Jen gulped, and when her mom started walking towards her, she couldn't move.
"Jen, now you are going to be a good daughter and help your mother with her erection. We'd better go somewhere else, it's tight here." her mom said and, taking her by the hand, guided her to the back exit of the house.
As they walked Jen noticed that her mom was taller and what was left of her clothes was tighter against her body. Also, she was growing a tail above her ass. When they leave Jen's mother's clothes started to tear everywhere, and soon they didn't resist and broke into pieces. Her horse cock continued to grow, but the growth now affected her entire body.
Jen, at the request of her mother, helped her to stroke her cock, which quickly became bigger. When she realized that her mother's dick alone was already bigger than her entire body and held onto her member while supporting her feet on her balls, she saw that her mother was already 10 feet tall and the tip of the dick it was slightly above her head.
Jen saw that part of her body was growing more than others, her breasts were much bigger, and brown fur was spreading all over her body. Her face was elongating, losing its human appearance and becoming more and more equine.
Eventually Jen's mom got louder than her house and still didn't keep stroking her dick. A different sound made Jen look down and thus see that her mother's feet were hooves now, just as her legs were the equivalent of a horse's hind legs. After growing so much, Jen's mom finally reached her final size, she was so big that she sat on the roof of her house, destroying part of it making the rest of the house creak with all the extra weight over it.
Jen was taken in the hands like a doll by her mother, who was now a gigantic anthro shemale horse, who lifted her and placed her on the flat tip of her equine cock, which was so big that she could barely reach the tip. She had enough room to sit comfortably on top of the cock, and her mother's balls appeared to be as big as her entire room.
"Don't just stand there looking at the landscape Jen, do something." her mom said
Jen had no way to escape being on top of the huge pillar of horse meat, so she surrendered to her mother's request by lying on the flat tip of her cock and licking the edges of her urethra, which she would easily put her head inside and she thought she might be able to throw herself in there if she wanted to.
"That's it Jen, keep doing this and I'll get there." her mother said and moaned, now with enough intensity and volume to call everyone's attention.
After almost five minutes her mother's movements and the cock's pulsation became more intense, and Jen realized that it was her orgasm coming, so she held on as best she could to the flesh of the cock. Her mother came and, as she ejaculated, she was nearly thrown out. A veritable geyser of equine cum shot into the air and rained covering the house next door behind them in white.