Kyle wondered about what he could change, and who he could change. He wanted to change himself but who knows how any of this could affect anything. He could screw himself over, so it was best that he try with someone else. That's when he heard more giggling coming from his room. Ty and Brook were both in there, so maybe one of them would work as a guinea pig.
Kyle saw his opportunity and snuck up on his room. He found that the door wasn't actually fully closed, so that if Kyle wanted, he could lean into the room undetected. He wasn't about peeping so this normally wouldn't appeal to him, but with the device, Kyle could only think of fun swaps he could pull. He decided Brook would be the perfect subject. She was a cute Italian with curly black hair and nice tits, and he figured it'd be fun to see her in other lives.
Her and Ty were laughing away as Kyle decided to try a "gender" option on one of the minor swaps. He selected it, then selected Brook and himself. He hit swap and Kyle felt, odd. He looked down and saw two massive tits staring back at him. His hair was now golden and filled with luscious curls that passed his butt. His butt had also grown massively and he felt nothing in his crotch.
Despite this, he was still wearing his flannel and jeans, just fitted to his new body. He checked his Student ID and it read "Kyle. Male." Since it was a minor was, it only swapped parts of their aspects. The world still sees them as their genders, despite physically not being them.
Kyle peaked inside and saw Ty making out with a beefy, tall Italian man wearing Brook's underwear. Kyle tried not to laugh as he snuck away. One of the minor options also read "Social gender" so Kyle figured he had selected the physical variant. There was each of those options for every other choice as well.
Kyle then kept in and decided to with relationships with Brook. He selected himself, and then as he selected Brook, Ty moved in the way. Kyle hit swap and suddenly found himself in his room, being held by the male Brook! Kyle saw his new boobs were hanging out as he was only wearing boxers, while the man that was Brook removed "her" bra.
"Uh... Brook. Your'e my... girlfriend?" Kyle checked, highly confused.
Brook responded equally confused. "Uh yeah Kyle, obviously you're my hunk of a boyfriend! Now take me already!"
Kyle was astounded by what this thing could do. He then decided.....