You could feel the injection enter your shoulder, like the many biannuals you've had before this one. It wouldn't take long now. In just a few moments your limbs would be in full working order again, and odds were you'd either be a woman for two years or you'd get yourself any favor you could think of. Oh you could hardly wait. You could feel a tingly, burning sensation in your spine. It always happened with the injections, nothing to be done. Even with how many times you've taken a biannual you never could get used to the spine tingles. By now you should be feeling your limbs regenerating.
You felt the tingling spread from your spine, but not to your shoulders or hips like you've come to expect. This burning felt different. You felt it in your chest, your crotch, your buttocks! You were about to transform into a woman. Your body's mass was being allocated to both your chest and butt as they surged forth and filled out with bounce and squish. The burning in your crotch multiplied as you felt your body absorb your manhood, caving in and inverting into a vagina and uterus. Then, the burning tingles went up to your face as your features became more soft and feminine, and your voice went higher as your Adam's apple vanished. Alan had done it. He'd turned you into a woman. Your head throbbed and your crotch was on fire. You could feel your body involuntarily arching your back as you felt spasms of lust. Overwhelming lust. You were going into heat.
"Ryan? Ryan!" Alan shouted worriedly, "Your vitals are unstable! Speak to me! Are you alright?!"
"He's going into heat!" Natalie shouted, "Quick, get me the vibrator! I can bring down his urges and re-stabilize him! I can hardly believe it! You turned him into a woman, Dr. Weiss!"
"It... burns...," you manage to gasp before your horny heat starts demolishing your ability to properly form words, "Hsgfsff shfkhg dfhh ff!" With the swiftness of Hermes, Natalie sticks a sanitized vibrator into your crotch and thoroughly massages it until finally you're brought to orgasm. Your body begins to calm down. Your heat has been extinguished.
"Vitals are now stable," Alan reads out, "but it doesn't appear the injection is regenerating his... her limbs. Matter of fact it seems to only be interested in permanently making Ryan into a woman!"
"Y-you... mean..." you pant out your inquiry, "I... lost... the... bet?"
"Half lost the bet, it looks like," Dr. Weiss shook his head, "Until we can get you a normal shot, looks like you're a limbless woman for a while."