You decide to give her what she wants and enter her with your dick, you keep thrusting and thrusting and as you are you can hear your girlfriend whispering something but you can't make it out... It doesn't even sound like English, "what was that honey?" you ask
"oh nothing sweetheart! you're doing great!"
You then start to feel a tightness in your penis and it feels like the condom is squeezing it it feels so tight and arouses you so much that you feel like you are going to burst. But, before you can climax, you instantly feel your dick go numb and you start to lose all feeling in it. "shit" you say to yourself "what the hell is going on?"
At that moment you feel a strange sucking sensation below your penis and you grunt as your balls get sucked into your groin and disappear into your body. "wtf!?" but before you can respond any further your body instantly starts radiating with a unnatural heat and you feel something else strange happen. You then have to re position yourself from on top of your girlfriend to laying down on the opposite side of the bed as her and position your crotches in a scissor like formation because your petrified dick suddenly starts sliding down your groin to be closer to your anus but it stop just above the opening to your anus. At that moment you feel a unnatural tearing sensation at the base of your penis that hurts so bad that all you can do is scream in agony! Then it finally subsides and where your member separated you then feel folds of flesh form around the opening and it gives way to a fully functional vagina and your balls form into ovaries at the same time.
Your detached dick then gets fully covered in silicone and lengthens to over a foot in length and transforms into a double sided vibrator and immediately turns on by itself. You and your girlfriend instantly feel this and you both start moaning in ecstasy. You also experience a female orgasm at the same time, but little to your knowledge your changes were far from over. Not long after the vibrating starts you instantly feel your ass begin to swell becoming rounder and much more plump. At the same time your hips widen to child bearing proportions and all the hair on your body aside from your pubic hair and the hair on your head disappears from your body.
Then the changes move downward to your thighs making them expand slightly at the top to match your hips and then they taper down to thinner and daintier calves. Then your feet shrink down from a size 12 all the way to a size 8 and your feet and legs become unnaturally smooth and soft destroying your extremely callused feet. Once that's over the changes then shift to a upward flow starting at your waist, narrowing it down to a hourglass figure making your ass look much larger than it did prior. Next the changes move to your upper back and shoulders narrowing them down as well making them much less broad and way more dainty. You then feel a pushing sensation on your chest and scream with pleasure as your nipples and areola enlarge to much larger proportions than what you had as a man.
But it does not stop there! You then feel a swelling feeling as your chest is pushed out into two mounds from your chest forming behind your nipples and they keep growing until you have two verry large DD sized Breasts. You then feel your muscles drain from your biceps and watch as your arms and hands slim down to dainty little things and see your nails grow longer. Next you feel a tugging sensation in your throat and begin to cough slightly, you then put a hand up to your throat only to feel your Addams apple recede into your neck and become so small that you can no longer feel it. You then try and say something only to stop as you realize that your voice is much higher and much more girly than it was earlier.
Next the changes move to your head rounding out your jawline and plumping your lips up and making them much more pouty. Your eyes also shift slightly and any facial hair you had disappears from your face. Your eyelashes also grow slightly, next your hair begins to cascade down growing to be long enough to reach your lower back. Finally taking in the finishing touches of your transformation you then look at your girlfriend in disbelief and begin to yell "What the hell happened to me!? I'm a chick! Did you do this to me?"
"Of course I did hon, you were so nervous in bed before hardly getting me off at all so I decided that you needed a change in perspective"
"and you thought that the best course of action was to turn me into a woman!?"
"yes, and soon enough you will really experience being a woman to the fullest"
"what do you mean by that?"