DISCLAIMER: I do not own any of the characters in the following story. They are from the movie Grown Ups/Grown Ups 2 and thus belong to the owners of the franchise.
This is a work of pure fiction and is centred around Greg and Keithie. It takes place in between the two movies, about a year before Grown Ups 2, when Keithie is twelve and Greg is sixteen. Keithie is beginning to go through puberty and seeks his brother out for help.
WARNING: This fanfiction will contain a level of smut between two family members. If this is not for you, don't continue to read. If it is, enjoy.
Greg's POV:
'Greg, come on', my little brother Keithie moaned, 'Are you going to answer the question or not?'
'Shut up, I'm trying to figure out how' I snapped back. 'Ok, I think this is probably the easiest way to explain.' My brother immediately stopped whining and sat up straight, gazing at me intently.
'When does it happen?' I asked him.
'What?' he replied.
'UGH,' I moaned, frustrated by his lack of common sense. 'Your dick, when does it go hard?'
'Ohhh. When I think about girls really, although sometimes it does it for no reason.'
'Right, and what do you do when it does?' I asked.
'Nothing really,' said Keithie, 'Just wait for it to go small again.'
'Ok, you need to let loose brother. Go and look up what jerking off is then try it in your own time. You can learn that part like I did, through research and practice.' I was now slightly irritated by his inquires and so suggested that we watch some telly together. He agreed so I unmuted it and we sat there peacefully watching the programme for a while.
After about 20 minutes, a fit women walked appeared on screen and Keithie started to squirm a little next to me, placing his hands over his crotch and blushing slightly.
'You haven't got a boner now have you,' I moaned in annoyance.
'If that means my dick's hard again then yes, I have,' announced Keithie. 'Its like I said, girls make me hard.'
I snorted. 'Me too mate, but obviously you're long overdue a wank.'
Completely ignoring me, he went on talking, 'Mum makes me hard sometimes you know. Don't you think she looks hot.'
I focused on the TV again, trying to zone out because I did find Mum quite attractive but didn't want to think about it becauseā¦
'Dude!' exclaimed Keithie, 'Now you've gone hard as well.'
'Crap.' I glowered at him. 'You did this, talking about mum. Now I need to go and jerk off.' I began to stand up, ready to go to my room and relieve myself.
'Wait,' said Keithie hesitantly, standing with me and removing his hands, revealing the bulge in his jeans. 'Could you maybe stay here and teach me how as you do it?'
I sighed and we both sat back down. 'The things I do for you Keithie.'
Eagerly, he bounced closer to me on the sofa. 'What do you do then?' he asked.
'Just copy me,' I said, 'It's not that difficult.'
I began to unbutton my jeans, hearing a zipping sound next to me as my brother did the same. Both of us pulled off our trousers and pants, leaving me in socks and Keithie stark naked. Being quite hard already, my cock was dragged down with my underwear and then rebounded, slapping me in the chest. A similar noise came from my left as the same thing happened to my brother. Intrigued by the volume of the noise I looked over at my brother.
'Bloody hell Keithie,' I exclaimed. What had looked like a small bulge was actually a rock hard 4-inch cock, leaking pre-cum like a small fountain.
Grinning, he said 'I know its kinda big, I have to hide it when I pee or get changed at school.'
'4 inches man, that's big for your age, I'm proud of you,' I stated, 'When I was your age my cock was about that size too, which promises great things for your future. You're probably gonna end up as big as me when you're my age.'
Spinning to face me, Keithie let out a gasp as he stared at my dick, now rock hard and leaking pre-cum just like his. 'How big is yours?'
'7.5 inches, still with some growing to do,' I replied, 'but don't worry Keithie, your dick will grow with you, and you'll be as big as me in no time.'
'I wasn't worried, just impressed,' he stated, 'Now are you gonna teach me to wank or what?'
'Alright Mr Impatient, I was just admiring the fact that we both have cocks to be proud of. Now do what I do.'
Whilst I was being partly serious with my brother, I also was dying for release and so I wrapped my right hand around the base of my cock and began to wank, glancing over at my brother to check he was doing the same. We wanked together for a few minutes, my brother glancing over at me every now and then to check he was doing it right. It wasn't long before he began to moan and, glancing over I saw him close his eyes and screw up his face.
'Dude, I think I should stop, my dick feels really weird' Keithie said, squirming around on the sofa.
'Don't worry, it's a normal thing, keep going and just relax, you're about to cum.'
'What's that mean?', said Keithie, just as he gasped and began to spasm.
'You're about to find out' I chuckled, 'Like I said, you need to let loose.'
I had barely finished speaking when my brother arched his back and shot four loads of cum onto his chest. Panting slightly, he relaxed and looked at me, still sat next to him tugging on my erection. Laughing at the contented look on his face, I slowed to a stop and addressed him, pointing at his chest as I spoke.
'That's cum. Also known as semen, spunk or jizz. Four shots on your first go isn't bad, but it looks like that's been building for a while.'
'Aren't you going to cum?' he asked, pointing at my slightly softened cock.
Laughing again, I took my dick back into my hand and began to jerk again, increasing pace, eager to finish what I had started. Barely two minutes later it was my turn to moan, as I shot 5 spurts up and onto my chest. Glancing at my brother, who had watched me with fascination, I smiled.
'Let's go and get cleaned up' I said, heading towards the kitchen for some tissue, 'Then we can carry on watching the TV.'
Keithie followed behind me, his cock softening but still grinning like a maniac.
'Now you know how to do it yourself, maybe you won't get hard all the time anymore', I smirked at him.'
'At least when I do, I can enjoy myself now,' he said, smirking back.
Accepting the tissue from me, he mopped the cum from his chest and then we headed back to the lounge, sat down and carried on watching the TV as if nothing had happened.
Thanks for reading, I hope you enjoyed. Don't worry, their weekend is just beginning. Chapter 3 as soon as I can :)
