I guess not everyone is equally “serious” when it comes to porn games. (In fact I’m sure there are more people who are serious about Tetris in general.)I newer understood why anyone would willingly play a serious game using anything but a PC. Some silly time waster like Tetris sure. Those don't really benefit from the extra visual fidelity, high resolution and overall quality improvement that a big HD monitor and the latest hardware can provide. But an actual game with actual art and plot and gameplay very much does. And this is doubly true for anything relating to porn for very obvious reasons.
So every time I hear about someone actually using android devices to play games all I can say is a confused "But why?"
Plot is the same whether you have it on a big screen or not.
As for gameplay, it really depends. Most VNs don’t have much to begin with—it really isn’t a huge loss in that department to play on mobile.
For graphics, the two games I do play on mobile are text-based, but actually my phone has a higher resolution than my monitor