A man who has a grudge against a girl in his class gets in touch with a teacher on an internet bulletin board and asks for a substitute lewd!On that day, when I was on the usual train, a stranger groped his buttocks!The perverted man's actions escalate and he inserts himself raw in the back! !Even though I got it, I'm embarrassed that I got it with a slut, I'm embarrassed, and when I can't say it, the persistent piston doesn't stop trying to make me squid, and I cum inside!The tragedy isn't over yet...