As weird as it was and as wrong as it sounded, the literal puppy dog eyes from Sarah are making you doubt the process less and less. She’s comfortable enough with you to stick a canine dildo inside her while uncomfortably crammed inside a restroom stall, so you figure you can take some liberties as well. You unroll some toilet paper and make it into a thick enough gag to bite down on as you pull your pants down. Your erection pop out and she eyes it the whole time like you’re tempting her with raw meat. You close your eyes and slowly push the wet, smelly dildo into your ass. Your eyes shoot open and grow wide as you feel the dildo shift around in your anal cavity. It’s moving on its own, and it’s causing you to change as well. You snarl and grit your teeth as you unfortunately feel you have gained a new fetish.
Your hands start to shift as if you were a rock climber since birth, with your nails changing to more claws with long black nails coming out. Your entire body’s musculature became more defined and stronger as you could almost hear everything tearing and reforming. Your senses start to become more acute as well, you can hear, see, and smell things you couldn’t before. Your eyes even changed to reflect that as your irises turned a vibrant lavender color. Your hair lengthens out a little as it now falls to your lower back, a couple of tufts stick up making it look like you have horns. The last change that hits you is your dick, which has shifted to look more canine-like. It has gotten thicker and longer, looking about the size of your arm before you changed. It pulses as you cum thick, musky ropes that splatter over the wall, door, and Sarah, who licks herself clean as soon as you finish. She savors your flavor and cuddles you close, giving you some decency and making you feel loved as you are still adjusting to your new form.
You both leave the restroom as your clothes barely fit you, your new bulge threatening to destroy your pants with the slightest hint of a boner. You get a few glances from both guys and girls, even the teachers are impressed with you, but no one questions your change. A part of you wonders what else has changed or if you have any new abilities thanks to your transformation. But you don’t wait long to find out.