Hmm, for straight up fapping, a flash game site like
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, or any of the dozens of others out, are still often hard to beat. The art quality is often mediocre, and there isn't much story to be had most of the time, but they often have a lot of gems in the rough. Most have some gimmick the game is focused on and they usually get right in to it. You can usually tell if it's going to be enjoyable, or at least to your taste, just by looking at the cover image for it. The fact that most are just a few minutes of content and you get a pretty decent variety of mechanics, kinks, and art styles make them pretty handy when looking for something you don't have to get too invested in.
As far as more full featured games,
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, is a game I've gone back to plenty of times to enjoy a quick scene or two. Especially for the girl with the glasses, she's my favorite by far. Then there's always
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, but I don't often end up jerking it over that, as I'm usually more caught up in taking in the content, but it does have some of the best designed Honey Select girls I've seen around making most of the renders pretty hot and worth going back to enjoy.