For the last five weeks my Dad has been staying at my flat, ever since he had a serious row with my Mum, which resulted in him moving out. They married when they were both 21 and I came along a year later, which means they've been together over 26 years, so I'm not sure what's gone wrong.
He'd no immediate place to go, so I offered to let him stay with me, thinking that whatever it was would blow over and he'd be back home in a week.
That hasn't happened and neither he nor my Mum will tell me what its about.
It's not a disaster having my Dad here and we're getting on well enough, even if things are a bit cramped.
He's sleeping on the sofa bed in my small bedroom that I occasionally use as an office, surrounded by all his stuff in boxes on the floor, which can't be that comfortable but he's not complaining.
It was a bit awkward at first but now we've settled into a routine which works for both of us.
He's a handsome man my Dad and it's where I get my dark Latin looks from. He dresses well and keeps himself fit, with hardly any belly to speak of. I hope I look like he does when I'm in my forties as well.
I've also noticed a few things about my Dad that I never picked up on when I lived at home.
He's very tidy and my flat has never looked neater.
He's also a pretty good cook and because he finishes work earlier than me, most nights I come home to a cooked meal, which is a change from my usual diet.
The other thing I noticed was when he was standing in the bathroom shaving, with the door open, that my Dad has a great arse.
He was standing there with his back to me, with only his briefs on and I found myself looking at how the white cotton was stretched by his round firm cheeks.
In fact his whole body was in good condition for a man in his late forties, but his arse was the thing that stood out.
I looked up to find him watching me in the mirror.
"Sorry Charlie, I always forget to close the door. Your mother is forever giving me grief for it."
"No problem, Dad. It's only you and me."
I walked away but I was slightly embarrassed that he'd caught me staring at his arse.
Not that he has a problem with me being gay or anything, it just felt wrong somehow.
Over the next week I got a few more glimpses of that arse as I passed the bathroom in the morning, always encased in white briefs, as he completed his shave.
I began to wonder why I'd never noticed it before and why I was looking at it all all. He was my Dad for pity's sake. Still it was a very tempting arse and he probably didn't even realise it.
There was one problem with my Dad living with me however and that was that I was a bit reticent about bringing guys back, so if I struck lucky on a Friday night, I opted to go to their place. I never stayed over though, but always made my way home.
This Friday was different. I'd been chatting up the barman in the club for a while and tonight looked like it was going to turn into something.
Calum was small, dark haired and sexy, especially in his tight black trousers that clung to his bum, so when he suggested I wait till he finished up, I was really keen.
Unfortunately he lived at home with his parents, but I wasn't going to pass up the chance of fucking his cute behind, so brought him home.
Before we went in, I explained about sharing with my Dad, so we'd have to be quiet.
As soon as we entered my bedroom, he was all over me, unbuttoning my shirt and kissing my neck at the same time, before moving on to my zipper and getting his hand inside my jeans to fondle my cock. This guy was really keen.
Using my foot, I gave the door a shove. It didn't quite close, but I was in no mood to stop.
Soon we were both naked and I had him lying face down on the bed, while I straddled him, kneading his cute little arse before spreading his cheeks to expose his rosy pink hole.
I bent down and touched his pucker with the tip of my tongue, which made him groan, then proceeded to lick and probe him, till he was begging for my cock.
Slowly I pushed my thick 8 ins rod against his moist hole, stretching him open, nudging inside him inch by inch till we were skin to skin and his arse muscles took a grip of my shaft.
As I began to thrust inside him, he buried his head in the pillow to muffle the noise he was making, which I was grateful for, with my Dad through the wall.
Then as I carried on fucking, a strange thought entered my head, as I imagined that it was my Dad's muscled arse I was fucking.
I shook the image away and concentrated on the sexy young guy underneath me, who was obviously enjoying what I was doing by the noises coming from the pillow.
I slammed into his hole, my body slapping against his arse cheeks, my cock penetrating deep inside him as I increased the speed of my thrusts.
Somewhere behind me I was aware of a slight creaking noise and I hesitated just for a minute, but everything was quiet.
I got back to fucking Calum, my hips moving in a steady rhythm as I ploughed his arse.
Any minute now I was going to blow and Calum started whispering to me.
"Come on Charlie, fill my arse. I want to feel your cum inside me."
One final thrust sent a huge stream of cum shooting up Calum's back passage and he let out a sigh, while I collapsed on top of him.
We lay like that, contented, till I crawled off him and sat up ready to go clean up.
That's when I noticed the door was more open than I remembered and my first thought was hoping that Dad hadn't been up to the toilet or anything. Was that the creaking noise I'd heard?
Having my Dad see me fuck a guy was not something I wanted to happen and probably not a thing he would want to see either.
Half an hour later, I let Calum out and went back to bed.
In the morning I was lying awake, grateful for the fact it was Saturday and I didn't have to get up, when I heard a noise coming through the wall from Dad's room, a steady creaking noise.
It took me a while to realise what I was hearing, until it dawned on me that it was the springs of the sofa bed and my Dad was having an early morning wank.
I lay there listening as the rhythm of the creaking springs got faster and faster, then stopped and I swear I could hear a big sigh through the wall.
A couple of minutes later, he got up and went to the bathroom, then I heard the shower running.
I stayed where I was till he went through to the kitchen, then got on with my own shower and shave.
When I came into the kitchen Dad was sitting at the table drinking coffee.
"Morning Charlie, you sleep okay?"
"Good thanks, you?"
"Like a baby, Charlie."
"You weren't up in the night by any chance? I thought I heard you."
I was looking for signs of guilt, but he just shook his head.
"No, slept right through."
I wasn't totally convinced, but he seemed quite chipper this morning, no doubt down to jerking off before he got up.