"...I think I'll test it." You told her.
"Are you sure? It could be dangerous." she asked. She seemed really worried about you. "I don't want to lose my boyfriend in my birthday."
"And I don't want to lose you in your birthday." You replied before you gave her a kiss. "It won't be dangerous, I promise."
"Ok." She nodded. "And how do I use it?" You carefully explain all the functions to her and after 20 minutes she seemed ready. "Ok, I got it. Do you want to become something in particular?"
"It's your birthday. I'll let you decide. My body is your." You smiled at her. She smiled back before she pointed at you with the gun and hit your chest with a small laser beam. "What did you choice? Age? Gender? Racial? Size?"
"Hmm... let me think." she thought to herself. "I know, I choose..."