I feel like everything has been said already, but to me, the most anti-climatic tropes are:
- Badly written incest: MC's
momlandlady lusting for her son's cock after having seen a morning wood once. As Avaron said rightly, the woman has been jumping on dicks for years, there's no way she would hunger for her own son's noodle. MC'sauntneighbour being generally a depraved ex-model or ex-porn star that wants only one thing: teaching her nephew how to do the Moldavian wheelbarrow. Sex teacher = good, same old rehashed model milfy short-haired aunt = boring. And don't get me started with the MC'ssistersroommates. Fortunately, games like "My sister, my roommate" (yeah, if irony were chocolate, I'd be getting diabetes right now) play the trope right. - What really grind my gears, though, is the trope where sex just appears out of the blue: "Hello, I've just met you, and this is crazy, but here's my member, so suck me maybe". I mean, I understand that these game are porn related, but by jingo, can't we just have a little interaction to care about the lady? Games that put badly scripted unoriginal sex scenes without reason right at the beginning as a hook tend to end in the trash bin.
- Also, I don't know if it's really a porn game trope, but it might as well be: if engrish be to strnog, I generally don't bother. Lot of people here are not native English speakers, and that's alright, neither am I. But at least make an effort when releasing something that calls itself a "novel". This one is quite sad, because sometimes the renders are really neat in the preview, but everything is wasted on the first few lines.
- Which brings me to the last anti-climatic trope I can think of right now: unoriginal setting/scenario. Once again, I understand that we're not here to read the next *insert here a book you like*, but the same school settings, the same old scenario where you're playing a young student down on his luck, the same unoriginal ideas that make every game the copy of a copy of a copy of Big Brother... It gets tedious. Personally, when I play a visual fucking novel, I like to put emphasis on the "novel" part. It doesn't have to be perfect, but at least interesting characters and stakes are a minimum. Watching characters having sex when you're not involved at all, it does nothing to me.