While you watch your girlfriend's transformation, you see she grew 3 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 black, and appeared to be forming into a headbun. Next were her breasts and booty, which increase from a nice B cup to a full, big F cup, you didn't realize how big they were. Along with her chest, her skin seemed to more lighter a bit, and all excess hair on crotch dissappeared. Her whole body had become more toned, you start to wonder about this woman (who your girlfriend transforms into) seem to working out a lot. Finally, her face and voice both seem to contort and reform into a woman who so mature and so familiar to you, plus there is a mole on her face.
When her transformation was finally complete, the person who laying on top of you now was not your girlfriend anymore, but you realize she is now exact copy of a 40's year old woman you who turn out to be your headmistress(aka the principal at your school). Your girlfriend finally looks down at you and says,"Wow, that was a strange ride, isn't it?" You stopped for a moment and realized that her voice was actually sound like the headmistress too.
"OMG, you're turning into my mom!?" you shouted in surprisingly voice and step back as you frighten.
"Well, yeah... is it really matter?" your transformed girlfriend asked in her different attitude, it seems like she also change herself mentally.
"Of course not, but this is getting too awkward for me and really... really freak me out." you said awkwardly and stress out.
Then your girlfriend turning your face to look at her gently and said to you: "Relax, hun. I'm not the principal, it's just me in the exact image of her and there is nothing to worry about. Beside, as long as I don't be like her, that's all."
"Well, I guess you're right, but why not turn into someone else like one of our classmates or friends or even teacher but the headmistress?" you asked calmly your girlfriend a question.
"Well, do you remember that you say one day, I become the headmistress, you could fuck me and love me, and I also curious how to feel like the principal." you transformed girlfriend replied.
"I see I never thought that I remember I say that the day when we have our sex. Well, right now shall we continue, "ma'am"?" you finishes before you hold her face and kiss her deeply. The whole experience is sureal as not only are you kissing the body of your headmistress. There is no doubt left in your mind, this is going to be the best vacation for you to remember.