It's odd but strangely compelling to watch your own son masturbating right there in front of you. I was fascinated to see how different his technique was from my own - his hand seemed so much more frantic and his fingers more agile - while marvelling at so many physical similarities between us.
His cock was ever so slightly bigger than mine, but other than that our organs were almost identical in every respect. His bulbous helmet was a deep shiny purple the way mine gets when I'm pleasuring myself, while the great, swollen shaft of his manhood had only the same, light coursing of veins that mine has. He had a raised thick ridge running down the underside of his erection every bit as prominent the one I have, and his balls were as fat and as full as mine swell to: almost bulging with his semen which would no doubt be just as copious and strong-smelling as my own.
What was truly riveting, though - even more than watching my son's hand sweeping so impatiently up and down his imposing hard-on - was the sight of his arsehole between his splayed legs. It was red and swollen and puckered prominently outwards through the dense wiry fur of his butt-crack. Jake liked to be fucked - he made no secret of that - and the conspicuous bloat of his anus made it obvious that he'd recently been on the receiving of a large number of young men's cocks just as big and thick and demanding as his own.
He saw my interest in watching him jerking off, no doubt following my eyes from his impressive erection down to his largy puffy ring protruding outwards from the forest between his cheeks. He grinned and licked his lips, enjoying throwing his dad a masturbatory show, and his arsehole opened wide of its own accord, gaping to the diameter of a modestly-sized penis.
I could see what he meant about feeling that something was 'missing' when he had sex which didn't include his backside. His bum kept clamping open and closed as if trying to squeeze the shaft of one of his friend's cocks and seeming frustrated that it remained empty.
"Come on, then, dad," he laughed over at me. "Join in with me - it'll be fun to wank off together!"
I hitched my trousers down to my knees and he chuckled at the size of his old man's hard-on straining inside his tight white briefs. The tip of it had made a large round damp patch and the darkening head of it could be seen through the translucent material.
"I don't know why we've never done this before," he said. "All the years we've lived together."
I smiled back at him, pulling my briefs down to join my trousers around my knees. "I don't think it's quite the done thing, Jake. It's not what one might call a typical father-and-son activity."
He chortled at that, still pumping his large cock. "Maybe not, but it should be. Have you ever wanked off with another dude? In a non-sexual sense, I mean?"
I laughed over at him, pulling my foreskin back from the ripened head of my cock and jerking it a few times along the thickened shaft. "How do you wank off with a guy in a non-sexual sense?"
"I mean, not as part of the two of you having sex. Just the two of you as friends, enjoying a wazz-off together."
I shook my head, gently massaging my cock in what was a pale imitation of my son's rapid and energetic foreskin-yanking technique. "No, I can't say I've done that. Have you?"
"Yeah, loads of times," he grinned. "With different mates at different times. At scout camp... during stopovers... anytime me and a mate were sharing a room. Sometimes just for the hell of it when we were bored."
"You and your friends have masturbated together?"
"Yeah," he nodded. "Not touching each other or anything - just having a wank in front of each other. It's nice... kind of intimate without being... you know... 'gay' or anything. There's nothing deep or meaningful about it... it's just... I dunno... a 'bro' thing maybe."
"It sounds nice," I agreed. "I can understand the appeal."
"A bit like this," he smiled. "Just the two of us doing something private and sexy together which doesn't mean anything more than what it is."
"Absolutely," I smiled back. "We go to the loo in front of each other... I suppose this isn't hugely different."
"Sit up like I am," he suggested. "Open your legs wide like mine so your balls hang low."
I did as he was asking, pushing my trousers and underwear down to my ankles. Now I knew it was no accident that he was letting me see his arsehole: he was sitting that way deliberately because he wanted to see mine.
I squatted upwards with my legs wide open and he peered into the hairiness of my crack underneath where my big, heavy balls were dangling between my thighs. I knew my hole would look just as large as his and I pushed my hips forwards to flaunt it for him, making it emerge from between my cheeks like a pink puckered hoop.
His mouth formed into a broad smirk and he tittered, "Bloody hell, dad! You can see you like a big dick up you! Your arsehole's massive!"
"Er... pots and kettles spring to mind, Jake! Yours is hardly a tight little balloon knot."
He laughed and groped under his knackers to feel at how large and round his own tush was.
"Oh yeah," he chortled, "it is pretty shameless really! I'm gonna end up with mudflaps if I'm not careful!"
He rubbed his finger around his flagrant swollen gape and asked, "Do you like it when a guy's arse is really loose and stretched open like mine is, or do you prefer it when he bends over and he's got a little tiny clenched freckle?"
"I can't say it's a big deal to me, Jake, but I suppose it puts less pressure on me to know that the bloke I'm with has had some experience of having another man... you know... mount him."
"For me, it's a case of the smaller the better," he grinned. "I like it when I'm rimming a dude's arse and his butthole's so clamped up I can't even get my tongue up it! And then when I'm fucking him, I love it when it's so small and tight it can squeeze my cock so hard the shaft comes out purple!"
I grinned and glanced at my over-sized shaft as I wanked it. "That's fine in theory, but I like to be sure that I'm going to be able to work this huge thing up the other fella's chuff! There's nothing as frustrating as having to give up because your buddy's back-end is way too narrow."
"I know what you're saying," he nodded, "but I prefer to take the risk! I like the lad I'm with to be a bit... you know... virginal, maybe. A big chubby cock out front, but a cute little crinkle round the back! I hate prizing a lad's arse cheeks apart and finding he's been such a total tart that he's got a train-wreck of a boycunt that looks like you could get a tree-trunk up it!"
I flinched at his use of the c-word before teasing him, "Talk about double standards, Jake! I mean, yours is hardly virginal!"
"I know," he grinned, fondling his own not unsubstantial boycunt again with an outstretched finger. "I've just overdone it a bit, but it'll soon shrink back."
"Overdone it a bit?"
He chuckled and threw me a naughty look with a rather delightful twinkle in his eye. "The night before I came home was... well... let's just say it was a good one!"
We kept masturbating and smiling at each other, my hand slowly picking up speed and pumping more and more of my length although his was clearly way out front on both counts.
He was right: it was nice to stimulate ourselves in front of each other. We were very close as father and son and perhaps it was natural for us to occasionally include self-gratification among the wide range of things we did together. It didn't feel particularly 'wrong' to see my son in front of me enjoying rubbing his erection and it didn't feel improper for me to be pleasuring my own with him looking on.
There was actually something rather cosy to know that we were sufficiently comfortable and confident around each other to be doing something so private together like this. I liked the sensation and hoped we could repeat it again.
"So how was your last night in Leeds a good one?" I asked him with my hand steadily sliding up and down my engorged shaft. "Come on, give me details!"
"There were five of us," he grinned, his own fist easily outpacing his father's rhythm. "We all did each other... took it in turns."
