Bob couldn't help but feel a mischievous grin spread across his face as he glanced over at his sister Sarah, lounging on the couch in their shared living room. She was wearing a skirt that day, and something about the way it hugged her hips and thighs just begged to be messed with.
Without a second thought, Bob crept up behind Sarah, planning to pull down her skirt just enough to reveal the thong he was sure she was wearing underneath. But as he yanked down the fabric, he was met with a shocking surprise - Sarah wasn't wearing any underwear at all.
Sarah let out a yelp of surprise as the skirt was pulled down, exposing her bare bottom to her brother's gaze. She quickly turned around and slapped Bob on the arm, trying to cover herself up as best she could.
"What the hell, Bob?" Sarah exclaimed, trying to keep her composure. "That's not funny!"
But Bob couldn't help himself - he couldn't take his eyes off of his sister's perfectly sculpted ass. He knew he shouldn't be staring, but he couldn't help it.
Sarah, realizing what was happening, couldn't help but smirk at her brother's reaction. "Looks like someone's excited," she teased, raising an eyebrow.
Bob, still trying to play it cool, stammered out a response. "I was just...surprised," he said, trying to sound nonchalant.
Sarah, still holding her skirt up, grinned wickedly. "I bet you were," she said, letting the fabric slip just a little lower on her hips.
Bob's eyes widened as he took in the growing bulge in his pants. He tried to discreetly adjust himself, but Sarah had already noticed.
"Oh, you like what you see, big brother?" she asked, her voice dripping with sarcasm.
Bob, unable to take his eyes off of her, stuttered out a response. "Uh...yeah," he said, his face turning bright red.
Sarah, satisfied with her brother's reaction, finally pulled her skirt back up. Bob, still embarrassed, tried to change the subject.
"So, what are we watching?" he asked, trying to act normal.
Sarah, still grinning, replied, "I was thinking of putting on something...risqué."
Bob's blush deepened. "Like what?" he asked, trying to keep his voice steady.
Sarah, with a twinkle in her eye, said, "Oh, I don't know. Maybe a movie about a brother and sister who can't keep their hands off each other."
Bob's jaw dropped. "W-what?" he stammered.
Sarah, laughing, said, "Just kidding. But it would be pretty funny, wouldn't it?"
Bob, still blushing, nodded. "Yeah, I guess it would," he said, trying to play it cool.
Sarah, with a playful smile, added, "But don't get any ideas, big brother. I'm not that kind of sister."
Bob, grinning, replied, "I know, I know. You're the boss."
Sarah, satisfied, settled back into the couch. "Damn right I am," she said, a confident smile on her face.
Bob, still embarrassed but also turned on, couldn't help but sneak glances at his sister throughout the rest of the movie. As the credits rolled, Sarah turned to Bob and said, "Well, that was fun. Want to do it again sometime?"
Bob, still blushing, nodded. "Sure, sis. Anytime," he said, trying to sound casual.
Sarah, grinning, said, "Good. I'll hold you to that."
Bob, feeling a mixture of embarrassment and excitement, couldn't help but think about the next time they'd pull a prank on each other.
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