We are a trio of childhood friends who have been close since elementary school. One of them, Kei-kun, confessed his love to me and we started going out, but I had never dated anyone else and honestly didn't know how good sex felt. Of course, I had never known any other penises besides Kei-kun's. But... my pussy was so loose after experiencing a penis that reached all the way to the back of my belly button that I felt like I was going crazy with orgasms every time that penis hit my uterus.