Jon hugged Karyn then looked deeply into her eyes.
"Karyn", he said. "Since we are now more mature and responsible, I... I think we should undo past responsibilities." His eyes drifted to her chest then away.
Karyn looked at him in shock. "You... You don't mean my chest and hair do you!"
Jon smiled. "I am now mature enough to say that your body doesn't matter. I love you for who you are, not what you look like."
"But you can't unwish wishes!" Karyn said.
"No, I can't. But I can modify them." Jon said.
Jon held the stone tightly and said "I wish my previous wish of karyn having blonde hair and big boobs has a time limit and it only lasted until we realized we were mature enough not to use it."
Karyn's tight shirt got more baggy in the front, her hair became shorter and brunette.
"I am still not sure this is the right thing." Karyn said.
Jon just hugged her tight and gently kissed her cheek.
"I love you so deeply, it... it's a shame we can't share the same dorm room." Jon said.
Karyn smiled at him and blushed. "But Jon, maybe we can." she said, "After all you have the stone, you could make us both able to share a dorm room."
"That could mean making us both the same gender", Jon said.
"We could make the wish have a time limit, or changable at will, or not change our gender at all. Even if it does change us we are mature and responsible enough now to give it limits so we can keep our old stuff and not change mentally." Karyn said.
Jon kissed her deeply and said, "Interesting, I'll think it over."