FSDSS-492 When I succumb to my older sister's defenseless temptation and have sex with her, everything changes suddenly! - I was made to erect by showing off my seductive panties. - Natsu Igarashi

I had an older sister due to my parents' remarriage. - My sister-in-law is a cool and beautiful woman with an outstanding figure, but she was defenseless and often flashed her panty shots. - One day, I finally reached the limit of my patience and inserted the panty shot into her beautiful ass, and it pistoned hard and ejaculated. - I thought my sister-in-law would get mad at me, but the next day she began to be seduced by showing me her panty shots...