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One day, my sister, who was lazing around in my room, asked me to give her a massage, and during the massage, I secretly took a picture of her panties on my smartphone. My sister saw me masturbating in the room while using the secretly taken picture as a stimulant, and threatened to tell everyone that I was taking secret photos, so I had to show her my masturbation... As I desperately stroked my dick, my sister showed me her panties in front of me, licking her fingers with her erotic tongue. Seeing that, I was so excited that I ejaculated a lot of semen! "Sis, we haven't had sex recently, so please help me..." And so I took my first step into the forbidden act of incestuous sex with my sister...