[YSN-473] My grumpy older sister started taking it out on me and eventually started tormenting my dick. She saw that I was getting an erection even though I was scared, and teased me, squeezing my semen tank until it was empty. (Censored)

My older sister, who is on her period, was in a bad mood as soon as I got home, probably because something unpleasant happened outside. She's usually kind, but today she's been picking fights with me and bullying me. She even teased me about my lack of interest in women, and suddenly started stroking my dick vigorously, spitting on it, and licking it. Despite feeling scared, my dick started to get hard in no time...