower.

You grab Jenny's wrist before she can slam the bathroom door on you and you yank yourself inside.

"I'm first," you say, holding her back as she tries to reach for the shower curtain. "I'm the oldest."

"Yeah by like a minute," she snaps, rolling her eyes and straining against your firm grip.

"Two minutes," you correct her. She suddenly kicks her foot out and pushes against the tub and slams your back into the bathroom door. Your arms wrap around her chest and you hold on tightly so she can't get away as you both slide onto the floor. As kids and teenagers you wrestled with your sister often, but while you do it today you're well aware of yourself getting harder and harder as she rubs against you. You're both quite strong having been raised on a farm but you know that you can always overpower her, so it's a bit of a surprise when she twists out of your grip and rolls onto you, straddling your hips as she pins your shoulders down.

You're both breathing heavily and you see her staring down at you, her long hair brushing your cheeks. If she was positioned a little lower she would be right on your erection.

"Well I'm not going to wait for the hot water," she states, eyes still locked onto yours. You feel the heat of her body contrast with the cool bathroom tiles on your bare back.

"Neither am I," you say firmly.

"So, what? We'll do what we did as kids?" She eases her pressure on your shoulders and sits up a bit.

"What do you mean?" you ask curiously, brain a little blood deprived. When it clicks your eyes widen. "Take a bath together?"

Rolling her eyes again Jenny stands then takes your arm, helping you to your feet.

"Shower together," she says. "Not a bath. We're not five." She seems oddly serious now... mature even, as she pulls back the shower curtain. "We'll save water too right?" You swallow as you watch her turn the taps, as if the decision has already been made.

"I... guess..." You trail off, distracted by your sister taking off her tank top in the most casual manner, the sound of running water now filling the room.

"Dude you already saw everything this morning," she says as she starts to wriggle out of her shorts, boobs jiggling from her motions. "And I saw that too."

You look down at the tent in your pants that she's pointing at. You'd blush if you weren't already so heated. Not waiting for you she gets into the shower, sighing as the water runs over her body. You shrug and drop the only article of clothing you had put on after leaving the Big Barn this morning then join your sister under the showerhead. It's surprisingly roomy and you close your eyes feeling the day's accumulated dirt starting to wash off of you from just the running water. "Have you been hard all day?" your sister asks as she squirts some shampoo into her hand. You look down, take hold of your erect cock and start absently stroking it in thought.

"Well whenever I think of what we did this morning... yeah. And it popped up a lot during the day," you admit. Your twin nods with understanding as she starts to rub her hair. It's quite a sight that, along with the warm water, starts to ease all of your aches. You move out of the way of Jenny's elbows so she can get under the spray and you take the shampoo bottle with your free hand. She groans as the water runs through her hair and arches her back, sticking her breasts toward you until her visibly stiff nipples are just inches away from your chest.

"Watching dad fuck those cows was super hot," she says, grabbing her boobs with soapy hands, massaging and cleaning them methodically.

"And Betty fingering the chickens," you add just before you dip your foamy head forward for a rinse, closing your eyes. "That was crazy sexy." You hear Jenny moan in agreement as the images replay themselves in your minds and the water runs down your face. After a moment you feel wet lips on your mouth and try to open your eyes but can only squint since you're under the shower. There's no mystery to who it is of course so you just close your eyes and kiss your sister back, letting her tongue explore your mouth and tasting her diluted saliva with the warm water of the shower. She rests her forehead onto yours as she breaks the kiss and you hear her heavy breath.

She's masturbating furiously and so are you, your idle stroking now more purposeful. Your sister's sexy utterances start to grow sharper as she works her fingers faster between her legs. Her lips find yours again and you slide your tongue into her mouth. She sucks on your mouth muscle then moans, leaning her forehead into yours so hard it starts getting uncomfortable. She makes a strangled noise that catches in her throat and you feel her shake against you, her orgasm rolling through her. This triggers your climax and you start shooting jets of hot cum towards your sister. You probably coat her but it gets quickly washed down the drain. You feel like you cum buckets, spurt after spurt still spilling out with your hard and fast strokes. You fire what feels like a very powerful final rope as your sister kisses you one last time, mashing her mouth against yours hungrily.

After you break there's about twenty seconds of breathy recovery time taken by the both of you just standing under the shower. Then the moment kind of quietly passes and you both finishing cleaning yourselves. When your sister steps out of the shower you feel the heat starting to leave the stream and turn the water off then follow her out.

"So tired," you sister says conversationally as she dries herself. You nod and watch her bending over, your wilting cock twitching.

After you towel yourself off you pick up your shorts. You realise neither of you have brought a change of clean clothes into the bathroom but don't feel particularly shy about your nakedness anymore and open the bathroom door. You stop when you see Betty there, leaning against the wall with her phone in hand and a towel under her arm.

"Did you use all the hot water?" she asks, looking up from her screen. She doesn't seem surprised by your nudity but her eyes widen when she sees Jenny step out of the bathroom behind you, also nude. Her expression softens with a smile which is a relief to both of her younger siblings. "I'll take that as a yes." Without another word she walks away and goes to her room, presumably to wait for the hot water. You trade a glance with Jenny and she just shrugs and you both retreat to your own separate bedrooms for the night. You've earned some sleep.