"I'm not gonna freak out, Rob," Guy assured me. "I'm just surprised, that's all..."
I smiled at him again to show that, even though he was quite visibly shaken by what he was seeing, I was more than comfortable to have my son's mouth slurping up and down my large erection in front of him. At twenty-one-years-old, Jake was very accomplished at giving blowjobs, having perfected his skills on a succession of very grateful university buddies.
"How long have you guys...?" he started to stammer before laughing incredulously and calling out, "Wow! He's noshing you off, Rob! Your kid is actually sucking on his dad's big dick!"
"It's been a couple of months," I told him, gently caressing Jake's hair as he very boisterously fellated me. "Jake and I have come to a very... how should I put it... 'serviceable' arrangement."
"I'd say!" Guy laughed, now with more humour in his face. "What, you suck him he sucks you, kinda thing?"
"Well, yes, we do have a give-and-take approach," I agreed, now taking my hand away so that Guy could better see my son's face working the length of my upright cock. "But we don't limit ourselves to fellatio... we use each other for relief in a variety of different ways."
"Yeah?" Guy grinned, clearly starting to come to terms with what had been an unexpected revelation. "You guys are... you know... doing each other up the arse...?"
"We offer each other anal release, yes... when one or other of us feels like full penetration..."
Guy grabbed Jake's hips again and started fucking him quickly and roughly. "Aw yeah!" he chuckled, now enjoying watching Jake attend to his dad's thick shaft while his own was tightly stimulated by the same young man's bowels. "That is so fuckin' hot! I gotta see your Jake fuck you, Rob... see how much he likes a bit of daddy's big hairy butt!"
Jake pulled off my cock and laughed, "You wanna see how much I like my old man's arse? Go on, dad, turn around... let me get my face in your crack!"
"Fuck yes!" Guy cried out. "Shove your arse in his face... make him lick you out!"
I chuckled, pushing myself up to change position. "I'm guessing this means you're okay with Jake and I being sexual together...?"
"Okay with it?" Guy laughed, now driving himself in and out of my son's squat backside with fast, furious strokes. "I fuckin' love it!"
I turned around to present my two large buttocks to Jake's face, and Guy went on, "I was just a bit poleaxed when he went down on you, that's all... I so wasn't expectin' it..."
Jake pressed his nose into my abundantly forested rear trench and Guy guffawed uproariously.
He pushed the back of Jake's head to plant his face squarely between my cheeks and called out, "Yeah... that's it! Get a nice deep sniff of daddy's ripe gash!"
Jake inhaled loudly, savouring deeply and deliberately the pungent odour of my coarse wiry bum-hair, and Guy bellowed, "Fu-u-uck!" at the top of his voice, with his hips cracking frantically against my son's muscular behind.
"Lick it!" he cried out at the top of his voice. "Lick your dad's skanky hole... stick your tongue right up it!"
Jake made munching sounds to make it clear that it he was sloppily eating his father's arsehole, and I chuckled, "We enjoy rimming... fingering... a whole array of different shared activities..."
"But best of all you like to fuck!" Guy panted, slamming his cock in and out of Jake's bum like a hammer-drill. "You take it in turns, don't you? He does you hard up your arse and then you turn him round and do him!"
"Well, it's not really that prescriptive -" I began before realising that my friend was experiencing his second climax of the evening, shooting his seed in rough spasms up into Jake's bowels.
He grunted gutturally, discharging rope after rope of his thick cream into my son's bum and then gasped, "Oh fuck... I wanted so much more of that... that was fuckin' awesome, guys!"
He collapsed over Jake's back, sweating and struggling to regain his breath, and Jake pulled out from licking my anus and whispered, "D'you wanna show him how we fuck?"
"Maybe tomorrow," I muttered, unsure of how Guy would respond to our intercourse now that he'd spent himself twice. He was obviously turned on by our sex while my son's bum was showing his cock a good time, but once it was spent and was lolling floppy against his thigh, I was concerned that he might take a less enthusiastic view.
But Guy soon dispelled my worries on that score too.
As we cleaned up in the bathroom and got ready to sleep, he grinned at us both and said, "Thanks for sharing that, guys!"
"I wasn't sure how you'd feel about what you just saw," I said, "in the cold light of day, as it were."
"I think it's amazing... it just blows me over that a bloke and his son can be so cool with each other that they can play around together when they're feeling horny."
I beamed at the compliment and Jake spat froth into the sink where he was brushing his teeth. "You don't think it's weird, then?"
"Not at all," Guy replied. "As long it's just for fun. Why, do you?"
"No," Jake agreed. "It's kinda like wanking off... just shooting your muck... but we do stuff with each other... that's all."
"I get that," Guy smiled back. "That's what's so great about it!"
As I stood over the toilet bowl to take one last pee before turning in, Guy grabbed his own toothbrush and started squeezing out some toothpaste from a small tube. He said, "I mean if you guys were lovey-dovey... you know, kinda kissing and stuff... then, yeah, that would be weird... but as you're just messing around, I'm well up for seeing more!"
Jake laughed, throwing his stuff back into his toiletries bag, and Guy smiled over at me, starting to brush his teeth.
I smiled back but I could feel my cheeks blushing scarlet at what he'd said. I had once kissed Jake full-on on the lips during our sex, and I could remember in uncomfortable detail how thoroughly I'd enjoyed it. It had caused me to cum very heavily - had simultaneously caused my son to climax explosively too - and the one saving grace of the incident was that Jake had been too drunk to have any recollection of it.
===
I awoke just after seven and glanced over to see Jake sitting upright in bed with his hand slowly sliding up and down his fully engorged erection which was poking thickly upwards through his straining boxer fly. He had his headphones on and was watching a movie on his phone. I got out of bed, taking care not to wake Guy who was still soundly sleeping, and Jake glanced my way so I smiled over at him. He smirked back and I was surprised to see that the porn he was using to masturbate was lesbian.
"You sleep okay?" I mouthed, aware that he'd have two girls whimpering extravagantly into his ears.
He pushed his headphones aside and nodded, "Yeah, no probs. I just woke up with a stalk-on. Often happens when you're the only guy in the room who didn't get to cum."
"Oh, sorry about that," I chuckled. "It hadn't really occurred to me."
"You never think of my needs!" he hissed melodramatically and then broke into a broad grin to show he was just being silly.
"You okay keeping it solitary?" I asked. "I'd be happy to help you out if you'd like me to."
"You know what'd be cool," he chuckled. "If we strip off and fuck right here, so that Guy wakes up and sees us in all our daddy-boy glory!"
"Oh my God, that would be so funny! I can smile casually across at him... be like, 'Oh, good morning! Did you sleep okay?'... while I'm briskly pounding against my son's bum!"
"You don't get to do me... I'm gonna be the one doing the pounding!"
I shook my head. "It's my turn, I think you'll find. You did me last week bending over the kitchen sink."
"I thought we weren't being so 'prescriptive'," Jake grinned, using my words against me as he so often does. "And in any case, Guy did me up the arse last night and I sucked you off and rimmed you. I want a turn for myself sometimes..."
"Okay," I sighed, glancing over at Guy who was still sprawled out and senseless. "You can do me."
Jake grinned triumphantly and then switched off the lesbian porn, muttering, "Looks like the girls are gonna have to wait... daddy's butt needs Jakey's full attention!"
I went over to fish my lube out from my rucksack and prepared my backside to receive my son's cock as quietly as I could. Of all the male lovers I take these days, Jake is easily the most well-endowed, not only in the magnificent length of his erection which often feels like it's jabbing against my liver, but also in his sphincter-stretching girth which can take several hours to fully recover from.
Not that I'm complaining: far from it. Jake has proven to be a most engaging bed-mate, enjoying strong, physical tussles with his father as foreplay and never ceasing to delight and surprise me as we wrestle cock-to-cock. He penetrates roughly, asserts himself vigorously and uses every contour of his veiny penis to fully pleasure us both. Without exception, he waits for me to climax before allowing himself to let rip with his own copious outpouring, and there's something about knowing that the huge phallus lodged up inside me belongs to my son that is, to me at least, unaccountably arousing.
He pulled his t-shirt and boxers and stood naked at the foot of his bed, looking breathtakingly tall and muscular. He was working out daily in the town gym and the bigger one they have at uni, and both the swell of his biceps and the sheer bulk of his chest showed how his efforts were yielding spectacular results.
His cock was fully aroused and arching proudly upwards from his two large, sagging balls. His foreskin was pulled right back from the huge purple helmet which glistened ready and expectant with the thin slit at the tip gently streaming with precum.
Mine was growing longer and thicker but still drooping downwards with the pink head just starting to poke out from my ruffled foreskin.