Fission 1

Yes, the title is a reference to Oppenheimer. I had to.

Also, there's no sex here, or in the next chapters, just plain old drama. Skip them if you want.

The atmosphere of the house has a nervous quality to it. You and Lisa are in your bedroom, getting dressed. You have about an hour left until you have to leave for the airport to pick up your sisters. The house is prepared, the food is ready. Everything seems to be under control, as far as that's possible.

"Do I look okay? Do I look normal?" Lisa asks as she skeptically eyes herself in the bedroom mirror. Her outfit consists of a white blouse, a dark blue skirt, and black high heels.

"Yes. It's all good," you reply as pull up your boring pants over your boring boxer shorts, finishing your outfit with a boring t-shirt - trying to hide your sexy body as much as possible. "No one will suspect anything."

"But... my breasts..." she pouts as she stares at them in the mirror, lifting up her large boobs. She turns around to get a better view.

"Mom! Relax! You'll be fine!" You say, exasperated. "Let's go!"

Lisa sighs and lets her boobs fall back against her chest with a soft plop. She nods and looks up at you, giving you a brave smile.

"Alright. Showtime."

The drive to the airport is uneventful. You arrive fifteen minutes too early, which is the opposite of a problem. It gives you enough time to calm down and prepare yourself mentally for what lies ahead. You exit the car and walk towards the arrivals area, your mom following closely behind. There, you can see that your sisters' flight is marked as 'Approaching' on the giant screen above the entrance.

Lisa and you stand there, arm in arm, anxiously following the state change to 'Landing', 'Landed', and finally, 'Baggage Claim'. A few minutes later, the first passengers leave through the automatic doors and enter the arrivals area. After waiting another couple of minutes, you spot Crystal and Sarah coming through the doors together, hand in hand, with tanned faces from summer camp.

Your heart skips a beat when you see your sisters for the first time in two months. They wear comfy travel clothes and are rolling their suitcases along beside them. You start feeling nervous and excited at the same time, overwhelmed by your emotions.

Crystal is laughing about something, her eyes mirthfully scanning the crowd of waiting people. You wave your hands wildly to catch her attention, and she spots you almost immediately. Her face lights up, and she elbows Sarah in the side, making her aware that she saw you. Sarah's eyes light up as well, and she waves her hand back frantically. Then, as one, they rush towards Lisa and you.

The four of you embrace each other warmly, crying out in excitement and happiness. For a brief moment, you don't care about anything else but the fact that you are all reunited again. All four of you are smiling and giggling like idiots, hugging and squeezing each other tightly. Half-finished sentences flow in an uncontrolled manner, expressing your joy over seeing each other again, your love for each other, and everything in between.

Finally, you separate and start walking towards the exit of the airport, talking and laughing happily, the girls telling a story about summer camp that goes into one ear and out the other, but you smile and nod anyway, just happy to hear their voices again.

"Doug, did you do cardio? You're looking... fit. Did you lose weight?" Crystal asks as she walks right beside you, looking you up and down.

Your adrenaline kicks in, but you somehow manage to not let it show. "Uh, kind of. Yeah." You reply quickly, avoiding eye contact as much as possible, trying to sound casual.

"Wow, it shows! Well done!" She grins approvingly, patting your shoulder. Your stomach flutters a little when her fingers touch you, but you ignore it.

You manage to steer the conversation back to their summer camp, asking them how the activities were, who they met, and whatnot. They tell you about their trip for another ten minutes or so until you arrive at your car. You stuff the luggage in the trunk and everybody gets in. Lisa ignites the engine and you set off, your sisters continuing to share their experiences while you and Lisa listen to them with smiles on your faces, asking the occasional question.

At home, Lisa goes into the kitchen to finish dinner, calling you after her. "Doug, can you give me a hand? I need help preparing the table. Girls, why don't you get settled upstairs in your rooms, dinner is in ten minutes."

Your sisters nod, then they rush upstairs to their bedrooms. Lisa is already dragging you into the kitchen after her. She turns back to you with an intense expression on her face.

"Okay, listen carefully now," she whispers. "They don't suspect anything yet, which is good. They are also horny like you wouldn't believe. Trust me on that one, they are returning from a two months trip with basically no privacy at all. I've been there, myself. I'm not sure if this is to our advantage or not, but we'll see. How are you? Are you ready?"

You swallow hard before replying. "Yeah, I think so."

Lisa stares at you for a second, scrutinizing you, then she nods slowly. "Good. Then let's do this. Go set the table."

Ten minutes later, everything is prepared. The table has been set, the food is ready. Crystal and Sarah are back downstairs, having had the opportunity to freshen up in their rooms. Your heart is beating like mad when you sit down at the dinner table together, Lisa at the head of it and your sisters on each side of you.

On the table is a rich beef stew, with freshly baked ciabatta and salad. There's no ****, which was a conscious decision from Lisa - but your sisters don't usually drink much ****, anyway.

Your sisters notice right away that you have no place or cutlery, only a glass of water.

"Doug, what's the matter? Why aren't you eating?" Crystal asks, pointing at the empty spot in front of you.

You try to explain calmly. "Oh, uh... I'm on a new diet. And I've already eaten today. No dinner for me." You try to sound convincing enough, hoping they won't pry any further. She looks surprised for a moment, but then shrugs and turns back to her plate, continuing her meal as if nothing happened.

Lisa subtly steers the conversation towards their romantic experiences during their trip, carefully prodding them to talk about boys and sex.

"Boys suuuuck!" Sarah exclaims. "That one guy led me on so bad! I thought we were a thing, but he didn't even kiss me once the whole time we were alone! And then I saw him flirting with this other girl. Bastard!"

"Really? That's mean," Lisa replies sympathetically, nodding in agreement. Sarah vents some more about boys she met, and how it never went anywhere.

Crystal seems less upset and more amused by her sister's complaining. She's likely heard Sarah's complaints countless times before. When Sarah finally calms down, Crystal tells the story of that guy she called you about, the one that was more interested in giving than receiving.

"In the end, we split amicably," she shrugs. "He was mature enough to accept it, and it wasn't anything serious to begin with. But he was the only one I tried it with, so yeah. No love lost, no love found. How about you, Doug? Found a nice girl while we were away?"

You swallow. It's time.

"I have. She's... well, I guess she's the love of my life, to be honest." You say. Your sisters stare at you in surprise, and Lisa's fork stops halfway to her mouth.

"Oooh? Who is she? Is she cute? Where did you meet?"

"Yeah, who dares to steal my big brother's heart while we're away?" Sarah teases. "Spill the beans, Doug. And she better be worth it, mister, or I'll kick her ass."

You look up into your mother's eyes, and she's staring right back at you. Your sisters don't see her giving you an almost imperceptible nod.

You clear your throat. "Well, she is definitely attractive. In fact, she's gorgeous." You say, looking back at your sisters. They both lean forward over the table, intrigued, dinner forgotten for the moment. "She's a bit older than me, but it doesn't matter. She's... she's my everything."

You can hear Crystal chuckle, but Sarah just bulldozes straight ahead.

"Cool. You fucked yet?"

Your heart skips a beat as you blush madly. You look down, unable to answer immediately.

"Ooooh, you haaaave!" Sarah squeals, making you wince. "Alright, who is she? Tell us!"

You take a deep breath. Here goes nothing.

"It's Mom."