In the after-school classroom, Niina waits, heart pounding, for a confession from you. However, your request is to explore her navel. Niina, both intrigued and embarrassed, reveals her deep belly button. Using cotton swabs, you let Niina to meticulously clean it, uncovering surprising lint. Niina's anticipation turns to confusion in this unique, POV journey of navel play and subtle humiliation.