Make a wish about Evie your Step-Sister.

You were about to make a wish about Megan, but then you thought of your step-sister, and that if you made a wish on her you would have a chance to see first hand how the wish worked out. Evie was 5'6", small A cup breast and a flat ass, and though you never really thought about her sexually before the thought of her growing excited you.

"I wish for Evie my step sister to have a 2nd puberty that is 100% stronger than normal puberty that never stops with no bad health side affects. She will enjoy growing bigger and enjoys showing off her larger body."

The Rock starts glowing red in your hand and slowly gets warmer. Then there was a loud snap and the stone cracked in half. Unsure if the wish worked you put the broken stone in your night stand and went to bed.