Rin is a lively and cute girl. When she opens the door to her room as usual, she finds her brother in the middle of masturbating! Rin is full of Kokoro and is very interested in watching her brother masturbate! "Hey, brother...let me see how you continue masturbating?" The perverted brother gets his cunning and gets his innocent little sister to help him masturbate! When he rolls up his sister's clothes, he finds her beautiful, full breasts! Brother can't hold back anymore!