As his pajamas were tattered, Marcus had to sleep just in briefs which he felt a little tighter than usual. He didn't like to do that, however he fell asleep as quickly as he settled on the bed.
During his sleeping, his dreams were mixing between his usual children fantasies, videogame characters and baseball stars, to more weird and adult things, a very cute blonde girl who turned into a very curvy woman, she began to seduce him with her huge ass and he felt the need to get closer to her.
Back to the cabin, the magic spell on him was taking effect and he was unconsciously growing bigger. As he lay on his bed, his body seemed to stretch, arms and legs growing longer. His hands and feet became larger, looking out of proportion with the rest of him. His boyish cock began to stir, stiffening as it began to grow, his balls swelling.
In his dreams, he was touching the woman's butt as he get her same height, he can hear her softly moaning before she kissed him.
On his bed, the first strands of dark pubic hair began to sprout on the boy, a dusting of darker hair appearing on his arms and legs. His shoulders began to push out broadening as he got older, entering his teen years. The baby fat melted from his face and body, the planes of his face becoming more defined. Fine hairs began to grow on his lip and chin.
The little kiss quickly turned into a session of passionate kissing, he was touching everywhere his hands were capable of and she was doing the same with his widening back.
His body hair began to thicken as he body continued to stretch out, his pubes beginning to grow upwards towards his belly button. Muscle began to form on his scrawny form, slight pecs and a six pack becoming visible, giving him the look of a runner. His cock growing even larger, as his balls dropped a bit more and swelled.
At some point he had inserted his fat stiff dick in her clit while they're still kissing. He was going in and out of her with occasional moans by both. He was sweating musky drops that fell on her in the dream and were reeking his bed in the real world.
His jaw began to harden, becoming more squared as his facial stubble began to thicken and fill out. A bit of hair appeared around his nipples, spreading out until his chest was covered in a light dusting of fur. His body slowly stopped growing at around 6'2", his 8 inch erect cock pointing up straight from his pubes, his lean athletic body panting as his briefs can't handle his growth and finally they were torn exposing his erect manhood.
The woman in his dreams went to her knees next to the new man who looked to be in his mid twenties. She wrapped her hand around his fat cock, causing him to moan in pleasure. She leaned over, speaking softly to him as she stared into his eyes. "Do you like it big boy? I'll be back every night if you want it."
"Y-yes, please." The words came out in a deep voice that caused the once boy's eyes to widen in surprise. He lifted his head to look at himself, fearful eyes turning to the woman but she was gone and a white mare was staring at him now. "What's happening?!"
He suddenly woke up, panting and sweating. It's too early yet but some sunlights were illuminating the cabin. He grabbed his head with a hand and immediately smelled the musk coming from his hairy armpits. He shocked again, checking his bigger arms and chest, he removed his bed sheets and saw that his body had grew up bigger and hairier. His briefs were torn, so he could see the intimidating erection he was sporting. Strains of cum can be seen around it and, embarrassingly, he found them on the sheets too.
He quickly looked around and noted that his friends were still sleeping. He knew that he have to act quickly before they see him. So, he took some clothes from his bag and jumped out the window with his erection still on display.