"...my mom."
"Your mom?" your girlfriend ask. You have always admired your mom as a young beautiful woman, and your loved all of her kindness. Since when you were a little boy, your old man(aka your dad) who was cheating on her with other women, so your mom have enough of this and getting a divorce and lives alone with you. However after getting a divorce, your mom thought that she could take care of you by herself, but you could always see how lonely your mom was, always working, always be a single mother, and the only time she smiled was when you two were together having fun. You always love your own mom and wanted to give so much back to her that you had started to dream about giving her the perfect life, and maybe something else. Maybe something a little dirty, kinky, and incest.
There wasn't much time to ponder this though as your girlfriends changes had begun. Since you were now the age of 18, your mom was about 39, almost 40, and your girlfriend's age seemed to be changing too. While she grew 4 inches taller than her 5'2" height, her hair was growing too. Her hair, 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. While this was going on, all her clothes seem to have vanished to allow her to keep growing in all areas. Next are her breasts, which increase from a nice C cup to a full, big EE cup, you didn't realize your mom was so big. Along with her chest, her skin seemed to darken a bit from a tan, and all excess hair on her arms and crotch dissappeared. 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.
Standing before you now was not your girlfriend anymore, but the almost perfect naked body of a beautiful woman you just happen to call mom. Your girlfriend finally looks over to you and says. "Oh my, that was a strange ride." She stopped for a moment and realized that her voice was different too. She walked over to the nearest mirror and checked out her new body a little before turning back to you and asking. "Okay, besides the fact that your mom looks great for her age, why did you choose this over anything or anyone else you want?"
"Well, as you can see." you begin,"You could say we all have our own dark fantasy or kinky that we might never get to try out. However, here we can try just about anything and nothing bad will come from it, because no matter who we change into, it's still just me and you."
"Hmm... I guess so." your girlfriend states as she begins to walk over to you. "But you know, I thought you were going to keep the kinky stuff for later. I guess you have suprised me once again, sweetie." your girlfriend finishes before she wraps her arms around you and kisses you deeply. The whole experience is sureal as not only are you kissing your mom's body, but your girlfriend had added your mom's nickname for you right before she did it.
There is no doubt left in your mind, this is going to be a vacation to remember.