Belle then looked at her father. He was like a male intruder in a room full of young women, and his boner wasn't helping. Bell hit him with her eyebeam.
Clothes were the first things to change: a cowboy hat appeared on his head, his shoes became cowboy boots. His blue Jeans didn't change much but with his red and white plaid shirt, he really looked like a cowboy.
Then the physical changes happened: his face became round and feminine as his hair gew way down to his back. He de-aged quickly to become 20-something years old. His boner vanished as his genitalia became female and his hips became larger. He opened his plaid shirt which was becoming too tight as two pairs of breasts grew on his hairless chest. Cow horns grew on his head, a cow tail grew on his back, and his feet became cow hooves.
Thunder approached the hucow who used to be her husband and complimented her on her gorgeous body. The newest supersister squeezed her four breasts and a stream of raw milk went right inside Thunder's mouth. As soon as she drank the milk, Thunder began to change. She grew another pair of tits, cow horns on her head and a tail too. The more she changed, the more she became like her nameless sister, until the two became completely identical. Only their clothes didn't change.
"That's strange" said the two cow-women in unison "We have two bodies ! We can see us !"
"What did you do to Thunder ?" asked Belle.
"That's our power" replied the two women. "We are the Herd. Anyone who drinks our milk will become part of us. It's only temporary; the more you drink milk, the longer you become us. Thunder didn't drink much, she'll be back soon."
" I hope so" said Light, still a bit frightened.
As the Herd said, a few minute later Thunder morphed back to herself and said: "That was intense ! But good, in a way. So what is your name, sister ?"
"Even when whe only have one body, we are the Herd. That's our new name."
Belle asked "So, what if we all drink your milk and have fun for one hour ?"
Everyone agreed with Belle, and the Herd gave enough milk to transform each of the sisters. The Herd then had fun will all her 7 bodies, trying sex with 1, 2 or more bodies at the same time. THey masturbated with 1 body, then use 5 ore bodies to suck the 4 nipples and the pussy of their last body. Then they switched to do wilder things and they experienced pleasure far beyond anything they could know when they had been a man, such as having 7 orgasms in 7 bodies at the same time.
One hour later, the Herd were tired and they transformed back. Belle knew it was time to give her twin sister cool superpowers too, so her superheroine family/harem could be complete.