"No, no, no!" You yell as you pick up the frog that was, and hopefully is, your girlfriend. "I wasn't lying. I just turned you into a frog, and I'm really sorry..." The frog ribbits, looking at you hopefully. You could still see the love in her eyes. She still wants you, but maybe in a different form.
You find yourself kissing her again, and you feel your body shifting. You become more blobby, and as you keep looking at your girlfriend, she looks more attractive by the second. Eventually, you find yourself at the same size as your lover.
"I still love you. Even if it's a curse, I want to stay with you, even if this curse is permanent." Your girlfriend kisses you, as you both find you have some human like features, kind of like Tiana and Naveen from The Princess And The Frog. "Now, where we we?" She turns around, exposing her new cloaca, causing your penis to grow once more.