The shared living room of the siblings was a familiar space, filled with the comfortable clutter of two people who had spent many years growing up together. The brother, feeling the familiar stirrings of horniness, glanced over at his sister, who was engrossed in a book.
He approached her, a mischievous glint in his eye. "Hey sis," he began, "I need a favor from you."
The sister looked up, surprised and amused. "A favor? What kind of favor?" she asked, playfully insulting him. "You can't even remember to do your own laundry."
The brother persisted, promising to do her a favor in return. "Come on, sis. I'll do anything you want. Just name it."
The sister, still hesitant, negotiated the terms of the deal. "Fine," she said, "but you have to agree to my terms. And no backing out once we start."
The brother agreed to the sister's terms and she finally relented. "Alright then," she said, a wicked smile playing on her lips. "Let's get started."
The sister began to jerk the brother off, but not before giving him a few hard slaps on his cock as a warning. The brother winced in pain, but also in pleasure. "Hey!" he protested, but the sister just laughed at his reaction.
She continued to jerk him off, alternating between soft and hard strokes. The brother couldn't help but moan and groan, much to the sister's amusement. "Like that, do you?" she asked, smirking.
The sister slapped his cock again, harder this time. The brother yelped in pain, but also in pleasure. "You're such a tease," he groaned, but the sister just laughed and continued her ministrations.
She increased the pace and pressure, bringing the brother to the brink of orgasm. But just as he was about to release, the sister stopped suddenly. The brother looked at her, confused and disappointed.
The sister smirked and told him that he'll have to wait for his release, leaving him hanging and wanting more. "Not so fast, brother," she said, her eyes sparkling with amusement. "I'm not done with you yet."
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