With the rise in popularity of mecha musume series like Frame Arms Girl, it wasn't long before ero version began to come out. Chinese copy began, but they were a bit crude, and honestly, it was the add-on part that was bad.
Enter Dark Advent series from Alphamax. Their first entry is this Dragondress Sophia and they didn't even try to hide that this is an adult version. They made it very clear from the beginning that the DX ver included adult parts.
