"Well, I wish you look like my own mom." you answer.
"Huh? Your OWN mom?" your girlfriend asks as she's confused. Come to think of it, you have always admired your mom as a young beautiful woman, and you always have some wet dream about her. However, you couldn't do it right in front of your own mother 'cause that would be so much trouble. But now your mom joins your dad to their honeymoon, you now have an opportunity that your girlfriend to become your own mom to have sex with, maybe something a little kinky and incest if that's okay. There wasn't much time to ponder this though as your girlfriends changes had begun. Since you both are the same age of 18, your mom was about 39, almost 40, and your girlfriend seems to be aging as well. "Honey, I feel weird..." your girlfriend responds while she grew 4 inches taller than her 5'2" height, and all of her clothes are now vanishing to reveal her naked body. "AAhhh... I'm naked." she says as her hair starts to grow which was shoulder length and light blonde, was now growing a quarter way down her back, turning a deep brown, and appeared to be getting wavy. Next are her breasts, which increases a bit from E cups to EE cups. Along with her chest, her skin seemed to darken a bit from a tan, and all excess hair on her crotch are shaved. Her whole body had become more toned, as your mom worked out a little more than your girlfriend had. Finally, her face and voice both seem to contort and reform back to that of your mother's image. When the transformation was complete, the woman who is standing before you now was no longer your girlfriend anymore, but the perfect naked body of a beautiful woman you just happen to call mom. And then, you saw that her new clothes are appear in your girlfriend in your mom's body, a yellow blouse, a long brown skirt, a pantyhose, and a pink apron. And now, she's now look exactly like your mom. "Oh my god, I feel weird, honey." your transformed girlfriend responds as her voice sounds like your mom too, but not acting like your mom. Then, your girlfriend comes to the mirror to look at herself and examines the body of your mom. "Oh my god, I really am YOUR mom, honey. Wow, check at her breasts, they're so bigger than mine. And her face is so beautiful." she impress that she still acts like your girlfriend. Of course, you only wish your girlfriend 'look like' your mom, not 'to be' your mom, so that why you have to be careful what you have wished for, you just glad when you did that. "Geez, honey. I can't believe you that you turn me into your mom. Are you have some dirty mind of her?" your girlfriend asks with her smiles on her face.
"Well, you could say that, babe. And y'know I was wondering if I could try some dark fantasies, and incest of mine, so..."
"So you turn me into your mom just so you have sex?" your girlfriend says as you nod. "Well, I can't blame you, honey. Your mom looks so great at her age that you fantasize her as your wet dream MILF."
As she walks toward you, your girlfriend starts to hold you and asks. "So honey. Care for a little incest?"