OO is something of a unicorn in the AVN environment. I'm not making the claim that it's perfect...there will certainly be players out there who don't find it to their taste...but I would put it's creative team up against anybody else out there, and I think if you play it, even if it doesn't satisfy all of your kinks, you may come away agreeing that it's something special.
The writing is incredibly assured. It's adult, and it brings the porn and erotic overtones, but it doesn't sacrifice character or style in this endeavor. It's not that it's entirely realistic, but that it's entirely driven by motives and personalities that pop off the screen and invest you in the action.
It is aided by meticulous artwork that enhances the story instead of being pulled along by it. Characters inhabit their space and they come to life in a fully constructed world. The artwork is gorgeous, and is often a treat to look at whether or not a buxom beauty happens to be on screen (which is thankfully often)
Both the plot and character arcs are meticulously paced. Indeed, the worst thing I can say about OO is that the wait between updates is tortuous, and would be whether it was 3 days or 3 months (most often the latter)
Please check this game out. It is worth your time and support, and I can only hope it draws similar talents to the AVN field.