[MIAA-300] The virgin brother who truly received the provocation of the elder sister does not notice that it is it, and the explosion piston, Eria Oka

I made a joke of my younger brother who wasn't popular. The virgin brother who thought that he was truly receiving a joke and inviting him immediately inserted a chimpo into his sister immediately after his parents went out. The younger brother who is not accustomed to the woman does not notice and continues to swing the waist to the gumshara in the state through though it is Euri who has gotten to the top with too much power. The top is repeated many times in the piston which does not stop even if it is the height, and it continues to be squid until parents return home single-mindedly.