I was so tempted by my sister’s unprotected seduction that I gave in and had sex with her right away! I was given an erection by the temptation of her panty show. Natsu Igarashi

I had an older sister due to my parents' remarriage. His sister-in-law is a cool and beautiful woman with an outstanding figure, but she was defenseless and often flashed panty shots. One day, she finally reaches the limit of her patience and inserts the...