Agatha has decided to use a (brand new never used) plunger on her belly button. It feels so good. And the suction stimulates her tiny belly button. She sticks it to her bellybutton and bounces around, enjoying the sensation. Then she pulls it off with a pop! And feels the warm red ring around her bellybutton from the suction. She does this again and again until the stimulation brings her to belly button-gasm.