An Explosive Combination

"At school!?" You asked in shock.

Your sister, Apogee, rolled her eyes. "Okay, I see what you mean about guys not getting obvious hints. So I'm just going to say it-"

The rusty hinge on the trailer door screeched as your mother, Delta Vee walked in for something but stopped when both you and Apogee were both staring at her. She stared right back at you both.

"What?" all three of you asked at once. "Nothing!"

Delta blinked. "Okay that was fucking weird." She walked past the two of you to the fridge to grab a beer. "So what's the play for dinner tonight? Are we doing pizza again or..." She was met with your wordless stares. "What?"

"Nothing!"

Delta threw her hands up. "Nothing for dinner! Works for me! I'll just drink mine again." She cracked her beer and went back outside.

"So who was it?" you asked Apogee once your mom was out of range. "I need to which student is the kind of filly who puts out like that!"

"It wasn't a student. It was an older mare."

"What, you mean a teacher?"

"No. It wasn't even at school."

"Fine, just tell me what you saw."

"Okay. I was on my way to school. And I saw him, outside, getting his dick sucked by her."

"That's hot. Then what?"

"Then she gave him a tit-job."

"Wait, really!?"

"I mean, I should have know he had a thing for her sooner. I saw him jerking off while watching her take a shower."

"..."

"And he came so hard, he sent his load out the window and hit me in the cheek."

"Waaait..."

She slapped you in the forehead. "It's YOU, dumb dumb!"

"Ow!" You rubbed your forehead. "Wait, I'm your brother!"

"Ha! Yeah, judge me!"

"But all that other stuff! How did you-"

"I'm not blind or deaf, and I live here! How could I not notice!?"

"But why didn't you say anything?"

"I was going to, but you were kinda going through a lot and I thought you were just trying to, I dunno... cope. I just thought that to you, Mom in the shower was just as good as any other naked mare to finally deal with that thing." She pointed at your crotch. "I wasn't about to judge you for being attracted to a family member after all. And I didn't want to give away my chances to see you... you know." She made a jerking motion with her hand.

"So how long have you felt this way about me?" you asked.

She shrugged. "I don't know. For as long as can remember feeling this way at all. From the first time I ever felt that itch down there, to when I discovered how to deal with it myself. From when I first learned that two ponies could even do that together, it was always you in my mind that I wanted to do it with."

"I had no idea."

"Really? You had no idea? Ailly, I love you, and you're a smart guy. But sometimes you're dumber than a bucket of rocks."

"Yeah, I've noticed."

"But you never noticed any of my hints?" she asked. "Just the other day in the pool, when it felt like you were smuggling a baseball bat in your shorts, and I practically gave myself a wedgie with it?"

"Ah! I knew it! I knew you were doing that on purpose!"

"Then why didn't you say something?" she asked.

"The same reason why you didn't ask me why I had a boner for you. What if you were wrong and it was actually for Miss Whirlpool?"

"Our instructor!?"

You quirked an eyebrow at her. "Is that really the weirdest part about any of this?" You asked. She shrugged. "My point is, what if I was wrong? What if you really did do that unintentionally and I asked why you were rubbing your butt on the boner I had for you. Now I look like a perv."

"I mean... you are. But then so am I. And so is Mom."

"So is Mom, what?" Delta asked from outside as she walked towards the door again. She walked into the trailer on another lap through the kitchen to the beer fridge before heading back out to the open hangar.

"Uh, sweating so much from this heat wave," Apogee said quickly.

"Fucking right!?" Delta grumbled as she cracked another beer and walked back out.

Apogee watched her walk away and waited before turning back to look at you. "Okay, we need to keep our voices down, so..." She shifted closer until her thigh was against yours. Despite how much you thought you and your mom had gotten it out of your system, you still pitched a tent. "That's for me, right?" she asked. You blushed and nodded. She grinned. "Cool. I did that! It's like having a superpower!"

"Heh, yeah, kinda."

She shifted in her seat a bit. "You know, Ailly, you kinda have a superpower over me, too."

"Oh yeah?"

She nodded and grabbed the hem of her shirt, pulling it tight, showing her hard nipples poking through the thin material. And it definitely wasn't cold in there. "And also..." she trailed off and turned a darker shade of red, chickening out on actually saying it.

"What?" you coaxed her. She hopped over a seat away from you. She took your had and placed it on the seat where she had been. You could feel that it was not only warm, but also quite damp. "Oh, wow."

"Yeah." She giggled and blushed harder, covering her face with her hands.

"What's this?" You asked. "I've never seen you be shy before. When have you ever cared what someone thought about you?"

"I care what you think about me."

"I already told you that I love you."

"I don't just mean like a brother."

You glanced at the tent in your shorts. "I think that part is pretty obvious too." The clatter of Delta tripping over some debris somewhere outside reminded you both of the situation. You lowered your voice to a whisper. "Look, obviously we can't do anything about this right now."

"We can do this." She leaned over and kissed you. On the lips. You jerked back at first, if only in surprise. But then you kissed her back. Nervously at first, same as her. despite everything that had happened recently, you were just as inexperienced at kissing as she was. It was awkward, but real. She sat back in her seat.

You smiled. "That was... nice."

She smiled back, clearly as unimpressed as you were. "We can work on it."

"Okay, yeah, for sure."

Your stomach growled. Your mom might have been content to drink her dinner (after the two protein shakes she had earlier) but you actually needed something to eat. Opening the freezer you found, "Hot Pockets or corn dogs."

"Ugh, I'm so done with Hot Pockets," she groaned. "A couple corn dogs for me I guess."

"Easy enough." You toss them into the microwave for her and after a couple minutes, "Bone apple teeth!" She laughed as you set the paper plate in front of her. Next, you put the Hot Pockets in the microwave. You set it for the time indicated on the box, but you knew that was a crap shoot, and you didn't know the temperament of the microwave well enough to dial in the precise amount of time to get it to not still be frozen inside, but at the same time, not molten lava. Erring on the side of caution, they come out edible, if a bit lukecold. Not that you really noticed. You were too busy watching your sister eat her corn dogs. You made a mental note to add bananas and popsicles to the grocery list.

The cloudless sky surrounding Las Pegasus gave the setting sun little to reflect off, which meant that night came quickly after dusk. The crickets led the symphony of desert insects as the landscape came alive in a serene chorus of nature.

"Fuck!" Delta yelled, tripping over something in the dark. She staggered towards the trailer door and threw it open. "Alright shit-heels, time to stop running up my electric bill!" She reached for the pull-chain on the kitchenette light, missing the first time but getting it the second time after squinting. "Lights out!"

In the dark, you could hear her crush her last empty before throwing it at a random wall and them flopping forward onto the pile of dirty clothes protecting her mattress on the floor. You and Apogee wait a little while before you hear your mom start snoring like a truck downshifting on the freeway.

"Yeah, I think she's out," you said.

"We should probably get to bed, too," Apogee said.

"Why? It's not like we have to get up early. There's no need to go to sleep on time."

"I didn't say anything about sleeping."

"Gee, if Mom wakes up and catches us..."

"That's why we need to be quiet," she said as she shifted the kitchenette dining booth into the pullout sleeper bed. She climbed in and laid down, patting next to her on the thin pad that was laughingly called a mattress. You laid down next to her as you always had on you side. She scooted behind you and wrapped her arm around your chest, pressing her nipples against your back. She moved her hand from your chest to her own for a moment, before hugging you again.

"Yes. I can feel those," you whisper. You could hear her lips smack as she grinned. She slid her hand up under your shirt to touch your bare chest, specifically giving your nipple a light squeeze. Just to be playful, not enough to hurt. Then she slid her hand down along your torso to the hem of your shorts. "Gee..." She ignored you and ran her hand over the surface of your shorts, feeling the outline of your dick inside at half-mast. She gave it a light squeeze through the thin material. That was all it took to get it to full mast, swelling against the paltry rubber waistband straining of contain it. With a simple flip of her thumb, your shaft sprang out of the top of your shorts. Just as quickly, her hand was on it, gripping the sheer girth of it.

"I can't even get my hand around it," she said in a breathy whisper. She tried to move her hand up and down along its veiny texture, but dry as it and her hand were, it tugged uncomfortably at your sensitive skin. You put your hand on hers to stop her movement. "Is this why you always sleep like this?" she asked. "Laying that way?"

You didn't realize how dry your throat had gotten. You made a sort of squeak sound before you cleared your throat. "Uh, yeah." You felt her hand on your shoulder, beckoning you to roll over towards her. You rolled over and found yourself face to face with her in the small sleeping space.

"Hi," she greeted.

"Hi," you replied on reflex. She leaned over and kissed you again. In the dark she seemed more adventurous as you felt her tongue on your lips. You offered your own to meet hers for a moment. before she broke the kiss. "That was..."

"Weird?" she suggested.

"I was going to say, better."

"Yeah?" she asked.

"Yeah."

"Ailly?" she asked.

"What's up?"

She took your hand with hers and she held it against her chest. You could feel her pert nipple under your palm. "I know they're not as nice as Mom's, but..."

"They are nice," you assured her, giving her pert boobs a light squeeze. True, they weren't the heaving melons your mom had that you could easily slide your dick between. But her apple-sized boobs filled your hand well enough. You carefully felt the eraser-tip through her shirt, giving it the lightest of pinches with you finger and thumb. You could hear her suck in a breath through her teeth.

Her hand grabbed yours again and pull it away from her boob. For a moment you were worried that you had done something wrong, or worse, that you had actually hurt her. She pushed your hand down just enough to get it under the bottom of her shirt before pulling it up under it. Taking her direction you slid your hand up along her tone abdomen to her chest again, feeling her naked breast directly with you bare hands. With her free hand, she went back to feeling your bare penis laying between you.

Laying so close together, breathing in the same space made it very warm very fast. She grabbed her shirt and lifted it up to take it off. But you were faster, shifting yourself down a bit to kiss and lick her exposed nipples. Her hands abandoned her shirt and hugged your head against her breast. It seemed like a maternal instinct that all mare must have. She reached down to touch your dick again, but you had move out of her range. She had to wait until you were satisfied with sucking her nipples. It looked like it was going to be a very, very long time.

You felt her hand on your forehead. "Ailly, you're making them get tender," she moaned.

"Oh, sorry." You returned to your usual position on the bed next to her as she rolled over, which you took as your signal that things were over for the night. That was fine in your book. It had been a heck of a day.

She backed up against your body. "Aren't you going to hold me?" she asked.

You shifted closer against her as the big spoon and wrapped your arm around her midsection to hold her close against you. She wiggled her butt against your still-exposed erection, trying her darnedest to give herself a wedgie with her panties. She grabbed your hand with hers again. You weren't sure if she just wanted to hold your hand, of if she was going to have you go on another expedition up her shirt.

She guided it downwards this time.

"Gee..."

She only reply was to guide your hand inside her shorts and place your palm over her crotch. Even through the thin cotton of her panties, you could feel how hot and wet she was. Her hand was symmetrical over yours and her middle finger pushed yours a little firmer against the material. You could feel it pressing her panties between her pussy lips. She wiggled her finger from side to side and you mimicked her directions. You could feel the small nub of her clitoris under your finger. Though despite finding it, she seemed to be getting increasingly frustrated.

She reached down and lifted the hem of her panties out from under your hand. Not one to decline such an invitation you slid your hand inside her panties and placed your palm over her bare vulva. You found the place where you had left off easily enough, but with this new access, you explored further. You slid two fingers between her lips, downward, lower until your fingertips grazed the entrance of her vagina. You adjusted your angle slightly and reading your actions, your sister did what she could to part her legs a bit more and let you slide your fingers inside her.

It was just a couple knuckles at first, but with how wet she already was, you were able to get the full length of you middle and ring finger inside her and moving smoothly in and out of her. Her moans were stifled as she bit her pillow. The only sound was the wet shlorping of you finger-blasting your sister's tight cunny. Between that, and the feeling of her pussy around you fingers, and your dick grinding against her ass cheeks, you felt like you could probably cum just from that.

She stopped you just long enough for her to reach down and pulled her panties along with her shorts half-way down her thighs to give you more space. Before you could get back to fingerfucking her, she reached behind her to grab your dick and guide it between her legs.

"Gee,"

"Shh!" she hushed you as she clasped her thighs around your dick, holding your tip with her hand as she shifted back and forth to rub her pussy against the side of your shaft. Once you figured out what she was going for, you helped by doing your part of the humping, getting your shaft slick with her wetness as you moved the full length of it between her thighs. This would definitely get you to cum. But at least the mess would be on her side.

You felt her hand on your tip, slowing your pace and stopping you to let her specifically rub it against her pussy. She shifted herself and her angle. She pressed your tip against her tight entrance. It was plainly obvious what she was trying to do. It wasn't for lack of lubrication. Either she was in the wrong position, tense, or just plain tight, it wasn't going in. As much as you wanted it too, the last bit of cautious reason in your mind objected.

"Gee,"

Shh!" She hushed you again and pushed her hips harder against your tip in more frustration. She was almost bending your dick with how much force she was using. You could feel the muscles of her pussy starting to give. Even in your limited experience, you could anticipate what was about to happen next. Your tip popped inside, followed by several inches of your dick as it straightened back out like a spring. Her sharp inhale was the only warning you had to grab her pillow and push it into her mouth to muffle her cry.

"Sorry-sorry-sorry!" you whispered frantically as you hugged her and she hugged herself, bringing her knees up to her chest from the sudden discomfort. "Don't move. I'll take it out."

"No!" she whispered sharply. "I'm fine. I can... Just give me a minute."

You waited motionlessly. Though try as you might, your dick still involuntarily throbbed in time with your rapid heartbeat. She could plainly feel it inside her, the way she was shifting and squirming to try to get used to the feeling. You could definitely feel it inside her. It was surreal, finally being inside your sister after all those fantasies.

With your mom it was different. Yeah, she was your mom, but it was easier with her being this older mare that you only saw occasionally throughout your life. It gave the relationship some distance that made the sudden lust more acceptable somehow. But with your sister Apogee, she was a filly you had seen almost every single day of your life growing up side by side with her. So to finally do this with her was just somehow so much more intimate.

"Okay," you heard her whisper. She rolled her hips slightly and pulled away. You resigned to the feeling of leaving her warm confines, probably forever after this bad experience for her. But instead, she pushed back, getting a couple more inches of you inside her. She reached back and touched your hip. "Come on."

"Okay..." You grabbed her hip for reference and carefully pushed forward, easing more of your dick inside her. Unlike the thick, foal-bearing hips of your mother, your sister's lithe form hard you worried that you were going to break the poor filly in half. You stopped when you felt your medial ring bump against her stretched entrance. Her hand went from your hip to your remaining exposed shaft before grabbing your hip again.

"Keep going."

"Are you sure?" you asked.

"Yeah, I can... I'm ready."

"Okay, hold on. I'm gonna push..." You applied a steady pressure at first before you started giving little gentle humps against her. She surprised you by humping back harder, making your medial ring pop inside her. Her bit pillow stifled her groan. "You okay?" you asked. She nodded but all you could hear was her rapid breathing for a minute before she calmed herself. Her hand on your hip pulled at you, insisting that you hilt her at last. You wondered wear her organs were getting shoved around inside her petite frame by the time your hips met hers. You could feel the tip of your dick bottom out inside her, just barely kissing the final barrier at the back of her vagina.

"So good," she moaned. In taking your entire length, you completely filled your twin sister, a perfect fit like lock and key. You started to move your hips but she just held you still. "No. Stay. Stay like this with me tonight. Please."

"Um, okay." You wanted to fulfil her request and sleep all night balls-deep inside her. But you didn't know if you would go soft in your sleep or start humping involuntarily. either seemed equally likely. But also neither did as she showed no such restraint. She moved her hand to her pussy and started playing with her clit. That was all fine and good, but you could feel her vice-tight pussy rhythmically gripping you as she did. Her body's muscles involuntarily milking your dick, trying to draw out every drop of your seed deep inside her fertile body.

She stifled another moan as you felt her orgasm from her masturbation while you were still inside her. It was hardly unfair, since it was feeling just as good for you. Quite in fact she was doing all the work, or rather, her pussy was, to get you off. But there in laid the problem. As she gave herself another orgasm, you could feel your own teetering ever closer.

"Gee, I can't sleep if you keep doing that. I... I'll cum if you don't stop."

"Okay." She didn't stop masturbation.

"No, I mean I'll cum inside you."

"Okay."

"No. Not okay! You either need to stop or let me pull out."

"No!"

On the other side of the trailer, a glass bottle clattered and rolled across the floor. In a flash, you pulled the thin blanket over the both of you, staying still and silent even as Apogee's orgasm quivered around your dick.

In the dark trailer you could hear the uneven steps of your mom shuffling towards the bathroom to sit down and pee. Loudly. You both continued to lay motionless and waited to hear her shuffle back to her mattress and flop back into it. She stopped halfway through the trailer and shuffled over towards you. Your heart stopped in your chest as she knelt down and you felt your mom's hand on your shoulder, giving you a little shake.

"Ail-ron," Delta slurred.

"Go back to bed, Mom, you're drunk," you whisper at her.

"Shh! Dun wakeup Ap-gee!" she whispered much louder. "Come here."

"What do you need?" you asked impatiently. You could hear her lick her lips.

"Momma needs her midnight snack. Lemme suck ur dick."

You could feel Apogee tense up beside you. This was not at all how you thought this night was going to go. "Mom, go to bed."

She shook you more insistently. "Said you wanna me fer urself, so yew- a stallion's gotta provide!"

Apogee subtly elbowed you in the ribs.

"Okay, fine," you whispered as you slowly started to pull out of your sister's pussy. "I just need to... slide out... of bed." After shifting your body nearly the entire length of your dick Apogee helped to pull away at the last bit by rolling away, taking the blanket with her. Pulling out at last, you rolled over out from under the blanket to the edge of the bed, with your erection flopping over with you, smacking your mom in her tits.

"Ah, come to mama!" she said, grasping your dick with her hand. The scent hit your nose as soon as you pulled out but it suddenly struck you that your mom would be tasting your sister's pussy juices on your dick. Delta opened her mouth and ran her tongue up along your shaft. She smacked her lips. "Damn, I still taste great on you!" She slurped up the rest of Apogee's nectar off your shaft before sucking your dick in earnest.

You were already close to coming before she got there. It wasn't long before you flared in her mouth and started cumming. Blacked-out drunk and half-asleep as she was, she still swallowed down all you had to give. She pulled her mouth off with a wet smack. "Ha! Quick shot! I still got it!" she said before standing up. She reached out in the dark and pawed at you, finding your dick again and tugging on it. "Come to bed and fuck me."

"Mom..."

"Cummon! I know you wanna."

You felt Apogee subtly push her foot against your back, literally kicking you out of her bed. "Okay fine." You followed after your mom as she pulled you along by your wilting erection to her mattress.

She bent over in front of the mattress and swished her tail to the side. "Put it in."

Cumming so recently, you didn't have a hope to restore your erection so quickly. But that didn't stop your hand from trying. Your other hand improvised to buy time. After all, she didn't say what to put in. Aiming in her approximate direction you poke your finger against her pussy. She made a sort of yelp sound that turned into a drunk giggle before she fell forward onto her mattress.

"Mom?" you called to her in the dark. Her only response was prompt snoring after having passed out. You felt a mixture of disappointment and relief. You turned to go back out into the trailer and scanned the floor to find her panties. You went back to her room to toss them on top of her before you left and closed the door securely behind you. You carefully made your way back to the guest bed and climbed in next to Apogee.

"Here's yours," she said, handing you your shorts without rolling over to look at you..

"Thanks. Did you still want to..?"

"No," she said curtly. You realized that she had completely dressed herself again.

"Oh... Okay."

You laid down next to her, facing away as before.

This night had just gone from the best thing ever to the worst thing ever.

As you laid in the dark silence, you felt your heart breaking all over again.

...

Until she rolled over behind you and hugged you.

"I mean, yes I still want to, but not tonight, anyway."

You let go of a breath that you didn't realize you were holding.