I took the bottle off the shelf and examined it then flipped the lib open and took a sniff. I'd expected it to smell rubbery, like condoms, but it was totally odourless. Intrigued to see what it looked like, I squeezed a dollop of it out onto the palm of my hand. It was silky smooth, like water but thicker, and I loved how nice it felt working it between my finger and thumb.

I wondered whether both of Jake and his dad would use this from time to time and if they kept it in the bathroom for both of them to dip into. Maybe, like me, their choppers sometimes got a little dry when they were hard and horny, so they'd trot to the cupboard for a sly squirt to help get a wank get underway.

How great it was that the two of them were so cool about sex stuff that they could actually have a shared bottle of lube in the bathroom!

I smiled to myself, imagining Uncle Rob saying to Jake with that stuck-up way of speaking he has, "I've popped a bottle of Durex lubricant in the cupboard just in case, like me, you sometimes suffer from masturbatory dryness."

And Jake, setting out to shock his old man, quipping back, "That's ace dad... it'll be good for getting a dick up a butt next time I bring one of my uni buddies home."

All this wan't helping my present situation any. I had a raging hard-on making a long, thick rod lift the front of my lime green boxers and my helmet was so dry it was chaffing painfully against the tight material. I really needed to wank off - if nothing else it might help me sleep - and was busting to smear some of this soothing gel around the head of my cock and use its smooth slickness to slide my fingers up and down the shaft.

"Okay," I thought, "the guys are both asleep... I just gotta do this!"

I grabbed a length of toilet paper, switched out the bathroom light and then headed back towards my room with the bottle of lube in my hand. I was sure they wouldn't mind me borrowing it and I'd pop it back in the cupboard when I got up next morning.

As I approached Jake's room I slowed up so I could peek in through his door again. He was still humping the bed, making long, deep thrusts by raising his hips up from the bed and then slamming them down hard against the matress. He'd clench his bum as he ground his erection against his bedsheets, gyrating them around a bit to maximise his pleasure.

As he worked himself against his bed, lifting his arse right up and then pounding his hips back down, I could hear a low steady grunting accompanying each thrust. As I listened more carefully, though, I realised that the grunting sounds weren't coming from Jake's room but were drifting down the corridor from the other end of the hall. They could only be coming from Uncle Rob's room as he was the only other person in the house.

I crept silently along the hallway towards Uncle Rob's room and saw that his door was open too and there was a dim light spreading across the carpet from the crack.

The grunting noises were definitely coming from inside his bedroom. The closer I got to his door, the louder and more rapid they were getting.

"He's awake," I thought. "Is he doing what it sounds like he's doing?"

As his door was only half open, I had to peer around it to see what was going on. There was his bedside table... his lamp... his alarm clock...

I peered further around and saw his bed with the doona all skewy, then stopped and pulled back so my face was out of the light when his body finally came into view.

I could make out that his upper half was covered by a white vest but his legs were naked. In between his covered chest and bare legs, his dick - huge, hard and pointing upwards to the ceiling - was getting a thorough going over from his hand.

I was transfixed by the sight. I'd barely seen my own dad naked, never mind with a hard-on, and I'd certainly never seen a real-life adult cock being wanked off right in front of me. Uncle Rob might have been twenty-odd years older than me, but I have to admit his cock looked amazing. I stared at his hand sliding up and down his thick, veiny shaft, loving how the plump purple head at the top of it seemed to have been polished to a luscious shine.

Uncle Rob's balls were massive too and his legs were parted slightly so I could see them hang down and slowly tighten as his fingers worked his cock.

"How good is this?" I thought to myself as I watched and, without realising it, began to run my hand back and forth along the length of my own pumped-up stalk.

He steadied his hand for a few seconds and let it throb against his palm. A trickle of clear, thick liquid trickled out of his gaping slit before he resumed his stroking, letting his foreskin roll over the tip and sweep his precum across the whole fat purple head.

He raised his legs up slightly and bent them at the knees, spreading them wide apart so I could see up between his thighs. His arsehole was there, sitting snug between his two bum-cheeks, poking outwards and looking surprisingly large and swollen. I stared at it as he continued wanking his big dick off, watching it twitch and pucker in time with the rhythm of his hand.

The thing was massive and I couldn't understand what might have made it so big. There were two fattened lips on either side of his deep-looking hole and it reminded me of some of the well-fucked pussies I'd seen in porn movies and nothing like what dudes' arseholes are normally like.

Suddenly something, perhaps a tiny noise I made, caused Uncle Rob to raise his head up and he peered straight across at me, watching him from the doorway.

"Oh bloody fucking shit!" I thought. "He's gonna go ape on me!"

I imagined him shouting across at me, waking Jake from his matress-fucking slumber, accusing me of spying on him during what was a deeply private moment and telling me to get the fuck out of his house.

But he didn't so much as look even slightly annoyed. He just smiled warmly at me and asked me to come in properly if I was curious to see him.

"You sure?" I asked, pushing the door open fully. "I just... you know... couldn't sleep and heard a noise when I went to the bathroom..."

"I know how hung-up your dad is about nudity and masturbation, so I think your interest in seeing me enjoying my body is perfectly natural... to be expected, even..."

I smiled and went into his bedroom.

"Come and sit next to me on the bed," he invited me. "I'll show you some of things I've discovered about my penis over the years... maybe some of them will prove useful to my nephew too!"

Then he saw the lube I was carrying and the erection pushing the front of my shorts outward, and asked, "Were you about to... er... have some fun on your own?"

"Kind of, yeah," I laughed. "I just sorta squizzed this in the bathroom cupboard and I thought it'd be fun to try it out."

He chuckled at that. "Well, feel free to join in with me if you'd like to, Shane. There isn't anything to be embarrassed about in two men masturbating together."

"Yeah," I agreed. "Me and Jake did it the other night and that was fun."

"Exactly," he smiled. "Jake and I have had our moments too."

That made me raise my eyebrows in surprise. "For real?"

"Yes," he nodded. "Only in the last couple of years... I think it's rather beautiful, although he'd probably make fun of me describing it as such."

I sat down next to him on his double bed and he started wanking again. Part of me wanted to join in with him but another part - the old Brissy part - held me back.

"The part at the top of your cock, your glans, is what gives you pleasure," he told me, gently working his foreskin up and down across it. "Focus your movements on that, using your thumb to stimulate the little ridge at the base of it and your fingers to rub the two lobes at the back of it."

He showed me what he meant and his whole big phallus swelled to its full incredible size in appreciation.

He smiled and me and I smiled back at him and then he told me some more tips of how to maximise my pleasure.

The way Uncle Rob stroked his manhood looked so 'adult' and mature compared to the way I would do it. His pace was measured and the movements of his fingers, thumb and palm deliberate. He really knew how to work himself to get the most out of every millimetre of his cock.

I was still wanking the way I did when I first discovered it about six years earlier, flogging my dick like crazy for a few frantic minutes until it was sperm time. What I was seeing here showed me how much I needed to learn to enjoy myself properly by caressing my cock more slowly and carefully.

"Have you heard of anal masturbation?" he asked me as I was arguing with myself about whether or not I should join in with the full massage he was giving his dick.

"No," I shrugged. "Is it a gay thing?"

He laughed at that. "It's not gay to enjoy stimulating your bum, Shane. It's something I discovered a few years and which now gives me an enormous amount of pleasure."

He took his hand off his cock and reached across to the drawer of his bedside table. He pulled out a bullet-shaped rod of plastic that was cream-coloured and about six inches long.

He smiled, "Since you've brought the lube along it makes sense to put it to use."

I passed him the lube and he squirted some onto the rod before smearing it right around the full length and circumference.

"I use this to masturbate myself anally," he informed me, "but you can use your finger as a starting point if you're curious to try."

"Are you gonna push that thing up your butt?" I asked. I was wondering if that's what had caused the thing to look so big and puffy.

"That's right," he nodded. "The pleasure receptors that it stimulates work hand-in-hand with those inside the head of the penis. In other words, you masturbate your cock at the same time that you work something in and out of your bum."

"You can't spooge off just by wanking off your arse, then?" I asked.

"Actually you can, but you have to be extremely aroused.