Sarah couldn't sleep. She tossed and turned in her bed, her mind racing with thoughts of her sister Lily. She knew she shouldn't be thinking about Lily like this, but she couldn't help it. Lily was just so beautiful, so perfect.
Finally, Sarah couldn't take it anymore. She slipped out of her bed and quietly made her way to Lily's room. She turned the knob slowly, wincing as it creaked softly. She stepped inside and closed the door behind her, her heart pounding in her chest.
Lily was lying on her back, her mouth slightly open as she slept. Sarah couldn't help but stare at her. Lily was the prettiest person she had ever seen. She carefully lifted the covers off of Lily, revealing her shorts. Sarah felt a little thrill at the thought of seeing her sister in her underwear.
She slowly and gently slid Lily's shorts down her legs, revealing her panties. Sarah was surprised to see a dark stain on them. She leaned in closer to get a better look, and she could smell the faint scent of Lily's arousal. She felt a sudden jolt of desire run through her body.
Sarah looked up at Lily's face, and she saw that her sister was stirring. She quickly pulled her hand away, hoping that Lily didn't notice what she was doing.
"What are you doing, sis?" Lily asked, her voice sleepy.
Sarah felt a rush of embarrassment, but she tried to play it cool. "I was just checking to see if you were okay," she said.
Lily raised an eyebrow. "Really? And you had to take off my pants to do that?"
Sarah felt a flush of heat spread across her cheeks. "I, uh, I was just making sure you were comfortable," she stammered.
Lily chuckled. "Well, I am now," she said, sitting up and stretching.
Sarah couldn't help but stare as Lily's breasts pushed against the fabric of her shirt. She felt her desire growing stronger.
Lily looked at Sarah and grinned. "You know, sis, you can look all you want. I won't tell anyone," she said.
Sarah felt a thrill of excitement run through her body. She knew she shouldn't be doing this, but she couldn't help herself. She leaned in closer to Lily, her eyes fixed on her sister's lips.
"I've wanted to do this for so long," Sarah whispered.
Lily's grin widened. "Then what are you waiting for?" she asked.
Sarah didn't need any more encouragement. She leaned in and pressed her lips to Lily's, feeling a surge of pleasure as their tongues met. She knew this was wrong, but it felt so right. She couldn't help but wonder where this would lead.
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