After school, Meru-chan was left alone in the classroom for extra training because she couldn't do a bridge. Called out by her teacher, she expected a confession—only to be urgently begged to show her navel instead. Reluctantly agreeing, the teacher pretends to instruct her while secretly observing. Growing aroused, the teacher suddenly orgasms. From Meru's slender waist, her shyly exposed navel emits a unique scent, which the teacher deeply inhales. Each time she's sniffed, Meru's abs twitch involuntarily, and the teacher probes and cleans her navel with the tip of her tongue. "Slightly bitter, but delicious," she murmurs, thrusting her tongue rapidly in and out of the navel with saliva, making Meru climax from the act.