I had to stay at my older brother's house while preparing for university entrance exams. When I arrived, I caught a glimpse of my sister-in-law cleaning the balcony, and accidentally saw her panties—my heart started racing. Even though she knew I was watching, she deliberately exposed her panties around the house while doing chores. I became increasingly aroused, my cock hardening involuntarily, and she noticed. Unable to suppress her own excitement, she let her desire show. As I was about to enter the bath, with my brother away, I couldn't resist touching her big ass and pressed my cock against her. Turned on by my actions, she took my cock into her mouth in the kitchen while my brother was bathing. Late at night, I peeked into my brother's bedroom and saw her greedily sucking his cock, as if to provoke jealousy. After he fell asleep, she sneaked into my room, devoured my cock again, climbed on top of me, and we crossed the final line. As I pounded her hard and fast with my young, energetic cock, she couldn't suppress her moans and began to cry out. This intense affair became the ultimate climax of the night.