It just feels right for your own son to stroke you off. The last thing daddy expected was to feel his son's curious hands around his girthy baby-maker, but at least this explains why the kid's always asking to get in the shower with him.
"Boy, you're 16 now. Surely you can take showers by yourself?" The father asked, trying to hide his excitement.
"So? What's it to you?" The son replied, with a cheeky smirk on his face.
Dad was going to reply, but once he felt his son's hand wrap around his veiny half-hard cock, he stopped.
"You're always chubbing up around me, dad. Got something to say?"
The father looked away, trying to hide his blush. He waved at his son, offering him permission.
"Just make it quick." He said, his voice low.
However, the second he felt his son's hand wrap around his cock, daddy tanuki here nearly fell to his fuckin' knees. This is the first time for the both of them.
All that's making them do it is the son's sky-high confidence to hit on his dad when and wheresoever he pleases, and the father's undeniable need to cum. The breadwinner hasn't cum in weeks. He doesn't even fuck his wife anymore, all he does is squeeze his cock to some videos on YiffHub. Yeah, sure, it started out with some tits and ass at first, but there's a reason daddy has been purging his search history more than he checks to do the dishes now. He's already knee-deep in exploring the gay side of YiffHub. Mid-life crisis, perhaps? Or is he that much of a breeder that he'd find anything with a pulse attractive; eager to stuff any and all hole with his fat hairy daddy dick.
But you and I both know the reason: his kid is growing up to be a real looker. Sure, he may have a big fucking mouth of him, but at least that has its uses. Like choking on the cock that made him. Whenever the kid gets bratty or starts to make sarcastic comments towards his mother, the father has to hold everything back so he won't go apeshit on his son's throat then and there.
("Damn sexy twink...") He thought.
A 'twink', huh? Daddy's already learning the lingo, is he? I don't think that's particularly surprising, given how horny he is every night, having no choice but to spout out and admit all his incestuous fantasies to strangers on the Internet all while his wife is sleeping next to him, with the father much preferring his 16-year-old son in bed with him right now.
"Already off in your own world, aren't you, Dad?" The soft tone of his son's voice called him back to reality. And what a glorious reality it is...
He looked down to find his son's face under his cock, the size of the thing reaching to his forehead, the lad's nose stuffed in his father's scruffy balls.
"You're too blown away from the fact that it's finally happening, aren't you?"
The father rolled his eyes.
Are all teenagers like this? Do they all think they're hot shit? Sure, I mean, most don't get to inhale their father's furry balls and tease him for being an incest-loving pervert, but still! The kid's got a mouth on him.

("A mouth...")
"Shut the fuck up and suck my cock."
The father said those words in one breath, heavy and low. Even his son seemed a little taken aback by his forwardness, but daddy certainly noticed the throb of his cock once the command reached his ears.
"Damn. Alright, bossy boots."
Like his pride was knocked down a peg, when the son wrapped his mouth around his father's tip, he was careful with it, like he didn't know what he was really doing.
But of course. All kids these days only know of the Internet. They don't have real life experience. See, they'll talk about sucking their dad off, but actually haven't ever sucked a dude off before.
Noticing his son's awkwardness, the father sought to allay his fears.
"I don't care how you do it, son. Just watch the teeth and make me blow."
The bluntness of his father is what made it most attractive for his son; it's almost as if this man cast all morals asides some few weeks ago, when he took one step too deep into the YiffHub gay category. I guess those comments about twinks needing daddies really got to him, because seeing his bratty, sexy-fucking son on his knees before him, looking up at him with a cute, shy blush, made him harder than you would ever believe.
Having to support himself up by his elbows, the father tried not to slip down the tiled wall as he got a blowjob from his teenage son that he'd remember until his dying day. 
"Holy shit, son. I had no idea your mouth was that soft..." he breathed out.
The son looked up to him and smiled at his compliment, happy to know he's doing well. But instead of popping off his cock to offer another uninvited retort, the kid stayed sucking on that cock like a good bitch would.
"Such a good boy..." The father smiled, half out of pleasure and half out of pure fucking relief that his son has finally shut up.
He gently patted the boy's head.
His son was seeing a side of his father he'd never thought he'd see - his vulnerable side, his sexual side, his pure perverted side.
He pushed his son down to the base of his cock, choosing to ignore his gurgles and squeaks around his cock, thinking of them as nothing more but a good-for-nothing twink cocksucker bitch being shown his place. (Daddy is really getting the hang of this lingo, isn't he...?)
The son's nose was now buried in his father's thick brown pube bush, which pretty much impaired his vision with dad fluff - his need for oxygen slowly being replaced with a need for his father's cock stink. Rather, his natural musk. As for what he'll drink from here on? His father's cum would do just fine. Thick, goopy and hella copious that it could easily overflow a pint of milk. Plus, his father's cock slop has all the nutrients he needs to grow up big and healthy.

"Darling! Dinner is soon!" His wife shouted from downstairs.
The father winced his eyes shut and attempted to stop a growl from escaping his throat as he answered her back.
"I'll be there soon!" He shouted.
He then looked down to his one-in-a-kind son, a sarcastic comment enthusiast and a venerable cocksucker all-in-one, his face covered in ropes of his father's spunk, yet here is, continuing to jerk off the 20cm cock that made him, draining the man so dry that he was sure to have the blood leave his head at any moment now from how good it was.
"Fucking hell, you've already been fed." The father said, out of disbelief. How can he not be proud of his son after that impressive milking? Seems he's got something going for him after all.