One issue I have with eating my own cum is that I normally am shooting on my counter and then scooping it up. It already cools off in that case. This is brilliant, use your ass as a sperm-warmer! Love it.
This and ATM are the best reasons to make sure your hole is squeaky clean before bottoming. I'm not a fan of the taste of cum or piss but I'm in heaven when I'm lucky enough to find a master who wants to humiliate his faggot like this.