My father is the coach of the volleyball club, so my house is a boarding house for athletic girls from outside the prefecture, and I didn't really care about it until now, but I realized that I was living under the same roof as girls of my age, which was too erotic! I got a full erection every day having sex with them, wandering around unguarded and defenseless! I thought that the girls would find out and tell my father, but the girls of my age were also curious about sex, and they wanted to relieve the stress they had accumulated in their strict Spartan schooling with their dicks!