A/n: This is the final part of Book 1 people; I hope you look forward to book 2!
"So, how do you suppose we turn me back?" Harry asked as he sat on the forest, flattening almost the entirety of it.
His penis was still erect and his ball were twice the size of Hogwarts, but Harry chose to ignore that fact and instead talk to Hermione, who was now sat in his ear canal where she could properly speak to him.
She still had to use the Sonorus spell for Harry to even hear what she was saying, but at least she didn't have to yell at the top of her lungs every time she wanted him to hear her.
"I'm not sure, the increased size of the potion managed to stop your growth, so it should only be a matter of time before you begin to shrink." Hermione answered, sitting in his ear canal.
"I think you should go back to the dorms then." Harry prompted. "Nothing would harm me when I'm turning back 'cause of my size, so I think I'll take a nap to pass the time."
"If you say so Harry." Hermione nodded, not that Harry knew though.
Before long Hermione had long left and taken an unconscious and shrunken Draco along with Ron back to the castle while Harry laid down, careful not to flatten the rest of the forest (an extremely strenuous and difficult task for his immense size) in the process as his eyes closed and he began to sleep.
As he slept though, his body did not want to lose its current power, specifically the penis, so his arms unconsciously began to inch themselves closer and closer until his hands subconsciously wrapped around his penis once more and began to rub up and down, up and down.
As time grew on, these motions became fast and harder, his hands caressing his balls and stroking his cock until Harry's body twitched and spasmed as he experienced his very first time cumming and orgasming.
Thick white liquid began to pray out from his penis like a waterfall and shot out for miles, luckily not towards the castle, but anything for miles ahead of him was drowned in cum and semen as Harry lowly moaned in pleasure along the way.
It was certainly extreme for a first time, and just before he started to shrink too, what a coincidence.
When Harry awoke, he yawned as his arms stretched and his eyes opened, sitting himself up to find himself shrunken.
He was still 14ft 9inches tall, but it was a vast improvement.
Standing himself up, he found himself near the same place where he, Hermione and Ron had first met up to see these growing and shrinking spells that caused this mess.
And sat right in the middle of it all was the book, the book that started it all.
Harry's first instinct was to go over to the book and rip it to pieces, but after a moment's thought he decided otherwise.
Reaching over and grabbing the book, he groaned slightly as he began to slowly shrink again as he held the book in his hands.
'There might be more to this book than we thought.' Harry thought. 'What else does it hold?'
It was more curiosity than anything and that was the only excuse Harry was giving himself not to destroy the book, wanting to find more in the pages that caused the whole scenario.
Either way it only took a couple minutes for him to be back to his regular small size of 143cm tall frame. He noticed that his penis was much bigger than before this whole mess started, but he was sure there was nothing to it, it'll wear off eventually.
He found his enlarged invisibility cloak (which he promptly shrunk) and, with the book in his hand around his naked form, he made his way back to the Gryffindor dorms to get some clothes.
As Harry finally made it back to his dorm room, he quickly pulled some clothes over his body as he looked to the sleeping form of his dormmates.
Still looking around for any sign of being watched, Harry placed the cloak over him, casting a constant Lumos spell over the book he held in his hand as it turned to a random page.
"Strength, huh?" Harry mumbled. "That could certainly help."
Draco cursed as he trudged about in his room at the Slytherin dormitory.
His plan for power was thwarted and they managed to snap Potter out of that little Confundus Charm he had cast. It took a long time to learn how to do it wordlessly and wandlessly, his father commending him greatly when he succeeded (no doubt because now he could make an argument or arrangement go his way much easier) and he'd used in on Potter when they were growing.
He wanted to convince Harry that the strong should rule over the weak, and they could be invincible. He knew that Harry wouldn't agree with him purely due to his morals, but with a Confundus charm he'd been able to meddle with his mind enough to agree with him.
It then led into a spiral where Harry's growth kept the spell active so that mindset of his stayed, just the way he wanted and when Harry shot up in size, he was in awe.
It wasn't until Weasley had knocked him out that things started to go downhill.
When he'd woken up, he'd found himself back to his normal size with Ron and the Granger girl looking towards the growing Harry.
If he couldn't be the big one, let Harry be instead, he thought in his mind.
He was disoriented, his vision was blurry, but he'd managed to cast the Speedormus spell three times on Harry as he fell unconscious to the roar of pleasure that erupted from Harry.
When he next woke up, he found himself hidden in a bush by the castle grounds, no doubt the Weasley's doing. Using his quick thinking and his wand still on him for some reason, he cast a quick Disillusionment charm that allowed him to travel unnoticed the Slytherin dorms and to his room.
Draco needed to think of a plan. If he could Confund the trio and bide his time to grow beyond what they could handle, then he'd be in the clear. No-one would be able to stop him, not the Granger girl nor her boyfriend or Potter.
All he needed to do was bide his time.
A/n: How'd you like the final of Book 1? Book two begins with part 9, so I hope you continue to read on if you enjoy.