After my last wild escapade at my sister's place, I vowed to keep my distance. But, curiosity got the best of me and I found myself back in her abode, snooping around. As I rummaged through her belongings, I stumbled upon a peculiar obsession - her meticulously arranged underwear collection. Intrigued by her unique fetish, I decided to indulge her once again. This time, I found her in the throes of passion with her boyfriend, their bodies entwined in the guest room. Seizing the opportunity, I joined in, taking over where they left off. My sister's moans filled the room as I explored her petite curves, my hands tracing the contours of her body. Her natural, ample breasts beckoned my touch, and I obliged, leaving her panting and desperate for more. The climax of our encounter was a messy finish, a testament to our shared passion. As I withdrew, I left a trail of evidence, a reminder of our steamy encounter.