I was probably 13 or 14 when I started using a deflated red and white, smooth plastic beach ball. I slightly folded it in a way that holding it out in front of you, the white color was on the left and most of the red color was on the right. This did not matter as much as the folds, they had to fit between my legs over my genetalia which they did. I then would proceed to rub real hard on the deflated beach ball and against my dick. I had no sense back then and used nothing to lube me.
Occasionally I would clean the ball by getting some toilet paper wet with warm H2O and scrubbing the side of the beach ball where my cum was. Sometimes I would beat off on the ball while it was still wet, when I was alone in the house. I think I remember the summer that I started masterbating, I had just got this beach ball free at a store promotion. I really liked jacking off in the ball as it was really comfortable and felt really good against my genitals.
One time I had it in my groin and was in the act, when my mom came in my bedroom. To this day I don't think she knew what I was doing. I had my underwear fairly close to the ball (on my thighs) and my pants or shorts were around my lower legs.