I only glanced through a few key pages and didn't look up any kanji I didn't immediately recognize, so take this with a grain of salt, but the general plot seems to be the catboy and cat-dickgirl are both interested in the catgirl (or are they just actual cats being represented as people?), and egged on by her, they have a fuck battle with each other.
Make of that what you will, no guarantees on me being right, I've only glanced so far.