A bright and kind yariman sister proposes to teach her overly negative virgin brother as a specialized tutor in ecchi, and the two study hard towards the loss of virginity! However, everything she says and does is too stimulating for the virgin, causing him to get a full erection! When she sees her brother's fully erect penis, she can't hold back her yariman nature any longer! She forcibly inserts herself and becomes so addicted to her brother's penis that she drools and cums, causing her to have a series of explosive orgasms with the virgin penis!
