Brother's Cum Overload

You approach your stressy sister to tell her that you have a problem with your orgasms. Your girlfriends keep leaving you, because they are frightened of the ungodly amount of cum you produce when you orgasm. You shoot enough to fill a whole pint glass, and you have no idea how or why it is happening! Your sister doesn’t believe you, and starts asking you all sorts of questions. You tell her that you can’t even wear a condom because you overfill it and they end up bursting, which is another reason girls don’t want to fuck you anymore… You are at a loss, so your sister decides to test you out for herself… Can any human produce that much cum?… She is going to find out!