I went on a hot spring trip with my family. My sister-in-law said, "Let's bathe together ♪" and invited me. Unable to refuse, I ended up in the mixed bath with her. Suddenly, she started sucking my cock and rode me in cowgirl position. That night and again the next morning, I gave in to her seduction, getting fucked all day long. This aggressive woman dominates me with tongue kisses. The intense affair in the outdoor bath grows even hotter with NTR elements. A shocking hot spring love story where brotherly bonds and sexual desire collide.