Lena sat in her bedroom, waiting for Mara to finish with her shower. Just the night before it had been the other way around, Mara waiting for Lena to finish showering. Every night, they would download porn together, and sometimes masturbate in front of each other. They were twins, so they did a lot of things together. It didn't seem too abnormal to share in this particular activity that they would do by themselves otherwise.
The downloading porn part of the activity had been going on since their parents bought them a computer. The masturbation was kind of a result, and everything from then on was done in the open in front of each other. The previous night, the relationship between Lena and Mara changed a bit, when Mara wanted to watch Lena masturbate up close.
Though neither girl had considered themselves lesbian by any means, it had excited both girls immensely, and the night ended with them holding one another while they orgasmed. After that, they agreed to continue their sexual relationship, but neither one of them had spoken to each other much the next day.
So Lena sat nervously in her chair, waiting for Mara to return. She wasn't sure if they were going to watch porn tonight or not, but she was fully expecting to have sex with her sister in some form. Both twins were brunettes, and fairly athletic. Despite their lean builds, they had full breasts, which both sisters were quite proud of. Along with their inherited good looks, both sisters were knockouts.
Soon the bedroom door opened, and Mara walked in. She smiled nervously at Lena, and closed the door. She walked over to her chair next to Lena and sat down facing her.
"Do you want to talk about...it?" Mara asked.
Lena felt a little embarrassed. "I guess."
"We never really talked about what happened last night," Mara said. "We were both so aroused, I kind of just blurted out that we...you know."
"Fuck?" Lena said, quoting her sister from last night.
Mara actually blushed a bit. "It sounds weird to hear you say it, you never swear."
Lena smiled. "I like saying it, it turns me on."
"So, do you still want to?"
Lena looked at her sister for a moment. "I know you want to, Mara. I can tell."
Mara grew excited. "I just don't want to make you do something you don't want to do."
"I want to, I really do. But...I'm not sure how."