(All characters in this story are over the age of 18)
The twins first time was just a few days after their birthday. While Candy bathed, Sandy sat and stared at the poster of the lead singer of her favorite boy band. She was still wondering how it would be to actually meet him when Candy finished her bath. She ran a fresh tub of hot water and got in, still thinking about how handsome he was. She was still daydreaming about him when she realized that she was rubbing that spot between her legs with the soapy washcloth. He was so good looking. It felt so good. She kept daydreaming. She kept rubbing. It felt so good. And then it felt so much better than just good. She squealed her delight and kept rubbing.
When Candy got back into the bathroom, Sandy was sitting in the tub trying to catch her breath.
"What's wrong, Sandy? I heard you scream!"
"Oh, my god, Candy it felt so good!"
"What? What felt good? Why did you scream?"
"Get in. Take off your nightgown and get in! Let me show you!"
"What?"
"Get in. Take off your nightgown and get in! Quick! Let me show you!"
Candy took off her nightgown and slipped off her panties.
"Hurry up, Candy. Sit here in front of me."
Candy slipped into the tub between her sister's legs and Sandy began to rub her sister's cunt with the soapy washcloth.
"Sandy!"
"Shh. Let me show you."
A few minutes later Candy began to understand what her sister meant. And then a couple of minutes after that she gasped, and stiffened and squealed even louder than her sister had a short while before.
"Oh, my god, Sandy! Don't quit! That feels so good! What is it?"
"I don't know, Candy! But I like how it feels!"
"So do I! Do you want me to do it to you?"
They switched places and a few minutes later Candy was rubbing Sandy's pussy with the soapy washcloth.
For the next several months the twins shared the tub almost every night. And then one evening they decide not to wait for bath time. They undressed and stretched out on Candy's bed.
"Candy, do you want me to touch your boobs?"
"Uh huh. I think that feels good, don't you?"
They fondled each other's tits for several minutes before they began stroking each other's clits. In just a few minutes they were both cumming.
"Sandy"
"Hmm?"
"I think I like it this way even better than in the tub."
"Me too."
For the next several months they took advantage of their mother's second shift job, bringing each other to multiple climaxes several times a week while she was at work.
It was only a few weeks before their next birthday that things changed. It was nine o'clock. They had eaten dinner and their homework was done. They'd had their evening bath and they stretched out nude on the bed. For the next several minutes they petted and caressed each other's tits, enjoying the excitement as their nipples got bigger and harder. They had just started stroking each other's cunts when they heard their mother gasp.
"Holy shit! What the fuck are you two doing? Holy shit!"
"Oh my god, Mom! We thought you were at work!" The twins sat up and tried to cover themselves.