Bukkake

The otaku business mind has come up with the worlds first (probably) "liquid" proof manga...

The "liquid" in this case is specifically "your soldiers." The term Bukkake (ぶっかけ) originally means to dash or splash water/liquid onto something. Its still used for the naming of some Japanese dishes where a dollop of gooey stuff is dashed on top of noodles.

Through time however, Bukkake has gained the meaning of erm...squirting your soldiers onto a person/object.

You may recognize the artwork by Pink Chu Chu from the game Lyrical Lyric. Some limited copies of the game come with what the makers call "Bukkake Lyric" which is basically a liquid proof ero manga for you to do your daily business on.

This reminded me of the product Kokopyu where you can squirt your soldiers and view them through a magnifying glass.
If you could receive a free lifetime supply of either Kokopyu or Bukkake manga, which would you choose?