Your brothers boxers

You hold up the pair of sporty black boxer briefs. Stolen out of the dirty laundy hamper in the bathroom you share with your twin brother. Youre heart skips a beat as you slowly slide the boxers up your legs. They rest neatly on your waist. Your soft feminine bottom filling out the boxers nicely, giving you a nice sporty tomboy vibe.

You let out a small moan as you rub yourself through the cloth. Only a pervert would jill off in stolen boxers like this. Your cunt twitches and tingles as you play, feeling a lot more sensitive then normal. You rub harder and faster, your clit feels like its on fire, you can even feel it stiffening up. Does it feel bigger than normal?

You gasp as you feel yourself cum, you feel as though youve been zapped with a thousand volts straight to your sopping wet cunt. You fall backwards onto your bed as your legs give out. Your eyes rolling back in orgasmic bliss.

Something is definitely happening. Your clit is definitely bigger, at least 4 inches bigger at this point, your abdomen feels like its on fire, cramping like crazy, as though something were being pulled out of you. You looks down at your crotch in astonishment, it looks like you have a cock. Holy shit you do have a cock, and a huge one too at least 9 inches long by your guess, and a big full set of testicles resting neatly at the base. Pitching one hell of a tent in the boxers soaked in your juices, you feel its length twitching in anticipation, hot and hard, sticking out from your crotch right where your pussy should be.