I would be quite interested in seeing what exactly you do with it all once it is full. Photo's please!

This isn't a totally alien concept to me, as a Mistress one of the games i have played with a slave is along the same idea - having the slave save his cum in a jar, then its frozen until next time and so on, when there is enough in the jar, I thaw it out & fill up one of those large turkey baster/needles things.
I then let the slave pleasure himself... as he's about to cum, I shoot the baster full of his old cum up his bum.

LOL