When Chad saw who spoke he was mortified. His sister Susan was massaging his cock. They had a rivalry for as long as Chad could remember. Even though Susan was Chad’s older sister he always won their fights. Susan always vowed revenge. And now it looked like she’d get it.
“Are you a good puppy Chad?” She teased her younger brother. Chad felt the hand slap his swinging balls.
“YIIP!” Chad cried causing everyone to laugh.
Susan massaged Chad’s rear end admiring the transformation. “My god Chad, look at you. Why don’t you wag your tail for everyone to see?”
Without thinking Chad turned his naked hips to the class and wagged his tail. He heard someone mention how cute his tiny asshole looked. That caused his face to turn red.
The Teacher spoke again. “Now Susan if you would, finish him off.”
Susan nodded. “Arlight bro, enjoy cumming for the last time.”
Her hand wrapped around her younger brother’s cock. Pre crum already dripping down onto the table. With stead strokes his sister’s hand trailed up and down his shaft. Every so often she’d give him a soft squeeze.
Chad’s tongue rolled out of his mouth. He tried to hard not to enjoy his sister molesting him, but god his cock felt so good. Each movement of her hand sent pleasure rocketing up his cock throughout his body.
Susan leaned in close to one of Chad’s dog ears and whispered. “You’re a good boy aren’t you bro? You like when your older sister touches your cock don’t you?”
Her movements quickened. Chad’s entire cock was tingling now and pressure began to build. He began to pant as his cock twitched. He hated to think about it, but the thought of mounting his sister drove him to the brink. His transforming human dick into a red dog cock knotting her damp pussy was making Chad insane.
He started whimpering as his hips thrusted. He was almost there.
“Oh are you cumming bro? Does the puppy want to cum?” Susan teased.
Chad had lost his voice, he could only reply in whines and a furiously wagging tail.
Susan rubbed his cock faster, ready for him to burst. “Well then…” Susan smiled. “How about we…”