Sandra had pressed the button thinking of herself, and then she looked down to see her smiling little corgi. The second press was at the corgi who immediately started to grow bigger, and shed like crazy. Sandra was surprised as she saw the neutered pup grow big, and start standing on two legs as it's front legs turned into arms, it's features becoming human-like... no for sure human, and... Oh god he grew his balls back! With interest. Sandra heard a snapping sound and only then noticed that her bra had snapped from pressure. Looking at herself her once alright B-cups were now the size of small melons, and... what's this at the side of her vision? hair? Sandra brushed her hair and found her short hair now long and luscious. Next step her stretched out and snapped clothes vanished.
"Mommy... I feel weird." A deep voice said. Looking Sandra saw that Stew was now an adult human MAN devoid of clothes, and it was hard not to notice his... erect package.
Sandra said "Well ugh... mmmm... so do I..." both of them were starting to be wracked with lust. With some of his canine instinct left he pounced on top of his prey and started to kiss Sandra all over. "...bad boy... ugh.... AAH Bad-... oooo Goood Boy!" Thankfully Stew's dick was fully human as well, and it was long enough that while at first the unexpected penetration was alarming. The Sex machine had made the experience as euphoric as possible. Sadly Stew being new came really fast, and Stew stopped his attempts at intercourse. He was still over Sandra and started shrinking and getting fluffier till he was back to his corgi self. Just smiling at his master. Sandra sighed and said "...Yeah keep smiling you little Fucker..."