The shared living room of the siblings was filled with the warm glow of the setting sun. The brother, feeling bold and mischievous, turned to his sister who was lounging on the couch.
"Hey sis," he began, a smirk playing on his lips. "Would you do me a favor and jerk me off?"
The sister, taken aback by the request, looked at him with wide eyes. "Only if you promise not to cum in my hand," she replied, a playful insult lacing her words.
The brother, undeterred, chuckled. "I promise, I'll be good. You can even slap my cock if you want to."
The sister, intrigued by the idea of having control over the situation, raised an eyebrow. "Fine, I'll give it a try," she said, a hint of amusement in her voice.
She reached out and gripped his cock firmly, sliding her hand up and down its length. The brother let out a low moan, enjoying the sensation. The sister, not wanting him to get too comfortable, decided to take him up on his offer and gave his cock a firm slap.
The brother, surprised by the sudden sting, yelped and tried to pull away. But the sister held him in place, continuing her teasing. She alternated between slow, steady strokes and hard, fast slaps. The brother, writhing in pleasure and pain, begged her to stop. But the sister just laughed and continued her torment.
The brother, on the brink of orgasm, tried to warn the sister. But she ignored him and slapped his cock one last time. The brother, unable to hold back any longer, came hard, shooting ropes of semen all over the sister's hand.
The sister, satisfied with her work, wiped her hand on the brother's shirt. "Go clean yourself up," she told him, a smirk on her face.
The brother, still reeling from the intense orgasm, stumbling off to the bathroom. The sister chuckled to herself, feeling a sense of power and amusement. She decided that this might not be the last time she indulged her brother's strange request.
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