FSDSS-492 When I succumbed to my older sister's defenseless temptation and immediately fucked her, I suddenly changed! 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 the piston suddenly ejaculated. I thought my sister-in-law would get mad at me, but the next day she began showing me her panty shots and seducing me...