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 his Mum, Roxanne. This is the chapter where the story line will splinter away from the movie and the smut begins in proper.

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:

I groaned with pleasure as the head of my cock was enveloped in the warmth of Mum's snatch. I had wondered about sex for a number of years, as every teenage boy does, but not in my wildest dreams could I have imagined this. The way we fitted together, my chest against her breast, her legs intertwined around mine and the first 3 inches of my dick inside her, was like no other feeling in the world. The fear I had felt mere moments ago about losing my virginity was replaced by both an intense love for my mother and a desire for an orgasm.

I moved slowly backwards and forwards, knowing that if I went too fast too soon then it would all be over. Another thrust of my hips sent the next two inches of my rock-hard erection into the open mouth of her pussy, causing us both to groan. I closed my eyes in utter bliss and tried to concentrate on anything and everything that would delay my orgasm. As if sensing what was on my mind, I felt her hand come to rest on my cheek. Opening my eyes, I let her pull me down to her mouth for a soft and loving kiss.

'It's alright baby,' she whispered softly, looking me straight in the eye, 'You're not going to last long and that's fine. Let it go.'

Her words undid the last of my self-control and I collapsed onto her chest as the best orgasm I had ever had overtook me. Half a minute later, I opened my eyes and met my mum's gaze, smiling broadly.

'That was awesome,' I said, rolling off her, my cock emerging from her pussy, softening slightly.

'I'm glad you enjoyed it,' she said, smiling back at me.

She reached between her legs with one hand and, still smiling, scooped some of my cum out of her pussy and brought it up to her mouth before sucking it off her fingers like cream.

Swallowing, she looked me in the eyes and stated, 'You taste so much nicer than your father. You also cum a lot more than he does.'

She then reached back down between her legs and repeated the motion as before, this time deliberately making a noise as she sucked her fingers, and then gulping as she swallowed it. Seeing my mum putting on such a show for me was making my cock swell up again and I was back at full mast in a matter of seconds.

Roxanne's POV:

'Someone's ready to go again,' I said, 'I miss the stamina of youth. Once your father's done once he's out for the night.'

'When it comes to you Mum, I think I'm going to be hard all night long,' Greg replied.

'Well then, we'd better get on with it hadn't we. How about I ride you this time?'

Without waiting for Greg to answer me, I straddled his legs and carefully lined his cock up with my dripping wet pussy before slamming myself down on his huge piece of meat. I gasped as all eleven inches were shoved deep inside me, my ass slapping down onto his heavy, spunk-loaded balls. Greg groaned along with me and I felt his cock swell even more. Without a second thought, I placed my hands on his pecs and began to ride him, speeding up as I became more accustomed to his size. Less than a minute later, I was bouncing on him in earnest, my ass making a loud slapping noise as I landed on his hips again and again. Nine of his eleven inches were emerging from my cunt before I plunged them back into my warm depths. Greg's eyes were fixed on me but I could see the effort he was putting into not coming quickly again. Slowing to a stop, a began to simply gyrate my hips, leaning down to shove my tongue into my sons throat, to which he responded enthusiastically.

Within 30 seconds however, I was ready to go again, too horny to stop for long. I closed my eyes and resumed my frantic motions, desperate for an orgasm. Abandoning all attempts to control myself I began to moan loudly and Greg began to grunt and moan as well, bringing one of his hands up to play with my stiff nipple. Greg's panting became even louder, and he began raising his hips to meet my thrusts. I could feel his balls pulling up towards his body and, sensing he was about to spurt again, I began to play with my nipple, wanting to get off at least once during this experience.

All of a sudden Greg lifted his hips upwards and I felt his cock pulsing as he shot his second load of the night. Without warning, he sat up and removed his hand from my breast, only to replace it with his mouth. He bit down on my nipple and the corners of my vision blurred as I felt my twat spasm around his deflating meat-stick as a huge orgasm overtook my body. I collapsed on top of Greg, my tits colliding with his muscled chest, the only sound in the room that of my ragged breathing.

'Where did you learn to do that,' I gasped.

'Saw it in a porn video somewhere I think' Greg replied casually, before sweeping my hair back behind my ear and clamping his lips back onto mine and shoving his tongue back down my throat.

Greg's POV:

I loved kissing Mum. That was a fact I had come to realise quite early on this evening and I don't think I'd ever tire of doing it. Even though I'd already cum twice in relatively quick succession this evening, just kissing her and the feel of her nipples against my chest were making me hard again. Suddenly fuelled by a new bout of energy, I grabbed Mum by the waist and lifted her off my cock, my semen running down her leg. I threw her down onto the bed where she lay on her front, while I moved behind her. Realising what I wanted, Mum got up on her hands and knees and presented her perfect lips to me.

All reservations now dispelled I wasted no time, sheathing myself fully with one thrust, revelling in the moan that Mum let out in response to my action. Deciding to torture her slightly, I slowly pulled out until just the head of my dick was left inside of her before sliding back in just as slowly. I repeated the action and then, on the third time, I pulled out slowly before thrusting myself back up to the hilt, eliciting another whorish moan.

Evidently having decided that enough was enough, as I pulled out for the fourth time, Mum didn't even wait for me to start moving forward again, but instead shoved her hips backwards forcing my cock back into her sopping wet cunt. Deciding that I had kept this up for long enough, I grabbed her by the hips and began to quickly thrust in and out, my left-hand snaking down to play with her clit. As time went by, she began to meet each of my thrusts with her own, the room filling with the sound of sex as flesh hit flesh repeatedly. I flicked her clit once again and her arms gave way as she collapsed as another huge orgasm rocked her body. Another thing I had learnt tonight was that my Mum was a sexual machine, still capable of keeping pace with a horny teenage boy.

I felt the inevitability of another orgasm approaching as my balls began to tighten. I immediately stopped pummelling Mum's snatch and pulled out and began to jerk off, her juices providing the perfect lube. With my other hand, I rolled her over, her face coming into view, and he tits swaying at the sudden movement. Less than 20 seconds later I groaned and began to spurt for the third time that night. My cum burst out of my cock and shot straight onto Mum's tits. After spurting a few more times, her rack was covered in my jizz. I lay down next to her and turned my head to look her in the eye.

We both smiled at each other in postcoital bliss for a few minutes, as I became aware of the party still raging downstairs, before she sat up and said she was going for a shower.

'Don't want your dad to see me like this,' she said, 'That would take quite a lot of explaining.'

I snorted at the very thought of that conversation and helped her to collect her clothes. As I handed her back her bra and our hands intertwined, our eyes met and, once again, we kissed. Mum broke the kiss first, before smiling at me.

'Well done baby,' she whispered, kissing me again, 'You can be proud of yourself. I can't believe how much you've grown up.' As she said this, she glanced down at my cock again, before letting go of my hand and turning to leave. As she walked out the door, hips swaying, hair dishevelled and some cum still running down her leg she had never looked more sexy. Just before she disappeared from view, she looked around and winked at me, before closing the door and leaving me alone in my room.

As I heard the shower begin to run, I pulled my boxers back on and rolled into bed. Now drowsy, I began to drift off to sleep with only one thought in my mind; things had only just begun.

Thanks so much for reading. As always, reviews and any suggestions are welcome. Next chapter as soon as I can :)