Jake decided he was instead just going to go to sleep, leaving the smoothies all on the kitchen side. Going upstairs he went into his room and fell asleep. Later that same day his mum, Sandra came home with a load of shopping, dumping it all in the kitchen she laid her eyes upon the crate of muscle smoothies on the side, exhausted from her carry she decided it would be best to grab a drink as quick as possible, opting obviously for the smoothies left conveniently on the side.
Taking one out of the crate she began to slurp it down, finishing it in a mere few seconds she placed the empty cup back on the side and went in to the lounge, sitting on the sofa and putting on the tv, but then, a few seconds later she felt her stomach rumble, she crossed her arms over her stomach as she stood up and winced in pain, falling to the floor. Sandra was a rather average woman, age 42, long plain black hair, a rather large bust, not much of an ass to speak of and was still in relatively good shape, green eyes, etc, etc. She arched back as her breasts shot out in size, "OHHH!" She moaned, her tits continued to inflate massively, she arched back again as her ass blew out and her muscles roared with untold size, she quickly shot to 7ft tall as her body rumbled and shook, her muscles continued to expand rapidly, her frame going to beyond hulk sized, her shoulders and traps began to rise up behind her and swallow her head and neck, her tits blew out again making her moan, she reached 8ft tall and stopped, her pussy dripping, the smoothies had a much bigger effect on her. Jake came downstairs after hearing all the commotion to see his mum standing there massive and wet, with medicine ball sized tits rising and falling with her every breath, her face barely visible over her gigantic tits, her nipples harder and longer than ever. "MMMMMMM" She moaned, staring her son down as he came further into her view, trying to peer over her massive boobs, "M-Mum? Is it really you? What did this?" Jake asked, Sandra didnt move, she simply stayed still, panting from her imminent release of fluids, her body began to rumble again and she fell to her knees, crying out with pleasure as her pussy blew, her clit grew and grew into the size of a pink fleshy and throbbing tennis ball that writhed with her every movement, "YEEEEEEEESSSSSSSSS!!" She hissed as she shot up another foot, muscle and endowment growth followed.
Jake ran into the kitchen, eager to outdo his still growing mother he grabbed another smoothie and gulped it as fast as he could, then he took another and did the same again, this time his growth started instantly, he couldnt hold it back, he moaned as his erection tore through his clothes, his muscles ripping through it like wet paper, his pecs surged out, he grew to 10ft tall in an instant, his erection pressed against the wall of the kitchen, he roared in ecstasy as his erection pushed through the wall, punching through it sending an orgasm wracking through his frame, surging him up another foot, his cock shot cum across the lounge, smashing through the glass doors leading outside, his mother staring at the massive thick and throbbing cock growing through the wall, Jake roaring in pleasure over and over, Sandra moaned as she approached this huge growing member and tugged at it, causing Jake to writhe more and more, pushing his legs through the wall the also, his mother merely laughed as she jerked his member harder, "SO WEAK.. YOU ALWAYS DID GIVE IN SO EASILY!" She hissed, leaving him writhing in pleasure as she went back into the kitchen, forcing her body inside and creating a large gap as wide as her, she grabbed another 2 smoothies and prepared herself for what was coming next.