It's extremely rare to find a completely unique plot line for anything anymore, but the key is taking cliches and twisting them to make them much less cliche-like and still use popular tropes woven into it.
Seriously though, Kouichi's first thought upon seeing the dick wasn't "Rape!" But "that's gonna tear me apart" lololol. Who do I have to pay to see those dicks uncensored. I need to see the size difference
You can't really judge it just from the first chap, but the idea in itself is good. A bit overused, but even the cliches can turn into masterpieces.
It's extremely rare to find a completely unique plot line for anything anymore, but the key is taking cliches and twisting them to make them much less cliche-like and still use popular tropes woven into it.