It was mid-morning, right around the time I'm usually getting up for the day. I was laying on the bed on my side, still covered by my blankets. There was a knock on my bedroom door.
"Uh...come in," I said.
Dad opened the door and poked his head inside my room.
"Hey Tom, just reminding you that we leave for Grandma and Grandpa's in a few hours, so make sure you're all packed," said Dad cheerfully.
"S-sure thing Dad," I said, a little preoccupied.
"By the way, have you seen your mother?" asked Dad.
I certainly had. Mom had snuck into my room twenty minutes ago, as had been her frequent habit the last two weeks. Currently, she was hiding under the covers with my cock up her ass, another habit she'd recently acquired.
"Uh, no, Dad. I haven't," I said as Mom slowly ground her ass against my pelvis, my raging cock wedged firmly inside her asshole.
"She must have gone out back to her garden, she mentioned needing to get some seed in the rear," said Dad casually.
I'll bet she did, I thought.
"Well, I better find her and make sure she's packed," said Dad.
Mom's asshole was flexing on my thick cock. I had both hands clamped on her mouth to stifle her moans.
"Don't worry, pop. She's definitely packed," I said, burying my cock to the hilt as Mom squirmed in pleasured agony.
"I sure hope so!" said Dad. He closed the door and I could hear him heading downstairs. I threw the blanket off Mom, revealing our naked, intertwined bodies.
"Fill my butt with cum in the next two minutes and I'll suck your dick in the shower," Mom offered lustily.
"Is that a reward for me, or for you?" I asked with a smile. She slapped my arm playfully and smiled back. Whoever it was for, I picked up the pace of my humping, preparing to dump my load in my Mom's sweet ass.
The last two weeks had been a blur. After fucking Mom in the family minivan with Dad driving, she and I had fucked an absurd number of times. I didn't even bother to count; it felt like we were always fucking. It would have been easier to count the Moments we were in the same room without my dick being inside her.
Like me, she was on summer vacation. I was home from college and she was on break from her job as a teacher. That left a lot of free-time for us to copulate, and we would copu-late, early, and all the time in between.
The only thing that might have slowed us down was that Dad was working summer hours at his job so was at home much more often than usual. Ironically, though, Dad being around probably made us fuck even more, since Mom and I seemed to have developed a kink for having risky sex in close proximity to him.
We had fucked standing in the hallway outside of his home office while he was on an important teleconference. Mom had stroked me to release under the kitchen table during breakfast (more than once). On his birthday a few days ago, Mom had smashed a piece of his birthday cake onto my cock and asshole and licked me clean while he played around in the backyard with the little toy drone I'd given him as a present. Later that night, I snuck into their bedroom for a long fuck with her as he lay snoring next to us. It was a day.
About the only thing Mom and I hadn't done much of was talk about our situation. I'd gotten over my initial reluctance towards incest (your uber-MILF mother being sexual dynamite will do that) but I was still shocked how quickly Mom had taken to it. Like Dad, she had always seemed like a very milquetoast person. She certainly had never talked about sex in front of me. In fact, until we'd started fucking eachother, I'm not sure I'd ever heard her swear.
But, she wasn't offering any explanations for her actions and I didn't want to press my luck. A gorgeous, busty MILF with a killer ass and a mouth that could suck out your soul wanted nothing more than to drain my balls half a dozen times a day. That she was my Mom was a minor speedbump on our non-stop sex highway.
Anyway, even if I'd wanted to talk about it, we were now in the shower and her mouth was full. I think it had probably taken me more than 2 minutes to cum in her ass, but she'd had a pair of orgasms in that span which put her in a giving mood. As she expertly swallowed my cock, Dad came knocking at the bathroom door.
"Hey, I think your Mom must have gone to grab something to eat," Dad said loudly through the door, "Probably wanted something in her stomach before the long car ride."
I looked down at Mom slurping happily away at my knob.
"I think that's very accurate, Dad," I called back.
"Anyway, when you're done in there, would you mind coming down to help me load up the van?" Dad asked. I wished he would just go away and let Mom suck my cock in peace, though it was always thrilling to be talking to him while my dick was inside his wife.
"I just need a few more minutes, Dad" I said, looking down at Mom sucking on my nuts, "Then I'll cum."
"Thanks, son, I really appreciate it," said Dad.
True to my word, after I'd filled his wife's mouth with hot jizz, I went down to help Dad pack up the car. There really wasn't much to load up. I'd secretly been hoping that Mom and I would be forced to share a seat as we had two weeks ago, but it wasn't to be. Dad had even set up the front-passenger seat all nice with some magazines and snacks for Mom. He was a sweet guy; it almost made me feel bad about what Mom and I were doing. Almost. Sorta.
Mom came out, wearing a cute, flowy skirt and top.
"Hey! Where have you been hiding?" asked Dad, giving her a quick peck on the cheek.
"Oh nowhere, just laying in bed then had a shower," said Mom, shooting me a glance.
"Well I hope Tom left you some hot water," Dad joked.
"Oh yes," said Mom, "It was very, very hot."
Dad went back to loading the car and I pulled Mom aside, out of earshot.
"Looks like we won't get a repeat of our last car ride." I said, gesturing to the empty front seat.
"Phooey," said Mom, making a little mock-pouty face. She grinned, "Hopefully we'll find a way to get our rocks off at your Grandparents..."
"I've been meaning to talk to you about that," I said, nervous about the ground I was about to tread, "You and Grandpa..."
Dad called for Mom's help and she flashed me a smile and went to lend a hand. I sighed. One of the stranger revelations of the last two weeks had been that Mom might possibly have some sort of sexual relationship with Grandpa (Dad's Dad). I'd been trying to ask Mom about it for a few days now, but I wasn't really sure what to say. How do you ask your Mom if she's fucking her husband's Dad, especially when you're also fucking her? They don't cover that one in health class.
Alas, I never got the chance to ask again. We hit the road a short time later, and two hours after that we were pulling up to Grandma and Grandpa's house.
Grandma opened the door and immediately threw her arms around me, wrapping me up in a great, big hug. As I always did (at least since I hit puberty) I pretended not to notice the diving neckline of her top that showed off an impressive amount of cleavage. I also tried to ignore the feeling of her massive, soft titties smooshing against my chest as she hugged me.
She hugged my Dad in a similar fashion and gave a slightly less enthusiastic hug to Mom. Their relationship had always been somewhat cool. Not hostile, but something just a little bit off.
We went inside, Grandma asking us all sorts of questions and helping with our bags. From the back of the house, Grandpa entered.
"Well, welcome, all!" he said, beaming as usual.
He shook Dad's hand, then mine, clapping me on the back. I watched carefully as he gave Mom a hug, but I didn't notice him react any differently than with Dad or I. Mom, however, seemed much happier to see him than she had Grandma, and her hand trailed for a Moment down his arm as they broke their hug.
"How was the drive?" asked Grandpa.
"Oh the usual," said Dad, "You get this family in a car and it'll be a pretty dull affair."
Mom and I shared a quick glance.
"Oh by the way, Mom," said Dad, "We hit some antique stores a while back and Tom found a great oil can for your collection."
I dug through some bags and found the can, which I presented to Grandma. She was delighted.
"Oh it's wonderful!" said Grandma, "I've added a few to the shelves myself since your last visit. Tom, why don't I show you."
"Awesome!" I said, internally groaning. Somehow Grandma had gotten the idea that I shared her weird hobby and now I'd get to listen to even more boring stories about it.
Grandpa cleared his throat.
"That reminds me, Beth," he said, addressing Mom, "I've been trying to perfect that pie recipe you gave me and I can't seem to get it quite right. Mind helping me out?"
My ears perked up.
"Of course!" said Mom, "I'd be happy to help you with my pie."
Ok, now that I was on the "outside" of one, I could not fucking believe that Dad has never once picked up on any of these innuendos. But, true to form...
"You all go ahead, I've got some more things to get from the car, then I'll get started cooking up dinner," said Dad.
We broke off: Dad to unload the car, me with Grandma to look at vintage oil cans, and Mom with Grandpa to deal with his urgent "pie" problem. I tried to shoot Mom a "WTF" look, but she seemed to only have eyes for Grandpa at the Moment. I did notice that I wasn't the only one who seemed unamused: Grandma stared down Grandpa for a long Moment before taking my arm and leading me into the other room.
For the next half-hour, Grandma droned on endlessly about her oil can collection. Normally, I'd zone out by trying to sneak peeks at her tits, but this time all I could think about was what was happening elsewhere in the house. I had a pretty fair notion that Mom had fucked Grandpa before, and their little coded conversation had pretty much sealed that idea. I found myself kind of angry. How could she cheat on Dad? Well, ok, that argument was a non-starter I guess. But with a family member? ...Yeah, that didn't really work either.
Ultimately, I settled on being frustrated that the woman I was fucking was getting fucked by someone else. You had to boil away all of the really screwed up angles to it, but that was the crux of my frustration. I stewed in silence.
"What's wrong, sweetheart?" Grandma asked.
"Nothing, Grandma," I said, unconvincingly.
"Well there must be something," said Grandma, sweetly, "Usually you can't take your eyes off my breasts, but you've hardly looked at them."
I nearly choked on the iced tea I was sipping.
"W-what did you say?" I sputtered, certain I'd misheard her.
"My breasts, Thomas," she said, casually, "What's the matter, do you not like staring at them anymore?"
