Your girlfriend gets a big grin on her face. "What are you thinking, babe?" you ask.
"Oh, I just want to try to make a wish for something to see if this works," she replies as your girlfriend closes her eyes, a look of concentration comes over her face and you start to see her chest tingling. You see her C-cup breasts start to grow bigger and perkier than before. The more they grow, the more her shirt's getting tighter and tighter. Finally, her boobs stop growing as they now about EE cups size. After she finishes and opens her eyes, your girlfriend looks down at her boobs and is happily excited to see her boobs are bigger than her regular boobs. "Oh, my goodness, it's working!" your girlfriend jumps with her excitement. "I always wanted to have bigger breasts."
"Wow, I can't believe you wish something like that, babe." You amaze your girlfriend.
"Well, I just want to try out to see if my wish comes true, hun," she replies. "Plus, with this pendant, I could wish for anything I want."
"Of course, babe. I give this present just for you. I'm glad you love it." You cuddle your girlfriend.
"Aww,... thank you for the best birthday gift, honey. You're my best boyfriend ever." She kisses you passionately as she appreciates and loves it. "Now, you wanna have some privacy for my birthday since nobody's here yet."
"Sure thing."
With that, you and your girlfriend go to her bedroom and both of you have a fun time together.