She would probably get in trouble for it, her mom would probably not be on speaking terms with her, she might even be spanked like she was as a little girl. But that was what she decided to do. Marina grabbed the dropper full of thick black and white serum and spread it on a sheet of plastic wrap. When she felt like it was good enough, she lined her doorway with it. She patted herself on the udder for a devilishly good job and waited for the moment to happen.
Sure enough she heard a knock at the door about 5 min later. Marina yelled out, “It’s open!” As her mom opened the door, she was met with a black and white screen that she ran into, nearly encasing her in the sheet. Marina got a hearty laugh out of it and went over to help her mom out of the plastic wrap before telling her “Surprise! You got pranked!” It earned her a slap from her mother as she nearly laid into her, but she started feeling weird. She walked over to the couch and sat down, Marina noticing her mother’s skin turning black and white like hers. Her mother was by no means ugly or obese, but she had aged into her late 40s and her lifestyle is more relaxed since Marina moved out. Even so, her “typical mom bod” inflated a little more, her tits perked up a bit without botox, and her ass grew a little bit more. She moaned a little at her expanding frame, not forgetting that her daughter caused this and barely man aged to say “You......a-ah-are in sooooooo much mhm trouble.” Her hair started turning blonde like her daughter’s was, she slid out of her shoes as her feet turned black and hard, shaping into hooves. Her belly grew a large bump that started expanding rapidly as she grew horns on her head, a pink cow nose, a tail, and blue eyes, all exactly like Marina, just a little bigger, older, and taller. Once the changes had settled down, she took a deep breath and looked at her child, “Young lady, you have some explaining to do. Why did you do this to me?” Marina knew she was more confused than upset, she could tell as she looked herself over that she didn’t think all those changes were bad. She then went to explain her situation to her mother in great detail.
After the lengthy explanation, she added on this little part here, “which is why I thought this would be perfect for you, but you’d never agree to it. So I set up this elaborate prank so that you’d show up and come here and get this for yourself.” Her mother stood up, reached under her blouse, and pulled off her panties. She then reached behind her and unhooked her bra, letting it fall to the floor. She then took a really deep breath, placing her hands on her hips, “I won’t lie, I haven’t felt this good in a long time. I might even have some fun with your father like this. Just don’t you ever scare me like that again, promise?” Sounds like she got off scott-free for transforming her mother. They hugged it out she waved goodbye and left, leaving her bra and panties behind at Marina’s apartment. Marina laughed at her mother for doing that, but as she looked at them.