Doing something with Jan

You notice that Jan seems distracted, maybe even dissatisfied. When you ask her what's up, she hesitates before answering.

"Nothing. I'm fine. Everything's normal."

"Are you sure? You seem a bit out of it."

"I said I'm fine," she snaps, her eyes narrowing.

"Okay, okay, chill. Jeez."

After a long pause, she finally relents. "I'm sorry. It's just... we've been doing this every day for, what, like two weeks? I feel like something's missing."

Well, this sounds promising.

"I'll get some fireworks, then," you say with a knowing nod.

"Be serious, dude," she says.

"Okay, sorry," you say. "But what exactly do you think is missing?"

Jan chews her lip and stares at the ceiling. "I'm not sure. It's just a feeling, like we're missing an important element or something. Like maybe it would be better if... never mind. Forget it. I'm being dumb."

You shrug and carry on as if that's the end of it. But reading the mood between the lines, you're pretty sure Jan shut down the discussion because she'd made up her mind. As usual. It's just a matter of waiting to see what she's decided. Maybe she's ready to drop the act and admit what the 'arrangement' is really about. That could be fun. Or she might have inventent new mental gymnastics to dodge the I-word. That would be... interesting. In a Jan way.

By the late evening, you're feeling like you need your dick sucked again. You briefly consider sneaking in to April's room (formerly your room) to see if she's up for a little one-on-one on the sly, but think better of it. For now, you'll just go to your older sister as usual.

You find Jan in her room, belly-down on her bed and watching some Korean drama. She's wearing nothing but a night shirt and panties, and you take a moment to enjoy the view.

"Hey," you say.

"Hey," she replies, not taking her eyes off the screen. "Feeling needy?"

You grin. "Something like that."

She points to her nightstand. "Get one out of the drawer," she says enigmatically.

Puzzled, you open the drawer and look inside. There's a jar of cough drops, nail clippers, a box of condoms, a phone charger... wait. You take one foil packet and turn it over, examining closely. Yup, it's a condom.

"Put it on," Jan mumbles into her pillow, still not looking at you.

You wonder yet again what she's planning. Does she intend to jerk you off, using the rubber as a convenient way to contain and dispose of the spend? That seems like a big step backwards. Even so, you obediently tear open the packet and roll the condom onto your erection, the only part of you that apparently has no doubts.

"It's on," you dutifully report. "Now what?"

"I... don't want to miss this show," Jan says in an oddly shaky voice, blushing to her ears. "So... so you'll have to do the... do the work yourself this time."

She reaches back and pulls her panties aside. You stare in disbelief. The place between her legs is hidden in shadow, but Jan's meaning is unmistakable. At least, you deeply and honestly hope you aren't misreading things.

"You sure about this?" you ask, your voice thick with excitement.

"Shut up and stick it in," she replies, her voice trembling slightly.

You move forward and get onto the bed with her, straddling her from behind. She flinches as the head of your cock pokes her in the thigh. Then you reach down and grab your dick, maneuvering it into place. The tip slips between her labia, and she lets out a soft sigh. You pause there. Through the latex barrier, you feel a slight warmth. You drag it up and down, digging into her furrow.. Then you push forward, sinking slowly into your sister's cunt.

She moans and pushes back against you, urging you deeper. You bury your cock to the hilt, your balls brushing against her clit. She gasps and her back arches. You pause, then begin to slowly fuck her, your hips moving in a steady rhythm. She moves with you, pushing back each time you thrust.

"How is that?" you whisper.

"Don't talk," she says. "Just fuck me."

"Ah, is that what we're doing?" you tease, unable to resist rubbing it in even as your dick is rubbing it in. "I thought this was some kind of chore."

"It's... it's a chore, yeah," Jan pants. "It's a chore to... to keep you from... oh gods... from staining the... the towels. Just a... a chore..."

"And for that, I have to fuck my sister," you murmur into her ear, still driving into her. "And she has to take it... and love every second of it..."

You can't see her face, but you can feel her pussy tightening around your cock. Her hips buck and her body trembles. You need more. Taking a firm hold of you big sister's hips, you start moving faster, your strokes becoming longer and deeper. She moans and writhes beneath you, and her inner walls clench around your shaft. The bed beneath you creaks and groans in a steady rhythm, loud enough that you might worry about waking the neighbors if you were in your right mind.

"Oh shit," Jan gasps. "Don't stop... don't you dare stop!"

You have no intention of stopping. You reach down and find her clit, rubbing the sensitive nub with your thumb. She cries out and her body goes rigid. Her cunt clamps down on your cock and a wave of fluid washes over your balls. You feel your own climax building, your balls tightening and your cock throbbing. With a final, deep thrust, you bury yourself inside your sister and unload into the condom, forgetting how to everything as you just keep flooding the rubber with your spunk.

You're both still for a moment, then you release the breath you didn't realize you were holding and sit back on your heels, pulling out. The condom is filled with an impressive amount of goo. Jan is breathing hard, her body limp and relaxed. You dispose of the condom in the wastebasket next to the bed, and lie down beside her.

Jan rolls over and snuggles up against you. "That was... nice," she says.

"Yeah, it was," you agree. "How are you feeling?"

She doesn't answer immediately. Instead, she props herself up on an elbow and looks down at you.

"I feel... I'm not sure," she finally says. "That was... different. Better, I think. I was expecting it to be more... clinical. But that was..."

"Well, we were fucking just now," you say. "I don't think it can be spun as anything but that."

"I... I know," she says. "So now what?"

"If you're game, we can keep doing this," you say. "A lot."

She laughs. "Is that part of the arrangement?"

"From now on, it is."

She leans down and gives you a quick peck on the lips, then pulls back as if she's surprised by her own actions.

"So you aren't going to flip out or anything?" you ask. "You're not going to claim that was just a necessary, but purely clinical procedure to keep me from staining the furniture?"

Jan's face flushes. "I... okay, I admit it was a flimsy excuse. But I was scared. It's one thing to give you a blowjob or let you eat me out, but this... this is seriously crossing a line."

You glance around, purely to demonstrate that there's nobody around to judge the two of you, but catch sight of April grinning at you from the bedroom doorway. Her jeans are in a puddle around her ankles and her hand is down her panties.

"You're crossing it with an audience, now," you point out.

Jan looks at the door and sees April. She sighs, but she doesn't cover up.

"Okay," she says, turning back to you. "So I guess we're all in agreement that this is what it is and we're probably all going to Hell."

"Personally, I don't think Hell is real," April volunteers.

"That explains a lot," Jan mumbles.

"So," says April, stepping out of her jeans and walking toward the bed. "Are we officially a thing now? Like, a three-way?"

"We're not a 'thing'," says Jan. "We're just... a mess."

"I can live with that," April says, climbing into bed and cuddling up on the other side of you.