After a few minutes, Amy came back wearing a pretty cocktail dress that his mother hadn't used for a while, but in her it looks beautiful. Johnny was agape and was growing some weird feelings towards his step sister. He didn't notice it but he was also getting his first boner as he stared at Amy's newly grown breasts. "What do you think? I feel pretty!" Amy asked him and he can't believe how sexy she sounded. He wasn't able to say a word and he just blushed a little in shame.
Amy just smiled and started looking at herself through the full length mirror in their room. As she explores her body and touches every curve on her, Johnny's boner was growing more and more until it was so tight that he noticed. He had recently learned about puberty at school but he didn't know what to do with his hardon. He quickly ran to his bed where he took a pillow to cover himself. Amy noticed through the mirror but she just smiled, she knew a little bit more about puberty and she knew why he was acting like that.
"Hey, why don't you try it too?" Amy said in a kinda seductive way that shivered Johnny's spine for an instant. "I bet you'll look so handsome like a movie star." She took the Chronivac and set it in order to make Jonny grow. "I'm 24 years old right now. Do you want to be the same age or maybe you can be older?" Amy asked but her brother didn't reply, so she decided for him. While she was setting it, she noticed some additional features and she smiled, she can do more than just aging him...