Her nipples increased in size and all 4 breasts grew another cup size and started lactating.
Susan started sucking one and then a boy came up to her as well. Jen didn't mine because Susan said she loved it. At the same time she continued to masturbate. Soon a line formed and everyone wanted some milk. Someone said, "All that milk it is like she has cow udders."
Jen continued masturbating while she felt another tingle as her breasts morphed into cow udders. Each one got larger and the nipple split into 4 and got longer and thicker until they were 4 cow years on each udder. Also the udders were normal human skin color and not pink like a cows.
Jen didn't want cow udders, but loved being milk and now a group of 16 could suck them off at once. She orgasmed as they did even a few teachers were getting her milk.
Kyle was one of them. He said, "This serves you right you horny slut."
A tingle again as the cured changed her to literally have horns. Also she was thinking she was slut. She'd fuck anyone anywhere. A small part of her thought this wasn't right, and she wanted to be normal, but mostly she thought about having a cock in her. Any ones cock right now.