"What's happening to me!," Brett exclaimed.
I inhaled air through his nose, and as he did, he became more relaxed.
"What is that smell?," he asked, sniffing around.
He looked over at his brother... I mean... his sister's pussy.
"It smells delicious," Brett said, unaware of the brown fur growing on his body.
He quickly started to rip off his clothes and rub his new dog sheath to full length.
"Look at that," he said, "I'm even bigger than I was before."
Brett glanced at his sister and grinned.
"Brett?," Alexia asked, "What are you doing?"
But she was denied an answer as Brett jumped on top of her and began to lick her pussy, causing her to moan.
"God, Brett!," Alexia yelled through tears, "Please stop it!"
But Brett ignored the pleas of his sister as he began to kiss her on the lips as his feet became covered in brown fur and turned into paws.
A tail grew in and was instantly covered in brown fur.
He then readied his sheath to enter his sister's pussy, which caused Alexia to panic.
"No! Brett, please don't do this!," she yelled, "I'm your brother!"
But Brett's mind had become clouded with the lust as he shoved his dick into Alexia's pussy, causing her to moan in pain.
"AAUUUGGHH!," she yelled as her brother began to fuck her, "Please Brett! Stop!"
Brett was in heaven as the fur began to spread up his chest and neck.
His hands reshaped into paws and his hair turned to fur.
The faster he thrust, the more fur grew.
The fur that was on the rest of his body replaced his hair and his ears became brown and pointy as they moved to the top of his head.
A muzzle grew out where his face was as his tongue grew out and became more dog-like.
Brett's mind became cloudy as his memories of being a human were erased and replaced with false one.
He gained new instincts, mainly the one that told him to fuck everyone he saw.
Where there was once a human teenager was now a fully grown and extremely horny German Shepherd.
Alexia, who was crying from the experience, began to moan in pleasure, as her body was beginning to enjoy this.
"No!," she exclaimed, trying to fight the feelings she was feeling, "I am a boy, not a girl!"
But as much as he thought that, he couldn't help but feel like he was a girl now.
Soon, he gave into the fact that he was a girl, but that didn't stop him from freaking out when he felt Brett begin to thrust harder.
He was approaching his orgasm, and he was going to cum in her.
"No! Brett!," she yelled, "Nooooooooo!"
She was forced into an immense amount of pleasure as Brett cummed inside of her, impregnating her.
Alexia's mind was filled with new instincts as her memories were erased.
Now, there were two German Shepherds where there were once two human boys.