It felt odd for my son and me to be squatting naked together, his back rubbing against mine, but I was sure it must feel even stranger for his best mate Marcus who was lying out on our front room carpet, facing upwards at our two splayed bums and pressing the twinned heads of a double-ended dildo against each of our arseholes.
It wasn't the most typical Saturday night in the Furlong household but, then again, it wasn't especially surprising that we'd ended up in this position either.
My friend Guy - who was watching us with intent amusement - had spied in on my son and his friend from university the night before when they'd been enjoying a noisy bout of sex together. To his surprise, and to mine to after Guy had urged to me look in on them too, they'd been pleasuring themselves using a black length of rubber called a 'double-ender' - this being the dildo that was now poised at my butt.
I'd been immediately fascinated by the position they'd got themselves into and had been desperate to try it for myself. Guy had made it bluntly clear he didn't want a dildo up his butt - just as he stressed on a fairly regular basis that the only thing he was willing to have up there was my tongue. Obviously, I couldn't ask my son's friend if he'd be willing use the dildo with me: the two of them were regular fuck-buddies and, in any case, I'd only just met Marcus about four days before.
But I was determined to try out the incredible double-ended dildo and, since Guy and Marcus were out of the running, that only left one contender for the job.
I'd talked to my son that morning and had mooted the idea, very carefully of course, that I might like to try double-ending with him. He'd agreed that the suggestion wasn't actually that weird once we'd laid down some ground rules and it and had ended up being quite keen on trying it. We decided that as long as there was to be strictly no touching each other and that we'd use the dildo together in front of our two friends to keep the mood light and jokey, then there wasn't any real chance of it damaging the strong relationship we had as father and son.
So that's how we'd got to where we were now, the two of us naked and with our big floppy cocks dangling down towards the floor, pressing our bum-cheeks firmly together and trying not to giggle from being tickled by the wiry hair from each other's arse-cracks.
Our friends were both still fully clothed and eager to watch us perform, with Jake's university friend lying out underneath us and peering upwards as he levelled the two heads of the dildo against our buttholes.
"I always thought Jake had a big pair of balls, Mr Furlong, but yours are absolutely massive! They're... well... they're just awesome!"
I smiled over at Guy who looked highly amused.
"It can be quite a curse," I told him, thinking of how restricted I was in my choice of underwear.
"Yeah," Guy chortled. "He has to empty the bloody things about three times a day! If he doesn't keep nutting off, they get so big he can't fasten his trousers up."
Marcus chuckled. "All those times you went up to your bedroom, Mr Furlong, there I was thinking you just needed a bit of solitary me-time."
"Naah, he was bashing his beef," Guy asserted. "He's always at it!"
I didn't deny it, although usually I crept along to the computer in the spare room to help me attend to such matters. More importantly, though, I didn't blush either: I quite enjoyed the feeling that the four of us were all men together and could banter like this with amusement as friends.
Marcus pushed the twinned heads of the dildo firm against mine and Jake's bums. We both flinched and I felt the slick, shiny rubber slide smoothly deep up into me.
"Oh look! I got a hole in one, Mr Furlong!" Marcus triumphantly declared.
Guy laughed, "Yeah, that was always gonna be the easy bit!"
Jake gasped as the rubber eased more slowly through his tighter butt-hole and pushed its way into his less well-used tunnel.
He grunted, "Ah, yeah!" and pushed his bum down against it. I pushed mine down too but Marcus scolded my haste.
"Don't be greedy, Mr Furlong! You've already got about half of it in you."
I muttered, "Sorry, I hadn't realised," and he pulled a few inches of it back out of me to feed to Jake.
That's when the smell first kicked in: the smell of the first of the two Furlong arses, smeared down the dildo as it emerged from my bum.
It was strong and crude: the bitter and bracing smell that my sexual companions always tell me they greatly enjoy when they're using my back passage for us to have intercourse as two men.
Marcus sniffed the gathering odour curiously. He knew the smell already from watching Guy and me making love the previous night, but was also intimately acquainted with it from having my son's less robust version regularly waft up to him from his well-ploughed behind.
He said, "This is... er... going to be quite something once you the two of you get going!"
Jake sniffed the air too, no doubt recognising the paternal version of his own bum stink.
"Yeah!" he laughed. "This room's gonna reek to high heaven once that dildo starts getting all wet and slimy from both our butts!"
I noticed Marcus reach down to the crotch of jeans and roughly adjust himself. Either he was growing a hard-on which needed shifting to give it room or, more likely, had already been aroused by peering up at us from underneath and my bum odour had made his erection painful from where it was straining against his tight little boxers.
Guy laughed too and splayed himself out on the settee. "This is gonna be a fucking good show!"
I saw that he also had to adjust the front of his trousers - did the smell of male anal sex have the same effect on all men? - and I noticed his bulge was far more prominent than Marcus'.
Guy went on, "I think it's great that you pair are so totally comfortable with each other that you can do something like this without either of you getting all freak-out about it. You don't know how lucky you are to be so relaxed about stuff like this."
I beamed over at him and I think Jake smiled too.
He added, "I mean, imagine me and my lad Simon, squatting stark bollock naked together working a big black double-ender up our two hairy arses!"
Marcus gasped, "Fuck yeah!" and banged his head against the dildo he was still working up inside Jake.
"Sorry," he muttered, "but what do you mean? Does he have a mobile? Could you get him over here? Is his bum really that hairy?"
Guy chortled with laughter. "No, I just meant that he would never do something like that. He's way too uptight about sexual stuff, and even if he wasn't there's no way my arse is getting anything dick-shaped shoved up it."
