An Explosive Combination

You awoke gently to the orange light of the desert dawn streaking through the trailer window. Some time in the night, both you and your sister, Apogee had rolled over in the small guest bed and you were back to being the big spoon. You were unsure how her mood was going to be after last night. But you had your arm over her body and her arm was draped over yours, hugging it close like a warm blanket on a cold night.

Despite everything that had happened the day before, your morning wood in your shorts was still somehow unavoidable, and wedged firmly between your bodies. Not to be rude, you tried to back away, only for her to press herself back against you with. You were unsure if she was still asleep with a small wiggle of her hips, getting your erection, and her shorts lodged between her butt cheeks, making you throb just a little harder. A single word filled your mind...

"Fuck!"

Your mother, Delta Vee cursed as she rolled off her mattress onto the floor with a muted thud. She made a racket as she rifled through her junk to dig out the alarm clock that you could now hear from the other side of the trailer. You quickly rolled over away from Apogee, taking care to keep your morning erection hidden under the thin blanket until it could go away.

Delta shut off the alarm clock with a smack and sat up on the mattress, rubbing her forehead. She reached over to grab an old can of beer on her night stand to wake up. She gagged for a moment and hacked out an old cigarette butt before she went back and finished off the can.

"Fuuuck..." Delta groaned and got up to stagger into the bathroom to pee. At least this time she bothered to close the door. As soon as it flushed she cursed again and ran out of the bathroom, just barely pulling her shorts up as she burst into the kitchen and looked at the calendar. Her eyes were bright with a rush of adrenaline. "Fuck! That's today!"

You and Apogee both sat up. "What's today?" Apogee asked.

"My fucking... thing!" Delta yelled as she stormed back into her bedroom. "My thing at the place! Fuck! I can't brain right now, I have the dumb!"

"What thing? What place?" you asked.

"I need to get dressed!" Delta yelled. "Like, good dressed! I have a meeting at the... space place! Fuck, where are my good clothes!?"

"Um, you probably should take a shower then," Apogee said.

"Fuck you!" Delta yelled. "Argh! No, you're right!" She stormed out of her bedroom and back into the bathroom. She yelled from behind the closed door as she turned on the water. "See if you can find my good clothes! They should be in a box in my closet. And find my clean bra!"

"Since when do you wear a bra?" Apogee asked.

"Hardy-fucking-har!" Delta yelled. "Find it!"

You and Apogee both went into Delta's bedroom to try to find her "nice" clothes. "A box in the closet," Apogee muttered, trying to clear enough floor space to even open the closet doors all the way. There was only more floor mess inside. And under that...

"A box!" you said excitedly, pointing at the exposed corner of the plastic tote bin. Apogee lifted the cover.

"Oh. Whoa..." Apogee breathed.

"That's... a lot of dicks."

"Mom? Are your clothes under the... toys?"

"No! Stay out of that box!" Delta screamed. "The one up on the shelf!"

On the shelf above the hangers there was a garment box. You grabbed it and opened it. Inside was a nice blouse that looked brand new, modest skirt, and a few outfit accessories.

"Found it!"

"I should have a bra in the second drawer," Delta yelled.

"Of what?" you asked, looking around the room. "The filing cabinet?"

"Yeah, in the back, I think!"

Apogee opened the drawer and reached in, fearing the worst. There was some decent socks, a pair of work gloves, and... She grabbed a strap and pulled out what looked like a county fair slingshot catapult for pumpkins. "Wow." Apogee briefly put on the bra over her shirt and marveled at all the remaining space inside the cups.

You grinned at her. "Maybe someday."

"Did you find it!?" Delta yelled.

Apogee quickly pulled her mom's bra off herself. "Yeah!" She grabbed the box of nice clothes from you and put the bra inside. She quickly slid the box into the bathroom and closed the door. A minute later the water turned off and you could hear Delta working quickly inside the bathroom to get herself dried, dressed and ready to go.

"Hey Mom, you might also want to... brush your teeth," you suggested.

Apogee blushed next to you.

"Yeah, yeah," Delta grumbled. The bathroom door opened a moment later and she strode out with her toothbrush still in her mouth, giving neither of you nary a glance as she got a pot of coffee going.

"So what... space place is it?" Apogee asked. "Are you going to word at EASA with Dad?"

"Fuck no!" Delta growled with her toothbrush still in her mouth. She finished brushing her teeth in the kitchen and spit into the sink. "I'd rather sit bare-assed on an anthill!" Apogee winced. "It's the other one, the Canterlot Consortium of Cosmonaut Ponies."

Delta stared at the coffee pot while she combed her mane. With her arms above her head like that, you could see that her damp fur had made her blouse partially sheer. You couldn't help but stare at the dark areola of her nipple hanging out of her bra.

"Um, Mom?" Apogee pointed it out.

Delta looked down at the dark spot in her blouse and reached inside to adjust her bra while giving you a dirty look. "The fuck!? Were you really gonna just let me walk outta here like that?"

"What? No! I... I was just gonna say something!"

Delta scoffed and finished combing her mane. Her eyes scanned the countertop while she poured herself a cup of coffee.

"Right here!" Apogee said, presenting her mother's glasses to her. "Cleaned them and everything!"

Delta put them on, looked around the apartment and cringed. "Now I remember why I hate wearing these... How do I look?"

"With your eyes, Mom!" Apogee tittered. Delta pursed her lips.

"You actually look presentable. Good even! I'd hire you," you said.

"It's not a job interview!" she said defensively. "Well, not really. I'm doing a contract bid."

"What's that?" Apogee asked.

Delta glared at the kitchen clock and carefully drank her coffee over the sink to not spill any on her blouse. "Kid, I really don't have time to explain right now. I'll tell you about it when I get back this afternoon, okay?" She tossed the empty coffee cup into the sink and grabbed her satchel from on top of the fridge before making a bee line for the door. "Try not to burn the place down!" The door slammed behind her as she took off.

"..."

"..."

"I guess we're on our own for breakfast," Apogee said. "There should still be some Boop O' Roops." She grabbed the cereal box and shook it. It sounded like there was maybe one serving left. "I don't know if the milk is still good. Otherwise they're okay with water, too."

"Yeah, I know..." you groan from experience dining at your mom's trailer.

Apogee hummed as she searched the kitchen for something else. "Too bad I can't have one of your protein shakes."

The tent reappeared in your shorts. "Wha... what!?"

"Your workout mix, at Dad's house," she said. "That whey powder just needs water right?" She looked at the deep blush on your face. "Why, what did you think I..." Her eyes trailed down to your shorts and her face turned just as red. "Oh, ha, HA! No!" She laughed and covered her face. "Not for breakfast, anyway. And definitely not before you take a shower!"

"..."

"I guess I'm not super hungry," she continued. "So you can have the last of the cereal if you want. Unless there was something else you wanted to eat." You tried to not look at her crotch. She noticed you failing at that. "Oh, really?"

"Nothing!" you blurted. "I mean, no! I mean... What!?"

Apogee smirked. "You're cute when you're embarrassed. You're also obvious when you're horny. And just F.Y.I, you suck at lying."

"Nu-uh!" you denied.

She raised an eyebrow at you. "Come on. After last night, I think we're a bit past these games, aren't we?"

You huffed. "Okay, fine. Yes. But can we at least talk about last night?"

Her coy expression broke in an instant. "You don't regret it, do you?"

"What!? No! No-no-no!" You stammered. "I just- You just seemed... mad, after."

She crossed her arms and pouted. "I wasn't mad at you. I was mad at Mom!"

You rubbed the back of your neck nervously. "Well, to be fair, I don't think she knew what she was interrupting. She was pretty drunk. I tried to get her to go back to bed."

"I don't mean that!" She grit her teeth for a second. "Not just that, anyway. I mean all of it. I'm mad at her for doing that with you first!"

You gave her a puzzled look. "... Did you want her to do it with you first?"

She smacked you in the forehead. "No, you dolt! I meant- I just... Part of me always hoped that we would be each other's first. And she took that away!"

"Oh."

"Mostly, I'm mad at myself for not saying something sooner." Apogee's eyes glistened. "I wanted to. When you told me about Rose. I wanted to, but I... I chickened out. And I didn't think that Mom would... do that with you out there."

"Hey, I was just as surprised as you were!"

She shook her head. "I shouldn't have been. You're exactly her type. I don't know why I expected her to have any kind of moral compass. And... it was pretty obvious what happened when you two came back out of the water tower."

"I'm sorry."

She shrugged. "No, you didn't know. I thought you'd figure it out after what happened in the pool. I was so sure about how you felt, too. I should have said something. I should have at least been a little more direct."

"Yeah, well, I'm sorry for being so dumb."

She flicked your ear. "Yeah, you should be!" she said before finally cracking a smile. "So... how was it?" she asked.

"What?" you asked.

"The sex."

"You were there last night!"

"I meant the sex with Mom! Losing your virginity!"

"Oh. It was..." you trailed off, unable to keep the goofy grin from stretching across your face. "It was nice."

Apogee gave you a dubious expression. "Just nice?"

You remembered discussing about how much you suck at lying. "Okay, fine, yes, it was great! Amazing! Mind-blowing! Okay? Is that what you wanted to hear?" Apogee pursed her lips and looked away. "But Gee, listen, if I knew- like if I knew for sure how you felt yesterday, I would have never have gone out to talk to her. I would have... I would have much rather have done that- my first time, with you, too."

She still seemed doubtful. "Really?"

"Yes! Listen, I love Mom and all. And it was good. But she's still..." You trailed off and kicked an empty beer can across the trailer floor. "She's still her, you know?"

"Yeah..." She leaned against the edge of the kitchenette table. "So what now?"

"I think we were talking about eating breakfast."

"I meant what now about you and me," she clarified.

"So was I." You held her by her waist and sat her up on the edge of the table, slipping a thumb into the hem of her short.

"Aily, wait- at least let me take a shower first! We ran track in gym yesterday, and I didn't get a chance to-" You cut her off with a kiss. She accepted it, but still insisted after. "I was sweating all night, I must smell!"

"I know," you said without thinking. She glared at you. "I mean, no- not bad. I... I actually... kinda like it." You tugged at her shorts more firmly.

"You're so weird!" Your reassuring words did nothing to assuage her self-conscious blush. With a reluctant sigh she leaned back on the table to let you pull her shorts off. Your eyes went wide, drinking in the sight of her powder-blue panties, though mostly a much darker shade from her wetness. "Yeah, okay, you can see how badly I need to go wash- AH!"

She yelped as you leaned forward, pressing your face into right her crotch, getting your nose damp with her wetness, feeling the warmth of her heat radiating off of her. You felt lightheaded for a moment as a concentrated flood of her pheromones permeated your system. Your hands grabbed her panty straps on either hip. Her hand reflexively grabbed yours to stop you.

You looked up at her and snorted in frustration. She looked back at you with an expression of... worry? The last bastion of rational thinking screamed over the pheromone-addled animal part of your brain. You realized just how predatory you must have looked in that moment. She must have seen the hunger that you were feeling. Your expression softened along with your grip on her panties. She relaxed along with you and, after a moment, she let go of your hands and nodded. She shifted her balance on her elbow and lifted her hips just enough your you to peal off her underwear.

Apogee's wet pussy glistened in the morning light. Her smooth, pale yellow lips were just slightly parted, revealing her bright pink interior. Crowning above it was a small tuft of her pubic fur, the same two-tone green and teal as her mane. Suddenly exposed to the cool air, her clitoris winked reflexively at you, at once catching you by surprise, and enticing you closer once again. You didn't even need such encouragement, only too happy to be rid of the thin cotton barrier between you.

Apogee gasped as your comparatively cold nose came into contact with her hot nethers. If she tasted half as good as she smelled... You refused for it to be a mystery for even a second longer. You opened your mouth wide to cup as much of her vulva as you could, pressing your wide tongue flat against it. You gave her long licks, up and down between her lips. You plunged your tongue firmly into her honey hole before licking your way up and flicking her clit.

"Aily!" You felt her grab your mane. You worried for a second that she was going to make you stop, but her grip pulled you into her crotch harder as she moaned. Her grip limited your mobility, leaving your tongue to focus on her clit. It seemed to be what she intended.

You took a free hand from your sister's hip and reached under your chin to slide a finger inside her vagina. Her thighs flex and hugged your head for a moment, making her pussy grip your finger before relaxing again, letting you move it in and out of her for a time before adding a second finger.

Remembering what you could from your experience the day before, you turned your hand over with your palm facing up and you started curling you fingers inside her, hitting that one distinct spot inside her. Her moans became more rapid and desperate.

She gasped. "Aily, what are you-?" You silenced her with a deep hum, vibrating her clit under your tongue. She started to squirm on the table as you kept fingering her g-spot. You wondered just how much exactly your sister had in common with your mother. "Aily, wait- I... I think I need to go-" Your free arm wrapped around her thigh, holding her still. You could feel her muscles vibrating like a plucked guitar string each time your fingers hit that special spot. "Aily, I... I can't... I'm gonna...!" She tried weakly to push you away in a final warning, but her strength failed her. "AILY!" she cried out. She fell back onto the table as her whole body trembled and shook.

Her thighs clamped on the side of your head, muffling her cries of ecstasy as her hips bucked against your face. You cupped her whole vulva with your mouth again as she gushed into your mouth with powerful spurts. The flavor of your mother's orgasm was tainted by a lifestyle of smoking and drinking alcohol. But your sister's was so much better! Far less bitter, it was a little tart, but also sweet, like a hard candy. You gleefully swallowed her orgasm again and again just as fast as she could fill your mouth. Your lungs started to burn for oxygen just as her legs fell limp to either side of you, letting you come back up for air.

For a few minutes, the only sound was the two of you trying to catch your breath. Apogee covered her face with her hands and tried to talk between panting. "Sorry I peed."

"What? No! You didn't... That wasn't... You didn't pee."

"But I-"

"You had an orgasm."

"But I- in your mouth!"

"You squirted. Mare-cum."

"I've never done that before!" she said, still embarrassed. "I didn't even know I could!"

"Was it bad?" you asked. Apogee was up in a flash, hopping off the table and shoving you back into the booth. Just as quickly, she grabbed your shorts and pulled them off, letting your erection spring free. She pounced on top of your lap, grinding her pussy against the side of your shaft as she peeled her shirt off. She hugged your face against her pert breasts.

"That was the best orgasm I've ever had!" she purred into your ear. "Can you do that again?"

"Mhmm!" you confirm, sucking her nipple in your mouth.

"Can you do it with this?" she asked, humping against your shaft more insistently.

You reluctantly release her nipple just long enough to ask, "Wanna find out?" She answered by grabbing the back of the booth seat to steady herself, and she lifted her hips. She reached under herself to help aim your dick while you held keep her hips steady. It was much easier in the light than fumbling around in the dark.

Together you lined things up and she held herself firmly against the tip of your dick. She took a few deep breaths to help relax and you could feel her entrance slowly stretching to accommodate your girth. After a long minute, she let out a little yelp as the tip of your dick popped inside. With a little bit of motion she slowly inched her way down your shaft to your medial ring.

With how stretched she already looked, you were even more worried than you were last night. But she was even more confident with the knowledge of having conquered it once before. You knew better than to voice your concern, it would only make her more determined. You sat still and patiently let her go at her own pace until at last... she bit her lip and stifled her groan as she got your medial ring inside her.

Her expression shifted. "Okay, that actually wasn't bad at all. I think I was just anxious from last time."

"You got this?" You asked rhetorically. She clearly did. She nodded with a proud smile as her butt reached your thighs. You could feel the tip of your dick just barely kissing her innermost barrier as she settled her weight into your lap.

Once she got comfortable, she leaned forward and hugged you, whispering in your ear, "I love you."

Naturally, you hugged her back. It was strangely wholesome. There were plenty of other chaste times when she sat on your lap and hugged you. And this hug felt the same in that regard. Of course, this time you were balls deep inside your sister's pussy and she had her bare tits pressed against your chest. But still, you meant the words just the same. "I love you too."

She pressed her face into your mane. "Stay with me."

You smirked, pinned in the booth underneath her. "I don't really have much of a choice here, Gee."

Her arms tightened around you. Her hug felt almost... desperate, as though she was afraid to let you go. The bravado was gone from her voice. She sounded frail. "Stay with me, please."

You hugged her back just as firmly. "Yeah. Okay. Of course. You okay?" you asked. You felt her nod against your cheek. "Are we gonna...?" You flexed your hips a couple times.

"Yeah, just..." she shifted herself slightly in you lap. You could feel every detail of her interior against your sensitive penis. "Can we just stay like this?"

You glanced up at the kitchen clock. "Mom said she's going to be home this afternoon, so we only have a few..." You stopped when you felt her wince. "I mean, yeah. We can stay like this as long as you want, Gee."

You both sat there, simply enjoying the bliss of your complete union. Occasionally you would shift in your seat to keep your legs from falling asleep, and she would do the same, flexing her powerful pelvic muscles around your shaft as she moved. It was so slight, but it was so powerful to you both.

She lifted her face from your mane to look you in the eyes and she kissed you. You closed your eyes and kissed her back. Just as you had promised each other, it was an improvement from the first time. It was slow and patient. Your tongues didn't rush out in a slobber of horny desperation. They each met in a slow circling dance together. Apogee melted into the kiss and started to slowly rock her hips.

It wasn't the up-and-down bouncing motion you expected. She just ground her hips against you lap, getting her clitoris against your pubic bone. It seemed to please her, but you were unsure what you were meant to get out of it until the first tremors of her pleasure started. Her powerful muscles rippled along your shaft, squeezing and milking it. Her abdominal muscles flexed as she shifted her body and you could feel her cervix gently teasing the tip of you shaft. The sensation was strange, but incredibly stimulating.

With just the smallest movements, it took so little effort on her part, but she was getting the job done for both of you. You could feel her wetness dripping down your balls underneath her. And you could feel your own orgasm slowly but surely approaching.

She reached between you and started to play with her clit directly. You could hear her breathing hitch and her whole body started to shake as she came again. It wasn't a huge one like earlier, but she kept the next one coming soon enough after. It was less of a peak and more of a plateau of pleasure. However, you were very much headed towards a peak. Or rather, a point of no return before going over the cliff.

"Gee, I- I'm getting close!" you warned her. She kept going. "Gee, I'm close!" you repeated. You felt yourself flaring inside her and your balls started to tighten. With you last ounce of strength, you grabbed her hips to pull her off. "Gee, I'm gonna CUM!" She shoved your arms away and wrapped hers around you tightly with a strength you didn't expect from her lithe frame.

It was too late. Your strength failed you as you went over the cliff. Hugging you so tightly, you could feel the bulge your flare was making inside her abdomen. You could feel it swelling larger inside you as your dick throbbed and twitched, shooting powerful spurts of thick, virile seed up, deep inside your sister. Perfectly lined up inside your twin, her body weight pressed the entrance of her fertile womb firmly against your tip, forcing your rich load of semen to pump directly inside, dousing her estrus as you flood her uterus.

After cumming inside your mom, you didn't think that anything could top that feeling. But this topped it. Big time!

"Oh, f-fuck!" you barely get out between spurts. "Fuck!" It was raw reaction to the pure sensation. But it was also your reaction of helpless fear. You knew what was happening, even as it happened. You could see the bulge in her belly from her bloated uterus, but you were powerless to stop yourself from cumming, feeling spurt after spurt shoot up though your shaft. "Apogee!"

"Shh!" she hushed you and just kept hugging you tightly. Your hands pawed at her hips weakly to try to lift her but she just slapped them away. "Stay with me."

"I just came inside you!" you cried, as it it wasn't already abundantly obvious to you both.

"Mmm," she hummed.

"What if you- We need to- You need to-" your panicked words spilled out.

"Ngh!" Apogee just hugged you harder. "Stay. It's fine. Just stay."

"But what if you get pregnant!?" you ask, finally saying the word out loud.

"It's okay. I won't."

"You sure!?" you ask nervously.

"I'm sure. It's fine. I have Moon Tea. Just stay." You glanced at her belly. She looked like she was already a couple months pregnant. She could reassure you a hundred times but you would still feel nervous about it. She nuzzled against your neck and dozed.

There was no arguing with her that it did feel nice. Being able to cum inside and stay there. You wondered just how long you could stay hard after doing that. You would have liked nothing more than to fall asleep, entwined just as you were. You closed your eyes.

Just a quick snooze...

Your eyes shot open and looked at the clock. It was half past noon. You mother was anything but punctual, but she was even less predictable.

"Gee! Apogee, wake up!"

"Wha?"

"Mom could be home any minute! Get up!"

"Wha- oh, oh!" Apogee quickly blinked awake and sat upright in your lap. You felt the strange sensation of your half-turgid shaft still inside her shifting around as she moved. She moved to stand up.

"No, wait!" You grab her hips to stop her. "Don't! It'll make a mess! We have to walk together to the shower."

"No way."

"See if you can turn around."

"On your lap!?" She balked. "My legs don't bend that way!"

"Okay... maybe if I can stand up, I can carry you if you hold on."

"We can try..."

"Okay, hold on. On three. One.. two..." You hug her tightly and she kicks off the booth behind you and you manage to stand up. She locked her ankles behind your back to hold on before you fell on top of her on the table in a missionary position.

"Ow."

"It's okay, we're halfway there. Hold on." You pick her up again and keep your balance as you hug-carry her, still impaled on your dick.

She groaned. "Okay, being this full is actually getting super uncomfortable."

"Almost there." You shuffled with her to the shower shall, pinning her against the wall. "Okay, try standing."

She unlocked her ankles just before your knees buckle. Your dick pulled out of her with a wet plop followed by a gushing torrent of you cum spilling out of her pussy as she clutched her belly. You didn't even wait for her to finish dripping before you turned on the shower to quickly rinse your lower half and passed her the shower head.

She started rinsing herself off, and out. She reached over to hold your dick. "Do you want to-"

"Not right now!" You said just a bit too loudly, and you nearly slip stepping out of the shower. You wiped yourself dry with an old shirt as you frantically searched for your shorts. You hop-dressed yourself as you ran around to open all the windows and get the stank of sex out of the trailer before your mom got home and did pony-knows-what to you.

Apogee finished getting cleaned and strode naked out of the bathroom. You threw her clothes at her, as politely as you could. "Get dressed! Quick! Mom could be home any second!"

Apogee got dressed and just stood at the kitchenette counter to watch. By the time you got the trailer and yourself back to looking 'normal, you were sweating again. The two of you stood there for several minutes waiting for Delta to get home. She didn't.

Apogee opened her travel bag. "Or... she could be home literally at any point this afternoon."

"Hey, it's easy for you to say that!" you shout. "I'm the one who has to worry about her chopping my dick off!"

"She wouldn't do that," Apogee said, getting her box of Moon Tea to brew a cup. "She enjoys it too much."

Apogee sat at the table and sipped her tea while you worried about literally everything.

"Wait, why do you have Moon Tea in your bag?" you asked.

"The same reason why you have a condom in yours... Just in case." She sipped her cup. "Plus, it helps in general with estrus. I mean, not as good as you did. But still..."

"And you're sure it works?"

Apogee pointed at the guarantee on the box. "Sure enough that a simple lawsuit from Diamond Gavel should cover any unintended consequences."

"...Okay."

Apogee finished her tea and looked at the pattern of the leaves in the bottom of the cup. "What would you do?" she asked.

"What?"

"If... that happened. What would you do?"

"Can we not even talk about it?" you asked in anxious irritation. "I can already feel my mane going grey from the stress!"

"I just... wanna know. Would you run off on me like some deadbeat?"

"What!? No! Of course not!"

"What would you do then?"

"I wouldn't... I mean, I would try to do the right thing, of course!" you assured her. "Not that it's ever going to happen, right!? You wouldn't trick me into something like that, would you?"

"No!" Apogee said, knowing perfectly well what you were referring to. "We both know how that turns out."

"Ugh, I need a cigarette!" Delta Vee groused as she threw the trailer door open, startling you from your nap in the lawn chair. "I would have been home sooner, but the place had A/C." She dug through the kitchen drawer and grabbed a half-empty pack. "But they don't allow smoking there so..." She lit up and took a deep drag before looking around the trailer. "Where's your sister?" she asked through the screen door.

"Nothing!" you blurted. "I mean, who!? I mean... I think she's somewhere out back."

"Well, go find her and then come inside."

Your eyes went wide. "What!? Oh- oh! Come inside the trailer!"

Delta gave you a funny look. "Yeah, what did you think..?" She smirked. "Oh, you horndog!" She grabbed her big tits through her blouse and gave them a jiggle. "Do I really get you that worked up?" She looked around quickly before she lifted the front of her skirt up and pulled her panties to the side, flicking her clit a couple times at you. "Be a good boy and you can have a little treat later," she teased before making herself proper again. "Now go fetch your sister! I have big news."