Anna is actually a cheating girlfriend. It has a slightly different dynamic, because she's not made any marriage vows. And in the office wife she's not technically cheating most of time, because her husband is mostly aware of what's going on, and supports her, albeit under the corrupting influence of her supernatural alter ego.
Having said that, I agree Anna is probably the best game in the cheating/corruption genre ( I'm biased though, because it's my favourite game). And I also really enjoy the Office Wife. The RPGM version can be a bit confusing at times, and involves quite a bit of grinding play, which is not to everyone's taste. But it has quite an original storyline, with the MC getting possessed by an ancient mesopotamian goddess. I can't really comment on Laura, because I haven't played it for a while. At some point the Dev made significant changes to the game, meaning old saves didn't work and you had to start again. And I never got around to it for some reason. But I probably will eventually, because that was fun as well.