My wife's sister Rin came to stay with me while my wife was away on business after giving birth. She offered to help take care of things around the house since I had been struggling with both work and household chores. I gladly accepted her offer, but when she insisted on helping me bathe, we ended up sharing the same bath together. As I looked at her beautiful naked body, I couldn't help but react physically. When she noticed this, she boldly approached me, asking if I got hard because of her. It made me feel good...