Happy summer vacation at my cousin's house

The young man was happy when on one of his summer vacations, he went to his cousin's house to play. The two girls at home dressed very carelessly, making his brother drool. The two younger siblings were studying biology when he went into the room to play, to see if he could help, but unexpectedly the lesson he was studying was about the human penis. And he accidentally became a place for the two girls to study and practice all kinds of things :))) Actors: Yui Tomita, Ai Sena