"So... onto the first consummation," I suggested, pausing for the two men to reposition themselves and sit alongside each other on the couch. "In this painting, Adam is... er... making love to Stephen. Am I okay to describe it like that?"
I'd expected Adam to haughtily inform me that one man doesn't make love 'to' another but rather that their sex is collaborative and their love fully reciprocal. Or some variation on that general theme.
But instead Stephen giggled and surprised me by blurting out, "Oh come on... can't we just call it 'butt-fucking'? I mean, that's what we're going to do... fuck each other's butts."
"Sweetheart, we're talking about our wedding night!" Adam cooed. "It's our special joining... the fulfilment of our vows!"
"Yeah, I know... and it's going to be a really amazing experience for us both. But ultimately, you're going to fuck me up my arsehole and then I'm going to fuck you up yours. So why not just cut to the chase and call it what it is?"
I suppressed a chuckle. I was so pleased that Stephen had opened this can of worms rather than me.
"You make it sound crude," Adam argued. "It's a very beautiful moment... the connecting of our bodies."
"And it still will be! I'm just suggesting that when we're describing to Michael how we want him to paint the two stages of our consummation, it'll be quicker and clearer if we just say which of us is fucking the other up the bum!"
"It would indeed be rather less confusing," I chipped in. "Referring to it as your 'special joining' and 'anal union' is very poetic, but I would appreciate a little more clarity."
"Very well," Adam nodded. "In that case painting four is to show me fucking my new husband up his rather gorgeous butt."
Stephen chuckled. "So Michael... I don't know how much you know about gay anal sex...?"
"I certainly wouldn't claim to have an encyclopaedic knowledge," I admitted.
"Well, to get my bum used to Adam's cock, we have to start out looking kind of... well... inelegant, I guess you might say..."
"Inelegant?" I asked. Was this going to be something about shit again?
"Yeah... I need to loosen up... relax my muscles to receive him..."
"Oh, I see," I muttered, not really seeing at all.
"I have to squat really low and push my bum right back," Stephen explained, standing up and bending almost double so that his arsehole was yawning open like the mouth of a deep dark cavern. Adam stood up behind him with his big cock looming forwards towards the hole that his fiancé was so immodestly offering.
He went on, "Adam will enter me in this position until my backside is used to his length and girth. Then we'll get on the bed together and make love properly."
Adam nodded. "It takes about a minute and is fairly standard in same-sex coitus when the man penetrating is... well... as generously endowed as I am."
"I see." I wouldn't like having to go through a palaver like this every time I fancied a shag.
Stephen smiled up at me, still bending so low that his face was going purple. "I'm just telling you this because we really don't want you to paint us having sex like this. Some men like the position but for us it's purely functional."
I asked, "So how is this... er... 'pre-fuck'... if I can call it that... different from your love-making? How will I recognise the part you want me to depict in the painting?"
"The two things are completely different," Adam snapped. "Our actual consummation will express our love and our passion."
"Perhaps it would be clearer if you show me," I suggested, thinking they would get on the couch together and pose for me their more sensual way of making love.
But Adam interpreted my request differently and nodded, "Well, I suppose you might as well see it sooner rather than later."
He stepped forwards, grabbed Stephen firmly by the hips, and then to my amazement started pushing the head of his huge hard-on into his bent-over buddy's butt-hole.
"It resists a little at first," he told me, as matter-of-factly as he would if he was showing me how to screw a nut onto a bolt, "but once the fat tip of it's through, the shaft generally slides up nicely."
Stephen gasped, "Aw yeah..." as his arsehole stretched at full gape to receive his future groom's bloated helmet.
"This is why the rimming needs to be very thorough," Adam smiled at me as the ridged base of his mushroom slurped through Stephen's straining ring. "It not only excites us both, but it means one doesn't have to hunt around for a tube of lube."
Adam's long shaft performed as he'd indicated and slid more easily up into his fiancé's bowels now that the head was inside.
Stephen called out, "Oh Jesus!" and then let out a powerful fart.
Adam chuckled, "You should expect some very boisterous flatulence when two men are occupying the matrimonial suite!"
I managed to mutter, "I hadn't really thought -"
"With your navy background," he went on, still sliding his cock up Stephen's arse, "I'm sure you're not offended by a good, loud man-fart!"
"I just never heard one during sex..."
"Well you'll hear some absolute blasters on our wedding night!" he chortled. "It will signify to our guests in neighbouring rooms that the consummation is underway!"
"It's also one of the reasons for the 'pre-fuck', as you called it," Stephen panted breathlessly up to me as his butt let out another rip-roarer, struggling to accommodate the huge intrusion. "It gets the unpleasantness out of the way before we make love properly."
"Farting isn't unpleasant, honey!" his husband-to-be laughed. "It's a celebratory trumpeting to announce our love-making!"
"Adam likes a noisy blow-out when we enter each other!" Stephen grinned at me. "It makes discreet sex when we're staying over with friends just about impossible!"
"Okay, so I just hold him by the hips," Adam said, returning to showing me how he loosens Stephen's bum up, "and start sliding slowly in and out."
He withdrew a good six or seven inches of his cock from his companion's arse and I saw what he'd meant earlier when he'd referred to 'a certain amount of smearing'. He drove it slowly back in and Stephen let out another extremely loud fart.
"Bend lower, sweetheart," he muttered to his betrothed. "And open your legs wider... let me grind you a little..."
Stephen did as Adam instructed and contorted his body so that his entire anatomy was directed towards presenting his rear for his partner's cock to impale. Adam grabbed onto him more firmly and started driving himself with more force and vigour through the straining sphincter that was slowly growing used to his girth. He swivelled his hips to make sweeping corkscrews inside the tightly-stretched arsehole, causing a few final gassy outbursts as the rectum was readied for the full-on fuck.
"Are you sure you don't want me to paint you like this?" I asked. "The two of you look... well... quite extraordinary!"
"Absolutely not!" Adam asserted, now pumping his cock quite quickly in and out of Stephen's reddening arsehole. "I imagine this is how the men on your ship used to couple up...?"
"Well, sort of," I nodded. "Certainly one man was standing up holding the hips of the other who was bending over."
Stephen called up from where he was bent double, "It's the crudest way to have anal sex... it's how men do it in public toilets. We really don't want our friends to see us like this."
"But you look so incredible together! The way your whole body is focussed on receiving your lover's cock... your new husband towering over you... his buttocks flexing as he thrusts..."
Adam grinned at me. "You're welcome to make a few sketches of us warming up like this... perhaps compose a private painting for yourself... if that's something you'd enjoy..."
"You know... I think I would..."
"Can you paint one-handed?" he asked with a smirk.
I smiled back, by now willing to concede that I have been known to masturbate while painting my more interesting compositions. "All of my best pieces are painted one-handed."
"Maybe you could show me your technique during my solo sitting?"
"I paint alone," I told him, although I admit to feeling a certain amount of interest in painting Adam posed naked and masturbating, with my own smaller cock out through my fly receiving a vigorous tugging of its own.
Then Stephen called up, apparently oblivious that his fiancé was flirting with the artist, "If you do paint us like this, you can't show our faces, okay?"
I nodded. "Yes... of course."
"How's your bum doing, honey?" Adam asked his groom-to-be. "Feels like you're just about ready."
It occurred to me that if I needed to prepare my wife for sex like this, the two of us would probably have been celibate for years.
"Yeah... I think I'm good to go! Let's move across to the couch and show Michael how we want our fourth painting to look..."
To my surprise, the two of them stayed joined together and started lumbering across to the couch with Adam still holding Stephen by the hips. They tottered forwards like some ungainly four-legged creature, their two bodies awkwardly pivoted by the cock lodged fully up the arse in front of it.
"My God! Look at you both!" I cried out, my face in awe at the sight of this strange double-man.
"Yes, we're not at our most graceful when we're waddling around like this!" Adam laughed.
"You look... just so... I don't know! I've never seen anything like it!"