When I removed the rubber band and inserted it raw, my older sister suddenly changed! My sister, who is taking the entrance exam for an extremely difficult university, is studying every minute and every second. My older sister, who dedicates all her time to studying, doesn't do anything like masturbation, let alone romance, so she always calls my younger brother to me, puts on a rubber band, and inserts a rubber band into me to get rid of my accumulated sexual desires.