Katie's step-bro walks in and gives her a biscuit, they have a quick chat as she eats it about how she's going out later. All of a sudden Katies tummy feels weird and she starts growing bigger and bigger. Her breasts and ass are bursting out of her clothes and she has to take them off.
She keeps growing taller until she can touch the ceiling, she is confused why her step-bro has done this but it then becomes very obvious.. he starts touching his cock Infront of Katie. Clearly he likes big, tall women.
Katie decides she actually quite likes the feeling of being big, it makes her feel powerful. She starts rubbing her pussy until they both cum.