I did that several times. The first time I allowed them to stuff me with marbles they ended up using a cut back plastic funnel to fill me up. I then had to stand up to see if they would stay in. I had no idea why they wanted to see if they would. Some did start to fall out when I walked around the room so they pushed in some of those bigger marbles and that seemed to keep them jammed in. Then they told me to get dressed and we went down the pub not the most comfortable of experience s but over time was one to be often repeated. When we got back they tried to fuck me with the marbles still in and removed them one at a time until they could. Now I did enjoy that and like I said allowed them to experiment even more.