Well, it is exactly what it sounds like. It’s a shoebox, or at least once was, and whenever I masturbate I cum into it. I’ve had it for two or three years now I think, so it has a fair amount of cum. It smells atrocious, and I tried to burn it once. When I lit it on fire, it was too damp due to the cum that it simply sizzled and didn’t manage to actually lite up. Turns out burning cum smells awful, so I had to spray it with a deodorant body spray just to get the old smell of burnt cum away. It also has some drenched papers stuck to it. That’s pretty much it.
Because people were asking, my greatest shame. (Ed: “my greatest shame” links to an actual fucking imgur gallery of his cum box.)
EDIT 2: A lot of people are asking me, why? Well, I’m apparently a rather disturbed individual. But, it just kind of happened, bought new shoes and needed someplace to cum, used the box. It just escalated from there, kept using it each time, telling myself I would throw it out soon. Never did, two or three years later, I still have it. It was planned or anything, it just happened.