Indulging in self-pleasure in my sister-in-law's underwear, leading to a massive climax

After a steamy shower, I found myself in my sister-in-law's cozy bedroom, drawn to her irresistible scent. Her panties, a tight thong, were on the nightstand, beckoning me. I couldn't resist the urge to slip them on, feeling a rush of arousal at the thought of her wearing them. The fabric against my skin was intoxicating, fueling my desire. I indulged in self-pleasure, lost in the fantasy of being her, feeling the intense pleasure build up. As I reached the brink of ecstasy, I imagined her watching, her eyes filled with desire. With a final stroke, I released, painting her panties with my hot load. The sight of my essence in her underwear was the ultimate satisfaction, leaving me breathless and content. I savored every moment, relishing in the taboo thrill and the sheer pleasure of my release.