Lots of cum

Ok, so as i imagine a few guys here enjoy anal masturbation. Now i want to see what it feels like to be filled up with sperm. Though i need quite a bit of it. So i was wondering; is it safe to use sperm that has been stored, how would i store it, or anything else that might help. Thanks in advance.

What you could do is store it in the freezer, then when you're ready, just thaw it out. I saw some videos a while back of a woman that froze her boyfriend/husband's cum and kept adding more loads every couple of days until there were about 20 in there, then she thawed it out and drank it and pretended like it was the cum from 20 different strangers. So I believe it's safe to do it like that.