A high school boy's friend's sister finds out that he has sensitive nipples. Seeing this, the sister's 'slutty Kokoro' is ignited! The high school boy gets a full erection after having his nipples thoroughly played with! Unable to hold back, the sister pushes him down and...inserts it raw without a condom! While playing with his nipples, she pistons him to the brink in a spider cowgirl position! After being thoroughly played with, he can't hold back and cums inside her!